├── .gitignore
├── README.md
├── pom.xml
├── servlet-async-io
    ├── README.md
    ├── benchmark.jmx
    ├── pom.xml
    ├── src
    │   └── main
    │   │   ├── java
    │   │       └── me
    │   │       │   └── chanjar
    │   │       │       └── learning
    │   │       │           ├── AsyncReadServlet.java
    │   │       │           ├── AsyncWriteServlet.java
    │   │       │           └── Main.java
    │   │   └── resources
    │   │       └── bigfile
    └── user.properties
├── servlet-async-processing
    ├── README.md
    ├── benchmark.jmx
    ├── pom.xml
    └── src
    │   └── main
    │       └── java
    │           └── me
    │               └── chanjar
    │                   └── learning
    │                       ├── AsyncServlet1.java
    │                       ├── AsyncServlet2.java
    │                       ├── Main.java
    │                       ├── SlowJob.java
    │                       ├── SlowJobRunner.java
    │                       └── SyncServlet.java
├── spring-mvc-async-io
    ├── README.md
    ├── pom.xml
    └── src
    │   └── main
    │       ├── java
    │           └── me
    │           │   └── chanjar
    │           │       └── learning
    │           │           ├── Application.java
    │           │           ├── AsyncReadController.java
    │           │           ├── AsyncWriteController.java
    │           │           ├── CallableTraceController.java
    │           │           ├── config
    │           │               └── AsyncInterceptorConfiguration.java
    │           │           └── slowjob
    │           │               └── SlowJob.java
    │       └── resources
    │           └── application.properties
├── spring-mvc-async-processing
    ├── README.md
    ├── pom.xml
    └── src
    │   └── main
    │       └── java
    │           └── me
    │               └── chanjar
    │                   └── learning
    │                       ├── Application.java
    │                       ├── CallableController.java
    │                       ├── CompletionFutureController.java
    │                       ├── DeferredResultController.java
    │                       ├── ListenableFutureController.java
    │                       ├── ResponseBodyEmitterController.java
    │                       ├── SseEmitterController.java
    │                       ├── StreamingResponseBodyController.java
    │                       ├── config
    │                           ├── ExecutorServiceConfiguration.java
    │                           └── MvcAsyncTaskExecutorConfigurer.java
    │                       └── slowjob
    │                           └── SlowJob.java
└── tomcat-start
    ├── pom.xml
    └── src
        └── main
            └── java
                └── me
                    └── chanjar
                        └── learning
                            └── TomcatStart.java


/.gitignore:
--------------------------------------------------------------------------------
 1 | # Compiled class file
 2 | *.class
 3 | 
 4 | # Log file
 5 | *.log
 6 | 
 7 | # BlueJ files
 8 | *.ctxt
 9 | 
10 | # Mobile Tools for Java (J2ME)
11 | .mtj.tmp/
12 | 
13 | # Package Files #
14 | *.jar
15 | *.war
16 | *.ear
17 | *.zip
18 | *.tar.gz
19 | *.rar
20 | 
21 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
22 | hs_err_pid*
23 | 
24 | # Idea files
25 | *.iml
26 | .idea
27 | 
28 | # Eclipse files
29 | .project
30 | .classpath
31 | .settings
32 | 
33 | target
34 | rebel.xml
35 | jmeter.log


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # Web Async Learning
2 | 
3 | Java web开发async机制学习
4 | 
5 | 1. [Servlet 3.0 Async Processing](servlet-async-processing/README.md)
6 | 1. [Servlet 3.0 Async IO](servlet-async-io/README.md)
7 | 1. [Spring MVC Async Processing](spring-mvc-async-processing/README.md)
8 | 1. [Spring MVC Async IO](spring-mvc-async-io/README.md)
9 | 


--------------------------------------------------------------------------------
/pom.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3 |          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 4 |   <modelVersion>4.0.0</modelVersion>
 5 | 
 6 |   <groupId>me.chanjar.learning</groupId>
 7 |   <artifactId>web-async-learn-aggregator</artifactId>
 8 |   <version>1.0-SNAPSHOT</version>
 9 |   <packaging>pom</packaging>
10 | 
11 |   <properties>
12 |     <maven.compiler.source>1.8</maven.compiler.source>
13 |     <maven.compiler.target>1.8</maven.compiler.target>
14 |   </properties>
15 | 
16 |   <modules>
17 |     <module>tomcat-start</module>
18 |     <module>servlet-async-io</module>
19 |     <module>servlet-async-processing</module>
20 |     <module>spring-mvc-async-processing</module>
21 |     <module>spring-mvc-async-io</module>
22 |   </modules>
23 | 
24 |   <dependencyManagement>
25 |     <dependencies>
26 |       <dependency>
27 |         <groupId>javax.servlet</groupId>
28 |         <artifactId>javax.servlet-api</artifactId>
29 |         <version>3.1.0</version>
30 |       </dependency>
31 |       <dependency>
32 |         <groupId>org.apache.commons</groupId>
33 |         <artifactId>commons-lang3</artifactId>
34 |         <version>3.6</version>
35 |       </dependency>
36 |       <dependency>
37 |         <groupId>commons-io</groupId>
38 |         <artifactId>commons-io</artifactId>
39 |         <version>2.5</version>
40 |       </dependency>
41 |     </dependencies>
42 |   </dependencyManagement>
43 | </project>
44 | 


--------------------------------------------------------------------------------
/servlet-async-io/README.md:
--------------------------------------------------------------------------------
  1 | # Servlet 3.1 Async IO
  2 | 
  3 | Servlet Async Processing提供了一种异步请求处理的手段，能够让你将Http thread从慢速处理中释放出来出来其他请求，提高系统的响应度。
  4 | 
  5 | 但是光有Async Processing是不够的，因为整个请求-响应过程的速度快慢还牵涉到了客户端的网络情况，如果客户端网络情况糟糕，其上传和下载速度都很慢，那么同样也会长时间占用Http Thread使其不能被释放出来。
  6 | 
  7 | 于是Servlet 3.1提供了Async IO机制，使得从Request中读、往Response里写变成异步动作。
  8 | 
  9 | ## Async Read
 10 | 
 11 | 我们先来一段客户端上传速度慢的例子，[AsyncReadServlet.java][src-AsyncReadServlet]：
 12 | 
 13 | ```java
 14 | @WebServlet(value = "/async-read", asyncSupported = true)
 15 | public class AsyncReadServlet extends HttpServlet {
 16 | 
 17 |   @Override
 18 |   protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
 19 | 
 20 |     System.out.println("Servlet thread: " + Thread.currentThread().getName());
 21 |     AsyncContext asyncCtx = req.startAsync();
 22 |     ServletInputStream is = req.getInputStream();
 23 |     is.setReadListener(new ReadListener() {
 24 |       private int totalReadBytes = 0;
 25 | 
 26 |       @Override
 27 |       public void onDataAvailable() {
 28 |         System.out.println("ReadListener thread: " + Thread.currentThread().getName());
 29 | 
 30 |         try {
 31 |           byte buffer[] = new byte[1 * 1024];
 32 |           int readBytes = 0;
 33 |           while (is.isReady() && !is.isFinished()) {
 34 |             int length = is.read(buffer);
 35 |             if (length == -1 && is.isFinished()) {
 36 |               asyncCtx.complete();
 37 |               System.out.println("Read: " + readBytes + " bytes");
 38 |               System.out.println("Total Read: " + totalReadBytes + " bytes");
 39 |               return;
 40 |             }
 41 |             readBytes += length;
 42 |             totalReadBytes += length;
 43 | 
 44 |           }
 45 |           System.out.println("Read: " + readBytes + " bytes");
 46 | 
 47 |         } catch (IOException ex) {
 48 |           ex.printStackTrace();
 49 |           asyncCtx.complete();
 50 |         }
 51 |       }
 52 | 
 53 |       @Override
 54 |       public void onAllDataRead() {
 55 |         try {
 56 |           System.out.println("Total Read: " + totalReadBytes + " bytes");
 57 |           asyncCtx.getResponse().getWriter().println("Finished");
 58 |         } catch (IOException ex) {
 59 |           ex.printStackTrace();
 60 |         }
 61 |         asyncCtx.complete();
 62 |       }
 63 | 
 64 |       @Override
 65 |       public void onError(Throwable t) {
 66 |         System.out.println(ExceptionUtils.getStackTrace(t));
 67 |         asyncCtx.complete();
 68 |       }
 69 |     });
 70 | 
 71 |   }
 72 | 
 73 | }
 74 | ```
 75 | 
 76 | 我们利用`curl`的`--limit-rate`选项来模拟慢速上传``curl -X POST  -F "bigfile=@src/main/resources/bigfile" --limit-rate 5k http://localhost:8080/async-read``
 77 | 
 78 | 然后观察服务端的打印输出：
 79 | 
 80 | ```
 81 | Servlet thread: http-nio-8080-exec-3
 82 | ReadListener thread: http-nio-8080-exec-3
 83 | Read: 16538 bytes
 84 | ReadListener thread: http-nio-8080-exec-4
 85 | Read: 16384 bytes
 86 | ReadListener thread: http-nio-8080-exec-5
 87 | Read: 16384 bytes
 88 | ReadListener thread: http-nio-8080-exec-7
 89 | Read: 16384 bytes
 90 | ReadListener thread: http-nio-8080-exec-6
 91 | Read: 16384 bytes
 92 | ReadListener thread: http-nio-8080-exec-8
 93 | Read: 16384 bytes
 94 | ReadListener thread: http-nio-8080-exec-9
 95 | Read: 16384 bytes
 96 | ReadListener thread: http-nio-8080-exec-10
 97 | Read: 2312 bytes
 98 | ReadListener thread: http-nio-8080-exec-1
 99 | Read: 48 bytes
100 | Total Read: 117202 bytes
101 | ```
102 | 
103 | 可以从输出看到除了doGet和第一次进入onDataAvailable是同一个Http thread之外，后面的read动作都发生在另外的Http thread里。
104 | 这是因为客户端的数据推送速度太慢了，容器先将Http thread收回，当容器发现可以读取到新数据的时候，再分配一个Http thread去读InputStream，如此循环直到全部读完为止。
105 | 
106 | 注意：`HttpServletRequest.getInputStream()`和`getParameter*()`不能同时使用。
107 | 
108 | ## Async Write
109 | 
110 | 再来一段客户端下载慢的例子，[AsyncWriteServlet.java][src-AsyncWriteServlet]：
111 | 
112 | ```java
113 | @WebServlet(value = "/async-write", asyncSupported = true)
114 | public class AsyncWriteServlet extends HttpServlet {
115 | 
116 |   @Override
117 |   protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
118 | 
119 |     System.out.println("Servlet thread: " + Thread.currentThread().getName());
120 |     AsyncContext asyncCtx = req.startAsync();
121 |     ServletOutputStream os = resp.getOutputStream();
122 |     InputStream bigfileInputStream = ClassLoader.getSystemClassLoader().getResourceAsStream("bigfile");
123 | 
124 |     os.setWriteListener(new WriteListener() {
125 | 
126 |       @Override
127 |       public void onWritePossible() throws IOException {
128 | 
129 |         int loopCount = 0;
130 |         System.out.println("WriteListener thread: " + Thread.currentThread().getName());
131 |         while (os.isReady()) {
132 |           loopCount++;
133 |           System.out.println("Loop Count: " + loopCount);
134 |           byte[] bytes = readContent();
135 |           if (bytes != null) {
136 |             os.write(bytes);
137 |           } else {
138 |             closeInputStream();
139 |             asyncCtx.complete();
140 |             break;
141 |           }
142 |         }
143 |       }
144 | 
145 |       @Override
146 |       public void onError(Throwable t) {
147 | 
148 |         try {
149 |           os.print("Error happened");
150 |           os.print(ExceptionUtils.getStackTrace(t));
151 |         } catch (IOException e) {
152 |           e.printStackTrace();
153 |         } finally {
154 |           closeInputStream();
155 |           asyncCtx.complete();
156 |         }
157 | 
158 |       }
159 | 
160 |       private byte[] readContent() throws IOException {
161 |         byte[] bytes = new byte[1024];
162 |         int readLength = IOUtils.read(bigfileInputStream, bytes);
163 |         if (readLength <= 0) {
164 |           return null;
165 |         }
166 |         return bytes;
167 |       }
168 | 
169 |       private void closeInputStream() {
170 |         IOUtils.closeQuietly(bigfileInputStream);
171 |       }
172 |     });
173 | 
174 |   }
175 | 
176 | }
177 | ```
178 | 
179 | 同样利用`curl`做慢速下载，``curl --limit-rate 5k http://localhost:8080/async-write``
180 | 
181 | 接下来看以下服务端打印输出：
182 | 
183 | ```
184 | Servlet thread: http-nio-8080-exec-1
185 | WriteListener thread: http-nio-8080-exec-1
186 | Write bytes: 8192
187 | WriteListener thread: http-nio-8080-exec-2
188 | Write bytes: 8192
189 | WriteListener thread: http-nio-8080-exec-3
190 | Write bytes: 8192
191 | WriteListener thread: http-nio-8080-exec-4
192 | Write bytes: 8192
193 | WriteListener thread: http-nio-8080-exec-5
194 | Write bytes: 8192
195 | WriteListener thread: http-nio-8080-exec-6
196 | Write bytes: 8192
197 | WriteListener thread: http-nio-8080-exec-7
198 | Write bytes: 8192
199 | WriteListener thread: http-nio-8080-exec-8
200 | Write bytes: 8192
201 | WriteListener thread: http-nio-8080-exec-9
202 | Write bytes: 8192
203 | WriteListener thread: http-nio-8080-exec-10
204 | Write bytes: 8192
205 | WriteListener thread: http-nio-8080-exec-1
206 | Write bytes: 8192
207 | WriteListener thread: http-nio-8080-exec-2
208 | Write bytes: 8192
209 | WriteListener thread: http-nio-8080-exec-3
210 | Write bytes: 8192
211 | WriteListener thread: http-nio-8080-exec-4
212 | Write bytes: 8192
213 | WriteListener thread: http-nio-8080-exec-5
214 | Write bytes: 2312
215 | ```
216 | 
217 | PS. 后发现即使没有添加`--limit-rate`参数，也会出现类似于上面的结果。
218 | 
219 | ## Jmeter
220 | 
221 | 上面两个例子使用的是`curl`来模拟，我们也提供了Jmeter的benchmark。
222 | 
223 | 需要注意的是，必须在user.properties文件所在目录启动Jmeter，因为这个文件里提供了模拟慢速连接的参数`httpclient.socket.http.cps=5120`。然后利用Jmeter打开benchmark.xml。
224 | 
225 | 
226 | ## 相关资料
227 | 
228 | * [Java EE 7 Tutorial: Java Servlet Technology - Nonblocking I/O][ref-1]
229 | * [Slides - Servlet 3.1 Async IO][ref-2]
230 | * [Non-blocking I/O using Servlet 3.1: Scalable applications using Java EE 7][ref-3]
231 | * [How to simulate network bandwidth in JMeter?][ref-4]
232 | * [Configuring JMeter][ref-5]
233 | * [Servlet 3.1 Asynchronous IO and Jetty-9.1][ref-6]
234 | 
235 |   [ref-1]: https://docs.oracle.com/javaee/7/tutorial/servlets013.htm
236 |   [ref-2]: https://www.slideshare.net/SimoneBordet/servlet-31-async-io
237 |   [ref-3]: https://blogs.oracle.com/arungupta/non-blocking-io-using-servlet-31:-scalable-applications-using-java-ee-7-totd-188
238 |   [ref-4]: https://wiki.apache.org/jmeter/Controlling%20Bandwidth%20in%20JMeter%20to%20simulate%20different%20networks
239 |   [ref-5]: http://jmeter.apache.org/usermanual/get-started.html#configuring_jmeter
240 |   [ref-6]: https://webtide.com/servlet-3-1-async-io-and-jetty/
241 |   [src-AsyncReadServlet]:  src/main/java/me/chanjar/learning/AsyncReadServlet.java
242 |   [src-AsyncWriteServlet]: src/main/java/me/chanjar/learning/AsyncWriteServlet.java
243 | 


--------------------------------------------------------------------------------
/servlet-async-io/benchmark.jmx:
--------------------------------------------------------------------------------
  1 | <?xml version="1.0" encoding="UTF-8"?>
  2 | <jmeterTestPlan version="1.2" properties="3.1" jmeter="3.1 r1770033">
  3 |   <hashTree>
  4 |     <TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="测试计划" enabled="true">
  5 |       <stringProp name="TestPlan.comments"></stringProp>
  6 |       <boolProp name="TestPlan.functional_mode">false</boolProp>
  7 |       <boolProp name="TestPlan.serialize_threadgroups">true</boolProp>
  8 |       <elementProp name="TestPlan.user_defined_variables" elementType="Arguments" guiclass="ArgumentsPanel" testclass="Arguments" testname="用户定义的变量" enabled="true">
  9 |         <collectionProp name="Arguments.arguments">
 10 |           <elementProp name="iteration" elementType="Argument">
 11 |             <stringProp name="Argument.name">iteration</stringProp>
 12 |             <stringProp name="Argument.value">3</stringProp>
 13 |             <stringProp name="Argument.metadata">=</stringProp>
 14 |           </elementProp>
 15 |           <elementProp name="users" elementType="Argument">
 16 |             <stringProp name="Argument.name">users</stringProp>
 17 |             <stringProp name="Argument.value">400</stringProp>
 18 |             <stringProp name="Argument.metadata">=</stringProp>
 19 |           </elementProp>
 20 |           <elementProp name="rampup" elementType="Argument">
 21 |             <stringProp name="Argument.name">rampup</stringProp>
 22 |             <stringProp name="Argument.value">0</stringProp>
 23 |             <stringProp name="Argument.metadata">=</stringProp>
 24 |           </elementProp>
 25 |         </collectionProp>
 26 |       </elementProp>
 27 |       <stringProp name="TestPlan.user_define_classpath"></stringProp>
 28 |       <boolProp name="TestPlan.tearDown_on_shutdown">true</boolProp>
 29 |     </TestPlan>
 30 |     <hashTree>
 31 |       <ConfigTestElement guiclass="HttpDefaultsGui" testclass="ConfigTestElement" testname="HTTP Request Defaults" enabled="true">
 32 |         <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
 33 |           <collectionProp name="Arguments.arguments"/>
 34 |         </elementProp>
 35 |         <stringProp name="HTTPSampler.domain">localhost</stringProp>
 36 |         <stringProp name="HTTPSampler.port">8080</stringProp>
 37 |         <stringProp name="HTTPSampler.connect_timeout"></stringProp>
 38 |         <stringProp name="HTTPSampler.response_timeout"></stringProp>
 39 |         <stringProp name="HTTPSampler.protocol"></stringProp>
 40 |         <stringProp name="HTTPSampler.contentEncoding"></stringProp>
 41 |         <stringProp name="HTTPSampler.path"></stringProp>
 42 |         <stringProp name="HTTPSampler.implementation">HttpClient4</stringProp>
 43 |         <stringProp name="HTTPSampler.concurrentPool">6</stringProp>
 44 |       </ConfigTestElement>
 45 |       <hashTree/>
 46 |       <ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="async-read" enabled="true">
 47 |         <stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
 48 |         <elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller" enabled="true">
 49 |           <boolProp name="LoopController.continue_forever">false</boolProp>
 50 |           <stringProp name="LoopController.loops">${iteration}</stringProp>
 51 |         </elementProp>
 52 |         <stringProp name="ThreadGroup.num_threads">${users}</stringProp>
 53 |         <stringProp name="ThreadGroup.ramp_time">${rampup}</stringProp>
 54 |         <longProp name="ThreadGroup.start_time">1512530334000</longProp>
 55 |         <longProp name="ThreadGroup.end_time">1512530334000</longProp>
 56 |         <boolProp name="ThreadGroup.scheduler">false</boolProp>
 57 |         <stringProp name="ThreadGroup.duration"></stringProp>
 58 |         <stringProp name="ThreadGroup.delay"></stringProp>
 59 |         <boolProp name="ThreadGroup.delayedStart">true</boolProp>
 60 |       </ThreadGroup>
 61 |       <hashTree>
 62 |         <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="async-read" enabled="true">
 63 |           <elementProp name="HTTPsampler.Files" elementType="HTTPFileArgs">
 64 |             <collectionProp name="HTTPFileArgs.files">
 65 |               <elementProp name="src/main/resources/bigfile" elementType="HTTPFileArg">
 66 |                 <stringProp name="File.path">src/main/resources/bigfile</stringProp>
 67 |                 <stringProp name="File.paramname">bigfile</stringProp>
 68 |                 <stringProp name="File.mimetype">plain/text</stringProp>
 69 |               </elementProp>
 70 |             </collectionProp>
 71 |           </elementProp>
 72 |           <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
 73 |             <collectionProp name="Arguments.arguments"/>
 74 |           </elementProp>
 75 |           <stringProp name="HTTPSampler.domain"></stringProp>
 76 |           <stringProp name="HTTPSampler.port"></stringProp>
 77 |           <stringProp name="HTTPSampler.connect_timeout"></stringProp>
 78 |           <stringProp name="HTTPSampler.response_timeout"></stringProp>
 79 |           <stringProp name="HTTPSampler.protocol"></stringProp>
 80 |           <stringProp name="HTTPSampler.contentEncoding"></stringProp>
 81 |           <stringProp name="HTTPSampler.path">/async-read</stringProp>
 82 |           <stringProp name="HTTPSampler.method">POST</stringProp>
 83 |           <boolProp name="HTTPSampler.follow_redirects">true</boolProp>
 84 |           <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
 85 |           <boolProp name="HTTPSampler.use_keepalive">true</boolProp>
 86 |           <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
 87 |           <boolProp name="HTTPSampler.monitor">false</boolProp>
 88 |           <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
 89 |         </HTTPSamplerProxy>
 90 |         <hashTree/>
 91 |       </hashTree>
 92 |       <ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="async-write" enabled="true">
 93 |         <stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
 94 |         <elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller" enabled="true">
 95 |           <boolProp name="LoopController.continue_forever">false</boolProp>
 96 |           <stringProp name="LoopController.loops">${iteration}</stringProp>
 97 |         </elementProp>
 98 |         <stringProp name="ThreadGroup.num_threads">${users}</stringProp>
 99 |         <stringProp name="ThreadGroup.ramp_time">${rampup}</stringProp>
100 |         <longProp name="ThreadGroup.start_time">1512530334000</longProp>
101 |         <longProp name="ThreadGroup.end_time">1512530334000</longProp>
102 |         <boolProp name="ThreadGroup.scheduler">false</boolProp>
103 |         <stringProp name="ThreadGroup.duration"></stringProp>
104 |         <stringProp name="ThreadGroup.delay"></stringProp>
105 |         <boolProp name="ThreadGroup.delayedStart">true</boolProp>
106 |       </ThreadGroup>
107 |       <hashTree>
108 |         <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="async-write" enabled="true">
109 |           <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
110 |             <collectionProp name="Arguments.arguments"/>
111 |           </elementProp>
112 |           <stringProp name="HTTPSampler.domain"></stringProp>
113 |           <stringProp name="HTTPSampler.port"></stringProp>
114 |           <stringProp name="HTTPSampler.connect_timeout"></stringProp>
115 |           <stringProp name="HTTPSampler.response_timeout"></stringProp>
116 |           <stringProp name="HTTPSampler.protocol"></stringProp>
117 |           <stringProp name="HTTPSampler.contentEncoding"></stringProp>
118 |           <stringProp name="HTTPSampler.path">/async-write</stringProp>
119 |           <stringProp name="HTTPSampler.method">GET</stringProp>
120 |           <boolProp name="HTTPSampler.follow_redirects">true</boolProp>
121 |           <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
122 |           <boolProp name="HTTPSampler.use_keepalive">true</boolProp>
123 |           <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
124 |           <boolProp name="HTTPSampler.monitor">false</boolProp>
125 |           <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
126 |         </HTTPSamplerProxy>
127 |         <hashTree/>
128 |       </hashTree>
129 |       <ResultCollector guiclass="StatGraphVisualizer" testclass="ResultCollector" testname="Aggregate Graph" enabled="true">
130 |         <boolProp name="ResultCollector.error_logging">false</boolProp>
131 |         <objProp>
132 |           <name>saveConfig</name>
133 |           <value class="SampleSaveConfiguration">
134 |             <time>true</time>
135 |             <latency>true</latency>
136 |             <timestamp>true</timestamp>
137 |             <success>true</success>
138 |             <label>true</label>
139 |             <code>true</code>
140 |             <message>true</message>
141 |             <threadName>true</threadName>
142 |             <dataType>true</dataType>
143 |             <encoding>false</encoding>
144 |             <assertions>true</assertions>
145 |             <subresults>true</subresults>
146 |             <responseData>false</responseData>
147 |             <samplerData>false</samplerData>
148 |             <xml>false</xml>
149 |             <fieldNames>true</fieldNames>
150 |             <responseHeaders>false</responseHeaders>
151 |             <requestHeaders>false</requestHeaders>
152 |             <responseDataOnError>false</responseDataOnError>
153 |             <saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
154 |             <assertionsResultsToSave>0</assertionsResultsToSave>
155 |             <bytes>true</bytes>
156 |             <sentBytes>true</sentBytes>
157 |             <threadCounts>true</threadCounts>
158 |             <idleTime>true</idleTime>
159 |             <connectTime>true</connectTime>
160 |           </value>
161 |         </objProp>
162 |         <stringProp name="filename"></stringProp>
163 |       </ResultCollector>
164 |       <hashTree/>
165 |       <ResultCollector guiclass="ViewResultsFullVisualizer" testclass="ResultCollector" testname="View Results Tree" enabled="true">
166 |         <boolProp name="ResultCollector.error_logging">true</boolProp>
167 |         <objProp>
168 |           <name>saveConfig</name>
169 |           <value class="SampleSaveConfiguration">
170 |             <time>true</time>
171 |             <latency>true</latency>
172 |             <timestamp>true</timestamp>
173 |             <success>true</success>
174 |             <label>true</label>
175 |             <code>true</code>
176 |             <message>true</message>
177 |             <threadName>true</threadName>
178 |             <dataType>true</dataType>
179 |             <encoding>false</encoding>
180 |             <assertions>true</assertions>
181 |             <subresults>true</subresults>
182 |             <responseData>false</responseData>
183 |             <samplerData>false</samplerData>
184 |             <xml>false</xml>
185 |             <fieldNames>true</fieldNames>
186 |             <responseHeaders>false</responseHeaders>
187 |             <requestHeaders>false</requestHeaders>
188 |             <responseDataOnError>false</responseDataOnError>
189 |             <saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
190 |             <assertionsResultsToSave>0</assertionsResultsToSave>
191 |             <bytes>true</bytes>
192 |             <sentBytes>true</sentBytes>
193 |             <threadCounts>true</threadCounts>
194 |             <idleTime>true</idleTime>
195 |             <connectTime>true</connectTime>
196 |           </value>
197 |         </objProp>
198 |         <stringProp name="filename"></stringProp>
199 |       </ResultCollector>
200 |       <hashTree/>
201 |       <kg.apc.jmeter.vizualizers.CorrectedResultCollector guiclass="kg.apc.jmeter.vizualizers.ResponseTimesOverTimeGui" testclass="kg.apc.jmeter.vizualizers.CorrectedResultCollector" testname="Response Times Over Time" enabled="true">
202 |         <boolProp name="ResultCollector.error_logging">false</boolProp>
203 |         <objProp>
204 |           <name>saveConfig</name>
205 |           <value class="SampleSaveConfiguration">
206 |             <time>true</time>
207 |             <latency>true</latency>
208 |             <timestamp>true</timestamp>
209 |             <success>true</success>
210 |             <label>true</label>
211 |             <code>true</code>
212 |             <message>true</message>
213 |             <threadName>true</threadName>
214 |             <dataType>true</dataType>
215 |             <encoding>false</encoding>
216 |             <assertions>true</assertions>
217 |             <subresults>true</subresults>
218 |             <responseData>false</responseData>
219 |             <samplerData>false</samplerData>
220 |             <xml>false</xml>
221 |             <fieldNames>true</fieldNames>
222 |             <responseHeaders>false</responseHeaders>
223 |             <requestHeaders>false</requestHeaders>
224 |             <responseDataOnError>false</responseDataOnError>
225 |             <saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
226 |             <assertionsResultsToSave>0</assertionsResultsToSave>
227 |             <bytes>true</bytes>
228 |             <sentBytes>true</sentBytes>
229 |             <threadCounts>true</threadCounts>
230 |             <idleTime>true</idleTime>
231 |             <connectTime>true</connectTime>
232 |           </value>
233 |         </objProp>
234 |         <stringProp name="filename"></stringProp>
235 |         <longProp name="interval_grouping">500</longProp>
236 |         <boolProp name="graph_aggregated">false</boolProp>
237 |         <stringProp name="include_sample_labels"></stringProp>
238 |         <stringProp name="exclude_sample_labels"></stringProp>
239 |         <stringProp name="start_offset"></stringProp>
240 |         <stringProp name="end_offset"></stringProp>
241 |         <boolProp name="include_checkbox_state">false</boolProp>
242 |         <boolProp name="exclude_checkbox_state">false</boolProp>
243 |         <boolProp name="ResultCollector.success_only_logging">true</boolProp>
244 |       </kg.apc.jmeter.vizualizers.CorrectedResultCollector>
245 |       <hashTree/>
246 |       <kg.apc.jmeter.vizualizers.CorrectedResultCollector guiclass="kg.apc.jmeter.vizualizers.TransactionsPerSecondGui" testclass="kg.apc.jmeter.vizualizers.CorrectedResultCollector" testname="Transactions per Second" enabled="true">
247 |         <boolProp name="ResultCollector.error_logging">false</boolProp>
248 |         <objProp>
249 |           <name>saveConfig</name>
250 |           <value class="SampleSaveConfiguration">
251 |             <time>true</time>
252 |             <latency>true</latency>
253 |             <timestamp>true</timestamp>
254 |             <success>true</success>
255 |             <label>true</label>
256 |             <code>true</code>
257 |             <message>true</message>
258 |             <threadName>true</threadName>
259 |             <dataType>true</dataType>
260 |             <encoding>false</encoding>
261 |             <assertions>true</assertions>
262 |             <subresults>true</subresults>
263 |             <responseData>false</responseData>
264 |             <samplerData>false</samplerData>
265 |             <xml>false</xml>
266 |             <fieldNames>true</fieldNames>
267 |             <responseHeaders>false</responseHeaders>
268 |             <requestHeaders>false</requestHeaders>
269 |             <responseDataOnError>false</responseDataOnError>
270 |             <saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
271 |             <assertionsResultsToSave>0</assertionsResultsToSave>
272 |             <bytes>true</bytes>
273 |             <sentBytes>true</sentBytes>
274 |             <threadCounts>true</threadCounts>
275 |             <idleTime>true</idleTime>
276 |             <connectTime>true</connectTime>
277 |           </value>
278 |         </objProp>
279 |         <stringProp name="filename"></stringProp>
280 |         <longProp name="interval_grouping">1000</longProp>
281 |         <boolProp name="graph_aggregated">false</boolProp>
282 |         <stringProp name="include_sample_labels"></stringProp>
283 |         <stringProp name="exclude_sample_labels"></stringProp>
284 |         <stringProp name="start_offset"></stringProp>
285 |         <stringProp name="end_offset"></stringProp>
286 |         <boolProp name="include_checkbox_state">false</boolProp>
287 |         <boolProp name="exclude_checkbox_state">false</boolProp>
288 |         <boolProp name="ResultCollector.success_only_logging">true</boolProp>
289 |       </kg.apc.jmeter.vizualizers.CorrectedResultCollector>
290 |       <hashTree/>
291 |     </hashTree>
292 |   </hashTree>
293 | </jmeterTestPlan>
294 | 


--------------------------------------------------------------------------------
/servlet-async-io/pom.xml:
--------------------------------------------------------------------------------
 1 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2 |          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 3 |   <modelVersion>4.0.0</modelVersion>
 4 | 
 5 |   <parent>
 6 |     <groupId>me.chanjar.learning</groupId>
 7 |     <artifactId>web-async-learn-aggregator</artifactId>
 8 |     <version>1.0-SNAPSHOT</version>
 9 |   </parent>
10 | 
11 |   <groupId>me.chanjar.learning</groupId>
12 |   <artifactId>servlet-async-io</artifactId>
13 |   <packaging>war</packaging>
14 | 
15 |   <dependencies>
16 | 
17 | 
18 |     <dependency>
19 |       <groupId>me.chanjar.learning</groupId>
20 |       <artifactId>tomcat-start</artifactId>
21 |       <version>${project.version}</version>
22 |     </dependency>
23 | 
24 |     <dependency>
25 |       <groupId>javax.servlet</groupId>
26 |       <artifactId>javax.servlet-api</artifactId>
27 |       <scope>runtime</scope>
28 |     </dependency>
29 | 
30 |     <dependency>
31 |       <groupId>org.apache.commons</groupId>
32 |       <artifactId>commons-lang3</artifactId>
33 |     </dependency>
34 | 
35 |     <dependency>
36 |       <groupId>commons-io</groupId>
37 |       <artifactId>commons-io</artifactId>
38 |     </dependency>
39 | 
40 |     <dependency>
41 |       <groupId>junit</groupId>
42 |       <artifactId>junit</artifactId>
43 |       <version>3.8.1</version>
44 |       <scope>test</scope>
45 |     </dependency>
46 |   </dependencies>
47 | </project>
48 | 


--------------------------------------------------------------------------------
/servlet-async-io/src/main/java/me/chanjar/learning/AsyncReadServlet.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import org.apache.commons.lang3.exception.ExceptionUtils;
 4 | 
 5 | import javax.servlet.AsyncContext;
 6 | import javax.servlet.ReadListener;
 7 | import javax.servlet.ServletException;
 8 | import javax.servlet.ServletInputStream;
 9 | import javax.servlet.annotation.WebServlet;
10 | import javax.servlet.http.HttpServlet;
11 | import javax.servlet.http.HttpServletRequest;
12 | import javax.servlet.http.HttpServletResponse;
13 | import java.io.IOException;
14 | 
15 | @WebServlet(value = "/async-read", asyncSupported = true)
16 | public class AsyncReadServlet extends HttpServlet {
17 | 
18 |   @Override
19 |   protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
20 | 
21 |     System.out.println("Servlet thread: " + Thread.currentThread().getName());
22 |     AsyncContext asyncCtx = req.startAsync();
23 |     ServletInputStream is = req.getInputStream();
24 |     is.setReadListener(new ReadListener() {
25 |       private int totalReadBytes = 0;
26 | 
27 |       @Override
28 |       public void onDataAvailable() {
29 |         System.out.println("ReadListener thread: " + Thread.currentThread().getName());
30 | 
31 |         try {
32 |           byte buffer[] = new byte[1 * 1024];
33 |           int readBytes = 0;
34 |           while (is.isReady() && !is.isFinished()) {
35 |             int length = is.read(buffer);
36 |             if (length == -1 && is.isFinished()) {
37 |               asyncCtx.complete();
38 |               System.out.println("Read: " + readBytes + " bytes");
39 |               System.out.println("Total Read: " + totalReadBytes + " bytes");
40 |               return;
41 |             }
42 |             readBytes += length;
43 |             totalReadBytes += length;
44 | 
45 |           }
46 |           System.out.println("Read: " + readBytes + " bytes");
47 | 
48 |         } catch (IOException ex) {
49 |           ex.printStackTrace();
50 |           asyncCtx.complete();
51 |         }
52 |       }
53 | 
54 |       @Override
55 |       public void onAllDataRead() {
56 |         try {
57 |           System.out.println("Total Read: " + totalReadBytes + " bytes");
58 |           asyncCtx.getResponse().getWriter().println("Finished");
59 |         } catch (IOException ex) {
60 |           ex.printStackTrace();
61 |         }
62 |         asyncCtx.complete();
63 |       }
64 | 
65 |       @Override
66 |       public void onError(Throwable t) {
67 |         System.out.println(ExceptionUtils.getStackTrace(t));
68 |         asyncCtx.complete();
69 |       }
70 |     });
71 | 
72 |   }
73 | 
74 | }
75 | 


--------------------------------------------------------------------------------
/servlet-async-io/src/main/java/me/chanjar/learning/AsyncWriteServlet.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import org.apache.commons.io.IOUtils;
 4 | import org.apache.commons.lang3.exception.ExceptionUtils;
 5 | 
 6 | import javax.servlet.AsyncContext;
 7 | import javax.servlet.ServletException;
 8 | import javax.servlet.ServletOutputStream;
 9 | import javax.servlet.WriteListener;
10 | import javax.servlet.annotation.WebServlet;
11 | import javax.servlet.http.HttpServlet;
12 | import javax.servlet.http.HttpServletRequest;
13 | import javax.servlet.http.HttpServletResponse;
14 | import java.io.IOException;
15 | import java.io.InputStream;
16 | 
17 | @WebServlet(value = "/async-write", asyncSupported = true)
18 | public class AsyncWriteServlet extends HttpServlet {
19 | 
20 |   @Override
21 |   protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
22 | 
23 |     System.out.println("Servlet thread: " + Thread.currentThread().getName());
24 |     AsyncContext asyncCtx = req.startAsync();
25 |     ServletOutputStream os = resp.getOutputStream();
26 |     InputStream bigfileInputStream = ClassLoader.getSystemClassLoader().getResourceAsStream("bigfile");
27 | 
28 |     os.setWriteListener(new WriteListener() {
29 | 
30 |       @Override
31 |       public void onWritePossible() throws IOException {
32 | 
33 |         int writeBytes = 0;
34 |         System.out.println("WriteListener thread: " + Thread.currentThread().getName());
35 |         while (os.isReady()) {
36 |           byte[] bytes = new byte[1024];
37 |           int readBytes = readContent(bytes);
38 |           if (readBytes > 0) {
39 |             os.write(bytes);
40 |             writeBytes += readBytes;
41 |           } else {
42 |             closeInputStream();
43 |             asyncCtx.complete();
44 |             break;
45 |           }
46 |         }
47 |         System.out.println("Write bytes: " + writeBytes);
48 | 
49 |       }
50 | 
51 |       @Override
52 |       public void onError(Throwable t) {
53 | 
54 |         try {
55 |           os.print("Error happened");
56 |           os.print(ExceptionUtils.getStackTrace(t));
57 |         } catch (IOException e) {
58 |           e.printStackTrace();
59 |         } finally {
60 |           closeInputStream();
61 |           asyncCtx.complete();
62 |         }
63 | 
64 |       }
65 | 
66 |       private int readContent(byte[] buffer) throws IOException {
67 |         int readLength = IOUtils.read(bigfileInputStream, buffer);
68 |         return readLength;
69 |       }
70 | 
71 |       private void closeInputStream() {
72 |         IOUtils.closeQuietly(bigfileInputStream);
73 |       }
74 |     });
75 | 
76 |   }
77 | 
78 | }
79 | 


--------------------------------------------------------------------------------
/servlet-async-io/src/main/java/me/chanjar/learning/Main.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | public class Main {
 4 | 
 5 |   public static void main(String[] args) throws Exception {
 6 | 
 7 |     TomcatStart.start();
 8 | 
 9 |   }
10 | 
11 | }
12 | 


--------------------------------------------------------------------------------
/servlet-async-io/src/main/resources/bigfile:
--------------------------------------------------------------------------------
   1 | 00001: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
   2 | 00002: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
   3 | 00003: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
   4 | 00004: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
   5 | 00005: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
   6 | 00006: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
   7 | 00007: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
   8 | 00008: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
   9 | 00009: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  10 | 00010: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  11 | 00011: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  12 | 00012: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  13 | 00013: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  14 | 00014: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  15 | 00015: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  16 | 00016: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  17 | 00017: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  18 | 00018: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  19 | 00019: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  20 | 00020: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  21 | 00021: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  22 | 00022: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  23 | 00023: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  24 | 00024: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  25 | 00025: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  26 | 00026: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  27 | 00027: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  28 | 00028: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  29 | 00029: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  30 | 00030: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  31 | 00031: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  32 | 00032: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  33 | 00033: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  34 | 00034: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  35 | 00035: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  36 | 00036: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  37 | 00037: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  38 | 00038: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  39 | 00039: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  40 | 00040: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  41 | 00041: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  42 | 00042: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  43 | 00043: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  44 | 00044: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  45 | 00045: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  46 | 00046: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  47 | 00047: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  48 | 00048: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  49 | 00049: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  50 | 00050: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  51 | 00051: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  52 | 00052: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  53 | 00053: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  54 | 00054: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  55 | 00055: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  56 | 00056: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  57 | 00057: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  58 | 00058: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  59 | 00059: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  60 | 00060: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  61 | 00061: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  62 | 00062: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  63 | 00063: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  64 | 00064: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  65 | 00065: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  66 | 00066: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  67 | 00067: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  68 | 00068: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  69 | 00069: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  70 | 00070: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  71 | 00071: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  72 | 00072: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  73 | 00073: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  74 | 00074: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  75 | 00075: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  76 | 00076: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  77 | 00077: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
  78 | 00078: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
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 956 | 00956: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 957 | 00957: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
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 964 | 00964: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 965 | 00965: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
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 975 | 00975: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 976 | 00976: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 977 | 00977: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 978 | 00978: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 979 | 00979: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 980 | 00980: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 981 | 00981: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 982 | 00982: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 983 | 00983: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 984 | 00984: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 985 | 00985: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 986 | 00986: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 987 | 00987: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 988 | 00988: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 989 | 00989: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 990 | 00990: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 991 | 00991: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 992 | 00992: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 993 | 00993: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 994 | 00994: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 995 | 00995: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 996 | 00996: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 997 | 00997: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 998 | 00998: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
 999 | 00999: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
1000 | 01000: 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789
1001 | 


--------------------------------------------------------------------------------
/servlet-async-io/user.properties:
--------------------------------------------------------------------------------
1 | # Define characters per second > 0 to emulate slow connections
2 | httpclient.socket.http.cps=5120
3 | 


--------------------------------------------------------------------------------
/servlet-async-processing/README.md:
--------------------------------------------------------------------------------
  1 | # Servlet 3.0 Async Processing
  2 | 
  3 | Servlet 3.0 开始提供了AsyncContext用来支持异步处理请求，那么异步处理请求到底能够带来哪些好处？
  4 | 
  5 | Web容器一般来说处理请求的方式是：为每个request分配一个thread。我们都知道thread的创建不是没有代价的，Web容器的thread pool都是有上限的。
  6 | 那么一个很容易预见的问题就是，在高负载情况下，thread pool都被占着了，那么后续的request就只能等待，如果运气不好客户端会报等待超时的错误。
  7 | 在AsyncContext出现之前，解决这个问题的唯一办法就是扩充Web容器的thread pool。
  8 | 
  9 | 但是这样依然有一个问题，考虑以下场景：
 10 | 
 11 | 有一个web容器，线程池大小200。有一个web app，它有两个servlet，Servlet-A处理单个请求的时间是10s，Servlet-B处理单个请求的时间是1s。
 12 | 现在遇到了高负载，有超过200个request到Servlet-A，如果这个时候请求Servlet-B就会等待，因为所有HTTP thread都已经被Servlet-A占用了。
 13 | 这个时候工程师发现了问题，扩展了线程池大小到400，但是负载依然持续走高，现在有400个request到Servlet-A，Servlet-B依然无法响应。
 14 | 
 15 | 看到问题了没有，因为**HTTP thread和Worker thread耦合在了一起（就是同一个thread）**，所以导致了当大量request到一个耗时操作时，就会将HTTP thread占满，导致整个Web容器就会无法响应。
 16 | 
 17 | 但是如果使用AsyncContext，我们就可以将耗时的操作交给另一个thread去做，这样HTTP thread就被释放出来了，可以去处理其他请求了。
 18 | 
 19 | > 注意，只有使用AsyncContext才能够达到上面所讲的效果，如果直接new Thread()或者类似的方式的，HTTP thread并不会归还到容器。
 20 | 
 21 | 下面是一个官方的例子：
 22 | 
 23 | ```java
 24 | @WebServlet(urlPatterns={"/asyncservlet"}, asyncSupported=true)
 25 | public class AsyncServlet extends HttpServlet {
 26 |    /* ... Same variables and init method as in SyncServlet ... */
 27 | 
 28 |    @Override
 29 |    public void doGet(HttpServletRequest request, 
 30 |                      HttpServletResponse response) {
 31 |       response.setContentType("text/html;charset=UTF-8");
 32 |       final AsyncContext acontext = request.startAsync();
 33 |       acontext.start(new Runnable() {
 34 |          public void run() {
 35 |             String param = acontext.getRequest().getParameter("param");
 36 |             String result = resource.process(param);
 37 |             HttpServletResponse response = acontext.getResponse();
 38 |             /* ... print to the response ... */
 39 |             acontext.complete(); 
 40 |          }
 41 |       });
 42 |    }
 43 | }
 44 | ```
 45 | 
 46 | ## 陷阱
 47 | 
 48 | 在这个官方例子里，每个HTTP thread都会开启另一个Worker thread来处理请求，然后把HTTP thread就归还给Web容器。但是看`AsyncContext.start()`方法的javadoc：
 49 | 
 50 | > Causes the container to dispatch a thread, possibly from a managed thread pool, to run the specified Runnable.
 51 | 
 52 | 实际上这里并没有规定Worker thread到底从哪里来，也许是HTTP thread pool之外的另一个thread pool？还是说就是HTTP thread pool？
 53 | 
 54 | [The Limited Usefulness of AsyncContext.start()][4]文章里写道：不同的Web容器对此有不同的实现，不过Tomcat实际上是利用HTTP thread pool来处理`AsyncContext.start()`的（见[AsyncStateMachine.java#L429][AsyncStateMachine.java_L429]）。
 55 | 
 56 | 这也就是说，我们原本是想释放HTTP thread的，但实际上并没有，因为有HTTP thread依然被用作Worker thread，只不过这个thread和接收请求的HTTP thread不是同一个而已。
 57 | 
 58 | 这个结论我们也可以通过[AsyncServlet1][src-AsyncServlet1]和[SyncServlet][src-SyncServlet]的Jmeter benchmark看出来，两者的throughput结果差不多。启动方法：启动[Main][src-Main]，然后利用Jmeter启动[benchmark.jmx][src-benchmark.jmx]（Tomcat默认配置下HTTP thread pool=200）。
 59 | 
 60 | ## 使用ExecutorService
 61 | 
 62 | 前面看到了Tomcat并没有单独维护Worker thread pool，那么我们就得自己想办法搞一个，见[AsyncServlet2][src-AsyncServlet2]，它使用了一个带Thread pool的ExecutorService来处理AsyncContext。
 63 | 
 64 | ## 其他方式
 65 | 
 66 | 所以对于AsyncContext的使用并没有固定的方式，你可以根据实际需要去采用不同的方式来处理，为此你需要一点Java concurrent programming的知识。
 67 | 
 68 | ## 对于性能的误解
 69 | 
 70 | AsyncContext的目的并不是为了**提高性能**，也并不直接提供性能提升，它提供了把HTTP thread和Worker thread解藕的机制，从而提高Web容器的**响应能力**。
 71 | 
 72 | 不过AsyncContext在某些时候的确能够提高性能，但这个取决于你的代码是怎么写的。
 73 | 比如：Web容器的HTTP thread pool数量200，某个Servlet使用一个300的Worker thread pool来处理AsyncContext。
 74 | 相比Sync方式Worker thread pool=HTTP thread pool=200，在这种情况下我们有了300的Worker thread pool，所以肯定能够带来一些性能上的提升（毕竟干活的人多了）。
 75 | 
 76 | 相反，如果当Worker thread的数量<=HTTP thread数量的时候，那么就不会得到性能提升，因为此时处理请求的瓶颈在Worker thread。
 77 | 你可以修改[AsyncServlet2][src-AsyncServlet2]的线程池大小，把它和[SyncServlet][src-SyncServlet]比较benchmark结果来验证这一结论。
 78 | 
 79 | **一定不要认为Worker thread pool必须比HTTP thread pool大**，理由如下：
 80 | 
 81 | 1. 两者职责不同，一个是Web容器用来接收外来请求，一个是处理业务逻辑
 82 | 1. thread的创建是有代价的，如果HTTP thread pool已经很大了再搞一个更大的Worker thread pool反而会造成过多的Context switch和内存开销
 83 | 1. AsyncContext的目的是将HTTP thread释放出来，避免被操作长期占用进而导致Web容器无法响应
 84 | 
 85 | 所以在更多时候，Worker thread pool不会很大，而且会根据不同业务构建不同的Worker thread pool。
 86 | 比如：Web容器thread pool大小200，一个慢速Servlet的Worker thread pool大小10，这样一来，无论有多少请求到慢速操作，它都不会将HTTP thread占满导致其他请求无法处理。
 87 | 
 88 | 
 89 | ## 相关资料
 90 | 
 91 | * [Java EE 7 Tutorial: Java Servlet Technology - Asynchronous Processing](https://docs.oracle.com/javaee/7/tutorial/servlets012.htm)
 92 | * [The Limited Usefulness of AsyncContext.start()][4]
 93 | 
 94 |  [4]: https://dzone.com/articles/limited-usefulness
 95 |  [src-Main]: src/main/java/me/chanjar/learning/Main.java
 96 |  [src-SyncServlet]: src/main/java/me/chanjar/learning/SyncServlet.java
 97 |  [src-AsyncServlet1]: src/main/java/me/chanjar/learning/AsyncServlet1.java
 98 |  [src-AsyncServlet2]: src/main/java/me/chanjar/learning/AsyncServlet2.java
 99 |  [src-benchmark.jmx]: benchmark.jmx
100 |  [AsyncStateMachine.java_L429]: https://github.com/apache/tomcat85/blob/TOMCAT_8_5_23/java/org/apache/coyote/AsyncStateMachine.java#L429
101 | 


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/servlet-async-processing/benchmark.jmx:
--------------------------------------------------------------------------------
  1 | <?xml version="1.0" encoding="UTF-8"?>
  2 | <jmeterTestPlan version="1.2" properties="3.1" jmeter="3.1 r1770033">
  3 |   <hashTree>
  4 |     <TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="测试计划" enabled="true">
  5 |       <stringProp name="TestPlan.comments"></stringProp>
  6 |       <boolProp name="TestPlan.functional_mode">false</boolProp>
  7 |       <boolProp name="TestPlan.serialize_threadgroups">true</boolProp>
  8 |       <elementProp name="TestPlan.user_defined_variables" elementType="Arguments" guiclass="ArgumentsPanel" testclass="Arguments" testname="用户定义的变量" enabled="true">
  9 |         <collectionProp name="Arguments.arguments">
 10 |           <elementProp name="iteration" elementType="Argument">
 11 |             <stringProp name="Argument.name">iteration</stringProp>
 12 |             <stringProp name="Argument.value">5</stringProp>
 13 |             <stringProp name="Argument.metadata">=</stringProp>
 14 |           </elementProp>
 15 |           <elementProp name="users" elementType="Argument">
 16 |             <stringProp name="Argument.name">users</stringProp>
 17 |             <stringProp name="Argument.value">400</stringProp>
 18 |             <stringProp name="Argument.metadata">=</stringProp>
 19 |           </elementProp>
 20 |           <elementProp name="rampup" elementType="Argument">
 21 |             <stringProp name="Argument.name">rampup</stringProp>
 22 |             <stringProp name="Argument.value">0</stringProp>
 23 |             <stringProp name="Argument.metadata">=</stringProp>
 24 |           </elementProp>
 25 |         </collectionProp>
 26 |       </elementProp>
 27 |       <stringProp name="TestPlan.user_define_classpath"></stringProp>
 28 |       <boolProp name="TestPlan.tearDown_on_shutdown">true</boolProp>
 29 |     </TestPlan>
 30 |     <hashTree>
 31 |       <ConfigTestElement guiclass="HttpDefaultsGui" testclass="ConfigTestElement" testname="HTTP Request Defaults" enabled="true">
 32 |         <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
 33 |           <collectionProp name="Arguments.arguments"/>
 34 |         </elementProp>
 35 |         <stringProp name="HTTPSampler.domain">localhost</stringProp>
 36 |         <stringProp name="HTTPSampler.port">8080</stringProp>
 37 |         <stringProp name="HTTPSampler.connect_timeout"></stringProp>
 38 |         <stringProp name="HTTPSampler.response_timeout"></stringProp>
 39 |         <stringProp name="HTTPSampler.protocol"></stringProp>
 40 |         <stringProp name="HTTPSampler.contentEncoding"></stringProp>
 41 |         <stringProp name="HTTPSampler.path"></stringProp>
 42 |         <stringProp name="HTTPSampler.implementation">HttpClient4</stringProp>
 43 |         <stringProp name="HTTPSampler.concurrentPool">6</stringProp>
 44 |       </ConfigTestElement>
 45 |       <hashTree/>
 46 |       <ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="sync-servlet" enabled="true">
 47 |         <stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
 48 |         <elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller" enabled="true">
 49 |           <boolProp name="LoopController.continue_forever">false</boolProp>
 50 |           <stringProp name="LoopController.loops">${iteration}</stringProp>
 51 |         </elementProp>
 52 |         <stringProp name="ThreadGroup.num_threads">${users}</stringProp>
 53 |         <stringProp name="ThreadGroup.ramp_time">${rampup}</stringProp>
 54 |         <longProp name="ThreadGroup.start_time">1512530334000</longProp>
 55 |         <longProp name="ThreadGroup.end_time">1512530334000</longProp>
 56 |         <boolProp name="ThreadGroup.scheduler">false</boolProp>
 57 |         <stringProp name="ThreadGroup.duration"></stringProp>
 58 |         <stringProp name="ThreadGroup.delay"></stringProp>
 59 |         <boolProp name="ThreadGroup.delayedStart">true</boolProp>
 60 |       </ThreadGroup>
 61 |       <hashTree>
 62 |         <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="sync-servlet" enabled="true">
 63 |           <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
 64 |             <collectionProp name="Arguments.arguments"/>
 65 |           </elementProp>
 66 |           <stringProp name="HTTPSampler.domain"></stringProp>
 67 |           <stringProp name="HTTPSampler.port"></stringProp>
 68 |           <stringProp name="HTTPSampler.connect_timeout"></stringProp>
 69 |           <stringProp name="HTTPSampler.response_timeout"></stringProp>
 70 |           <stringProp name="HTTPSampler.protocol"></stringProp>
 71 |           <stringProp name="HTTPSampler.contentEncoding"></stringProp>
 72 |           <stringProp name="HTTPSampler.path">/sync-servlet</stringProp>
 73 |           <stringProp name="HTTPSampler.method">GET</stringProp>
 74 |           <boolProp name="HTTPSampler.follow_redirects">true</boolProp>
 75 |           <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
 76 |           <boolProp name="HTTPSampler.use_keepalive">true</boolProp>
 77 |           <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
 78 |           <boolProp name="HTTPSampler.monitor">false</boolProp>
 79 |           <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
 80 |         </HTTPSamplerProxy>
 81 |         <hashTree/>
 82 |       </hashTree>
 83 |       <ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="async-servlet-1" enabled="true">
 84 |         <stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
 85 |         <elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller" enabled="true">
 86 |           <boolProp name="LoopController.continue_forever">false</boolProp>
 87 |           <stringProp name="LoopController.loops">${iteration}</stringProp>
 88 |         </elementProp>
 89 |         <stringProp name="ThreadGroup.num_threads">${users}</stringProp>
 90 |         <stringProp name="ThreadGroup.ramp_time">${rampup}</stringProp>
 91 |         <longProp name="ThreadGroup.start_time">1512530334000</longProp>
 92 |         <longProp name="ThreadGroup.end_time">1512530334000</longProp>
 93 |         <boolProp name="ThreadGroup.scheduler">false</boolProp>
 94 |         <stringProp name="ThreadGroup.duration"></stringProp>
 95 |         <stringProp name="ThreadGroup.delay"></stringProp>
 96 |         <boolProp name="ThreadGroup.delayedStart">true</boolProp>
 97 |       </ThreadGroup>
 98 |       <hashTree>
 99 |         <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="async-servlet-1" enabled="true">
100 |           <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
101 |             <collectionProp name="Arguments.arguments"/>
102 |           </elementProp>
103 |           <stringProp name="HTTPSampler.domain"></stringProp>
104 |           <stringProp name="HTTPSampler.port"></stringProp>
105 |           <stringProp name="HTTPSampler.connect_timeout"></stringProp>
106 |           <stringProp name="HTTPSampler.response_timeout"></stringProp>
107 |           <stringProp name="HTTPSampler.protocol"></stringProp>
108 |           <stringProp name="HTTPSampler.contentEncoding"></stringProp>
109 |           <stringProp name="HTTPSampler.path">/async-servlet-1</stringProp>
110 |           <stringProp name="HTTPSampler.method">GET</stringProp>
111 |           <boolProp name="HTTPSampler.follow_redirects">true</boolProp>
112 |           <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
113 |           <boolProp name="HTTPSampler.use_keepalive">true</boolProp>
114 |           <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
115 |           <boolProp name="HTTPSampler.monitor">false</boolProp>
116 |           <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
117 |         </HTTPSamplerProxy>
118 |         <hashTree/>
119 |       </hashTree>
120 |       <ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="async-servlet-2" enabled="true">
121 |         <stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
122 |         <elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller" enabled="true">
123 |           <boolProp name="LoopController.continue_forever">false</boolProp>
124 |           <stringProp name="LoopController.loops">${iteration}</stringProp>
125 |         </elementProp>
126 |         <stringProp name="ThreadGroup.num_threads">${users}</stringProp>
127 |         <stringProp name="ThreadGroup.ramp_time">${rampup}</stringProp>
128 |         <longProp name="ThreadGroup.start_time">1512530334000</longProp>
129 |         <longProp name="ThreadGroup.end_time">1512530334000</longProp>
130 |         <boolProp name="ThreadGroup.scheduler">false</boolProp>
131 |         <stringProp name="ThreadGroup.duration"></stringProp>
132 |         <stringProp name="ThreadGroup.delay"></stringProp>
133 |         <boolProp name="ThreadGroup.delayedStart">true</boolProp>
134 |       </ThreadGroup>
135 |       <hashTree>
136 |         <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="async-servlet-2" enabled="true">
137 |           <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
138 |             <collectionProp name="Arguments.arguments"/>
139 |           </elementProp>
140 |           <stringProp name="HTTPSampler.domain"></stringProp>
141 |           <stringProp name="HTTPSampler.port"></stringProp>
142 |           <stringProp name="HTTPSampler.connect_timeout"></stringProp>
143 |           <stringProp name="HTTPSampler.response_timeout"></stringProp>
144 |           <stringProp name="HTTPSampler.protocol"></stringProp>
145 |           <stringProp name="HTTPSampler.contentEncoding"></stringProp>
146 |           <stringProp name="HTTPSampler.path">/async-servlet-2</stringProp>
147 |           <stringProp name="HTTPSampler.method">GET</stringProp>
148 |           <boolProp name="HTTPSampler.follow_redirects">true</boolProp>
149 |           <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
150 |           <boolProp name="HTTPSampler.use_keepalive">true</boolProp>
151 |           <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
152 |           <boolProp name="HTTPSampler.monitor">false</boolProp>
153 |           <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
154 |         </HTTPSamplerProxy>
155 |         <hashTree/>
156 |       </hashTree>
157 |       <ResultCollector guiclass="StatGraphVisualizer" testclass="ResultCollector" testname="Aggregate Graph" enabled="true">
158 |         <boolProp name="ResultCollector.error_logging">false</boolProp>
159 |         <objProp>
160 |           <name>saveConfig</name>
161 |           <value class="SampleSaveConfiguration">
162 |             <time>true</time>
163 |             <latency>true</latency>
164 |             <timestamp>true</timestamp>
165 |             <success>true</success>
166 |             <label>true</label>
167 |             <code>true</code>
168 |             <message>true</message>
169 |             <threadName>true</threadName>
170 |             <dataType>true</dataType>
171 |             <encoding>false</encoding>
172 |             <assertions>true</assertions>
173 |             <subresults>true</subresults>
174 |             <responseData>false</responseData>
175 |             <samplerData>false</samplerData>
176 |             <xml>false</xml>
177 |             <fieldNames>true</fieldNames>
178 |             <responseHeaders>false</responseHeaders>
179 |             <requestHeaders>false</requestHeaders>
180 |             <responseDataOnError>false</responseDataOnError>
181 |             <saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
182 |             <assertionsResultsToSave>0</assertionsResultsToSave>
183 |             <bytes>true</bytes>
184 |             <sentBytes>true</sentBytes>
185 |             <threadCounts>true</threadCounts>
186 |             <idleTime>true</idleTime>
187 |             <connectTime>true</connectTime>
188 |           </value>
189 |         </objProp>
190 |         <stringProp name="filename"></stringProp>
191 |       </ResultCollector>
192 |       <hashTree/>
193 |       <ResultCollector guiclass="ViewResultsFullVisualizer" testclass="ResultCollector" testname="View Results Tree" enabled="true">
194 |         <boolProp name="ResultCollector.error_logging">true</boolProp>
195 |         <objProp>
196 |           <name>saveConfig</name>
197 |           <value class="SampleSaveConfiguration">
198 |             <time>true</time>
199 |             <latency>true</latency>
200 |             <timestamp>true</timestamp>
201 |             <success>true</success>
202 |             <label>true</label>
203 |             <code>true</code>
204 |             <message>true</message>
205 |             <threadName>true</threadName>
206 |             <dataType>true</dataType>
207 |             <encoding>false</encoding>
208 |             <assertions>true</assertions>
209 |             <subresults>true</subresults>
210 |             <responseData>false</responseData>
211 |             <samplerData>false</samplerData>
212 |             <xml>false</xml>
213 |             <fieldNames>true</fieldNames>
214 |             <responseHeaders>false</responseHeaders>
215 |             <requestHeaders>false</requestHeaders>
216 |             <responseDataOnError>false</responseDataOnError>
217 |             <saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
218 |             <assertionsResultsToSave>0</assertionsResultsToSave>
219 |             <bytes>true</bytes>
220 |             <sentBytes>true</sentBytes>
221 |             <threadCounts>true</threadCounts>
222 |             <idleTime>true</idleTime>
223 |             <connectTime>true</connectTime>
224 |           </value>
225 |         </objProp>
226 |         <stringProp name="filename"></stringProp>
227 |       </ResultCollector>
228 |       <hashTree/>
229 |       <kg.apc.jmeter.vizualizers.CorrectedResultCollector guiclass="kg.apc.jmeter.vizualizers.ResponseTimesOverTimeGui" testclass="kg.apc.jmeter.vizualizers.CorrectedResultCollector" testname="Response Times Over Time" enabled="true">
230 |         <boolProp name="ResultCollector.error_logging">false</boolProp>
231 |         <objProp>
232 |           <name>saveConfig</name>
233 |           <value class="SampleSaveConfiguration">
234 |             <time>true</time>
235 |             <latency>true</latency>
236 |             <timestamp>true</timestamp>
237 |             <success>true</success>
238 |             <label>true</label>
239 |             <code>true</code>
240 |             <message>true</message>
241 |             <threadName>true</threadName>
242 |             <dataType>true</dataType>
243 |             <encoding>false</encoding>
244 |             <assertions>true</assertions>
245 |             <subresults>true</subresults>
246 |             <responseData>false</responseData>
247 |             <samplerData>false</samplerData>
248 |             <xml>false</xml>
249 |             <fieldNames>true</fieldNames>
250 |             <responseHeaders>false</responseHeaders>
251 |             <requestHeaders>false</requestHeaders>
252 |             <responseDataOnError>false</responseDataOnError>
253 |             <saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
254 |             <assertionsResultsToSave>0</assertionsResultsToSave>
255 |             <bytes>true</bytes>
256 |             <sentBytes>true</sentBytes>
257 |             <threadCounts>true</threadCounts>
258 |             <idleTime>true</idleTime>
259 |             <connectTime>true</connectTime>
260 |           </value>
261 |         </objProp>
262 |         <stringProp name="filename"></stringProp>
263 |         <longProp name="interval_grouping">500</longProp>
264 |         <boolProp name="graph_aggregated">false</boolProp>
265 |         <stringProp name="include_sample_labels"></stringProp>
266 |         <stringProp name="exclude_sample_labels"></stringProp>
267 |         <stringProp name="start_offset"></stringProp>
268 |         <stringProp name="end_offset"></stringProp>
269 |         <boolProp name="include_checkbox_state">false</boolProp>
270 |         <boolProp name="exclude_checkbox_state">false</boolProp>
271 |         <boolProp name="ResultCollector.success_only_logging">true</boolProp>
272 |       </kg.apc.jmeter.vizualizers.CorrectedResultCollector>
273 |       <hashTree/>
274 |       <kg.apc.jmeter.vizualizers.CorrectedResultCollector guiclass="kg.apc.jmeter.vizualizers.TransactionsPerSecondGui" testclass="kg.apc.jmeter.vizualizers.CorrectedResultCollector" testname="Transactions per Second" enabled="true">
275 |         <boolProp name="ResultCollector.error_logging">false</boolProp>
276 |         <objProp>
277 |           <name>saveConfig</name>
278 |           <value class="SampleSaveConfiguration">
279 |             <time>true</time>
280 |             <latency>true</latency>
281 |             <timestamp>true</timestamp>
282 |             <success>true</success>
283 |             <label>true</label>
284 |             <code>true</code>
285 |             <message>true</message>
286 |             <threadName>true</threadName>
287 |             <dataType>true</dataType>
288 |             <encoding>false</encoding>
289 |             <assertions>true</assertions>
290 |             <subresults>true</subresults>
291 |             <responseData>false</responseData>
292 |             <samplerData>false</samplerData>
293 |             <xml>false</xml>
294 |             <fieldNames>true</fieldNames>
295 |             <responseHeaders>false</responseHeaders>
296 |             <requestHeaders>false</requestHeaders>
297 |             <responseDataOnError>false</responseDataOnError>
298 |             <saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
299 |             <assertionsResultsToSave>0</assertionsResultsToSave>
300 |             <bytes>true</bytes>
301 |             <sentBytes>true</sentBytes>
302 |             <threadCounts>true</threadCounts>
303 |             <idleTime>true</idleTime>
304 |             <connectTime>true</connectTime>
305 |           </value>
306 |         </objProp>
307 |         <stringProp name="filename"></stringProp>
308 |         <longProp name="interval_grouping">1000</longProp>
309 |         <boolProp name="graph_aggregated">false</boolProp>
310 |         <stringProp name="include_sample_labels"></stringProp>
311 |         <stringProp name="exclude_sample_labels"></stringProp>
312 |         <stringProp name="start_offset"></stringProp>
313 |         <stringProp name="end_offset"></stringProp>
314 |         <boolProp name="include_checkbox_state">false</boolProp>
315 |         <boolProp name="exclude_checkbox_state">false</boolProp>
316 |         <boolProp name="ResultCollector.success_only_logging">true</boolProp>
317 |       </kg.apc.jmeter.vizualizers.CorrectedResultCollector>
318 |       <hashTree/>
319 |     </hashTree>
320 |   </hashTree>
321 | </jmeterTestPlan>
322 | 


--------------------------------------------------------------------------------
/servlet-async-processing/pom.xml:
--------------------------------------------------------------------------------
 1 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2 |          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 3 |   <modelVersion>4.0.0</modelVersion>
 4 | 
 5 |   <parent>
 6 |     <groupId>me.chanjar.learning</groupId>
 7 |     <artifactId>web-async-learn-aggregator</artifactId>
 8 |     <version>1.0-SNAPSHOT</version>
 9 |   </parent>
10 | 
11 |   <groupId>me.chanjar.learning</groupId>
12 |   <artifactId>servlet-async-processing</artifactId>
13 |   <packaging>war</packaging>
14 | 
15 |   <dependencies>
16 | 
17 |     <dependency>
18 |       <groupId>javax.servlet</groupId>
19 |       <artifactId>javax.servlet-api</artifactId>
20 |     </dependency>
21 | 
22 |     <dependency>
23 |       <groupId>me.chanjar.learning</groupId>
24 |       <artifactId>tomcat-start</artifactId>
25 |       <version>${project.version}</version>
26 |     </dependency>
27 | 
28 |     <dependency>
29 |       <groupId>junit</groupId>
30 |       <artifactId>junit</artifactId>
31 |       <version>3.8.1</version>
32 |       <scope>test</scope>
33 |     </dependency>
34 |   </dependencies>
35 | </project>
36 | 


--------------------------------------------------------------------------------
/servlet-async-processing/src/main/java/me/chanjar/learning/AsyncServlet1.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import javax.servlet.AsyncContext;
 4 | import javax.servlet.ServletException;
 5 | import javax.servlet.annotation.WebServlet;
 6 | import javax.servlet.http.HttpServlet;
 7 | import javax.servlet.http.HttpServletRequest;
 8 | import javax.servlet.http.HttpServletResponse;
 9 | import java.io.IOException;
10 | 
11 | @WebServlet(value = "/async-servlet-1", asyncSupported = true)
12 | public class AsyncServlet1 extends HttpServlet {
13 | 
14 |   @Override
15 |   protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
16 | 
17 |     AsyncContext asyncCtx = req.startAsync();
18 |     asyncCtx.start(new SlowJobRunner(new SlowJob("async servlet1"), asyncCtx));
19 | 
20 |   }
21 | 
22 | }
23 | 


--------------------------------------------------------------------------------
/servlet-async-processing/src/main/java/me/chanjar/learning/AsyncServlet2.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import javax.servlet.AsyncContext;
 4 | import javax.servlet.ServletException;
 5 | import javax.servlet.annotation.WebServlet;
 6 | import javax.servlet.http.HttpServlet;
 7 | import javax.servlet.http.HttpServletRequest;
 8 | import javax.servlet.http.HttpServletResponse;
 9 | import java.io.IOException;
10 | import java.util.concurrent.ExecutorService;
11 | import java.util.concurrent.Executors;
12 | import java.util.concurrent.TimeUnit;
13 | 
14 | @WebServlet(value = "/async-servlet-2", asyncSupported = true)
15 | public class AsyncServlet2 extends HttpServlet {
16 | 
17 |   private volatile ExecutorService executorService;
18 | 
19 |   @Override
20 |   protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
21 | 
22 |     AsyncContext asyncCtx = req.startAsync();
23 |     executorService.submit(new SlowJobRunner(new SlowJob("async servlet2"), asyncCtx));
24 | 
25 |   }
26 | 
27 |   @Override
28 |   public void init() throws ServletException {
29 | 
30 |     super.init();
31 |     executorService = Executors.newFixedThreadPool(400);
32 |   }
33 | 
34 |   @Override
35 |   public void destroy() {
36 | 
37 |     super.destroy();
38 |     executorService.shutdown();
39 |     boolean successfulTerminated = false;
40 |     try {
41 |       successfulTerminated = executorService.awaitTermination(5, TimeUnit.SECONDS);
42 |     } catch (InterruptedException e) {
43 |       e.printStackTrace();
44 |     }
45 |     if (!successfulTerminated) {
46 |       executorService.shutdownNow();
47 |     }
48 |     executorService = null;
49 |   }
50 | 
51 | }
52 | 


--------------------------------------------------------------------------------
/servlet-async-processing/src/main/java/me/chanjar/learning/Main.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | public class Main {
 4 | 
 5 |   public static void main(String[] args) throws Exception {
 6 | 
 7 |     TomcatStart.start();
 8 | 
 9 |   }
10 | 
11 | }
12 | 


--------------------------------------------------------------------------------
/servlet-async-processing/src/main/java/me/chanjar/learning/SlowJob.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | public class SlowJob {
 4 | 
 5 |   private final String name;
 6 | 
 7 |   public SlowJob(String name) {
 8 |     this.name = name;
 9 |   }
10 | 
11 |   public String doWork() {
12 |     try {
13 |       Thread.sleep(1000L);
14 |       return "Hi from " + name;
15 |     } catch (InterruptedException e) {
16 |       e.printStackTrace();
17 |     }
18 |     return null;
19 | 
20 |   }
21 | 
22 | }
23 | 


--------------------------------------------------------------------------------
/servlet-async-processing/src/main/java/me/chanjar/learning/SlowJobRunner.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import javax.servlet.AsyncContext;
 4 | import java.io.IOException;
 5 | import java.io.PrintWriter;
 6 | 
 7 | public class SlowJobRunner implements Runnable {
 8 | 
 9 |   private final SlowJob job;
10 | 
11 |   private final AsyncContext asyncContext;
12 | 
13 |   public SlowJobRunner(SlowJob job, AsyncContext asyncContext) {
14 |     this.job = job;
15 |     this.asyncContext = asyncContext;
16 |   }
17 | 
18 |   @Override
19 |   public void run() {
20 | 
21 |     try {
22 |       String result = job.doWork();
23 |       PrintWriter writer = asyncContext.getResponse().getWriter();
24 |       writer.println(result);
25 |       writer.flush();
26 |       asyncContext.complete();
27 |     } catch (IOException e) {
28 |       e.printStackTrace();
29 |     }
30 | 
31 |   }
32 | 
33 | }
34 | 


--------------------------------------------------------------------------------
/servlet-async-processing/src/main/java/me/chanjar/learning/SyncServlet.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import javax.servlet.ServletException;
 4 | import javax.servlet.annotation.WebServlet;
 5 | import javax.servlet.http.HttpServlet;
 6 | import javax.servlet.http.HttpServletRequest;
 7 | import javax.servlet.http.HttpServletResponse;
 8 | import java.io.IOException;
 9 | import java.io.PrintWriter;
10 | 
11 | @WebServlet("/sync-servlet")
12 | public class SyncServlet extends HttpServlet {
13 | 
14 |   @Override
15 |   protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
16 | 
17 |     PrintWriter writer = resp.getWriter();
18 |     String result = new SlowJob("sync servlet").doWork();
19 |     writer.println(result);
20 |     writer.flush();
21 | 
22 |   }
23 | 
24 | }
25 | 


--------------------------------------------------------------------------------
/spring-mvc-async-io/README.md:
--------------------------------------------------------------------------------
  1 | # Spring MVC Async IO
  2 | 
  3 | 在[前一篇文章][ref-spring-mvc-async-proc]里介绍了Spring MVC对于Servlet 3.0 Async Processing的支持。
  4 | 同时也提到了Spring MVC并没有提供对Servlet 3.1 Async IO的直接支持，本文介绍一些在Spring MVC中使用到Servlet 3.1 Async Processing的方法。
  5 | 
  6 | 在开始讲解前要先了解Spring MVC是如何做Async Processing的，这里涉及到一个关键类`WebAsyncManager`。
  7 | 
  8 | ## WebAsyncManager
  9 | 
 10 | 在[前一篇文章][ref-spring-mvc-async-proc]里提到过以下几种`AsyncHandlerMethodReturnValueHandler`：
 11 | 
 12 | 1. `CallableMethodReturnValueHandler`
 13 | 1. `DeferredResultMethodReturnValueHandler`
 14 | 1. `ResponseBodyEmitterReturnValueHandler`
 15 | 1. `StreamingResponseBodyReturnValueHandler`
 16 | 
 17 | 仔细看这些Handler的代码会发现最终都使用`WebAsyncManager`执行异步处理。
 18 | 
 19 | `WebAsyncManager`执行的大致动作有这么几个：
 20 | 
 21 | 1. 调用`ServletRequest.startAsync()`
 22 | 1. 使用`AsyncTaskExecutor`开启另一个线程执行任务
 23 | 1. 调用各种Interceptor的回调方法，比如`CallableProcessingInterceptor`和`DeferredResultProcessingInterceptor`
 24 | 
 25 | 下面以`Callable<?>`为例，详细讲解一下`WebAsyncManager`的执行过程（下面的T-*代表不同的线程）：
 26 | 
 27 | 1. T-http-1: `WebAsyncManager.startCallableProcessing`
 28 | 1. T-http-1: `CallableInterceptorChain.applyBeforeConcurrentHandling` -> `CallableProcessingInterceptor.beforeConcurrentHandling`
 29 | 1. T-http-1: `WebAsyncManager.startAsyncProcessing` -> `AsyncWebRequest.startAsync` -> `ServletRequest.startAsync`
 30 | 1. T-http-1: `AsyncTaskExecutor.submit(Callable)`
 31 | 1. T-mvc-async: `CallableInterceptorChain.applyPreProcess` -> `CallableProcessingInterceptor.preProcess`
 32 | 1. T-mvc-async: `Callable.run`，等待执行完毕
 33 | 1. T-mvc-async: `CallableInterceptorChain.applyPostProcess` -> `CallableProcessingInterceptor.postProcess`
 34 | 1. T-mvc-async: `WebAsyncManager.setConcurrentResultAndDispatch` -> `AsyncWebRequest.dispatch` -> `ServletRequest.dispatch`
 35 | 1. T-http-2: DispatchServlet ...
 36 | 1. T-http-2: `AsyncWebRequest.onComplete` -> `CallableInterceptorChain.triggerAfterCompletion` -> `CallableProcessingInterceptor.afterCompletion`
 37 | 
 38 | 上面的结果可以通过观察源代码、访问[http://localhost:8080/callable-trace][url-callable-trace]查看日志，下面是日志样例（注意观察`CallableProcessingLogger`）：
 39 | 
 40 | ```
 41 | 2017-12-25 16:58:09.632 DEBUG 19794 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : DispatcherServlet with name 'dispatcherServlet' processing GET request for [/callable-trace]
 42 | 2017-12-25 16:58:09.632 DEBUG 19794 --- [nio-8080-exec-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Looking up handler method for path /callable-trace
 43 | 2017-12-25 16:58:09.632 DEBUG 19794 --- [nio-8080-exec-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Returning handler method [public java.util.concurrent.Callable<java.lang.String> me.chanjar.learning.CallableTraceController.hello()]
 44 | 2017-12-25 16:58:09.632 DEBUG 19794 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Last-Modified value for [/callable-trace] is: -1
 45 | 2017-12-25 16:58:09.633  INFO 19794 --- [nio-8080-exec-1] orConfiguration$CallableProcessingLogger : beforeConcurrentHandling
 46 | 2017-12-25 16:58:09.633 DEBUG 19794 --- [nio-8080-exec-1] o.s.w.c.request.async.WebAsyncManager    : Concurrent handling starting for GET [/callable-trace]
 47 | 2017-12-25 16:58:09.633 DEBUG 19794 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Leaving response open for concurrent processing
 48 | 2017-12-25 16:58:09.633  INFO 19794 --- [ my-mvc-async-1] orConfiguration$CallableProcessingLogger : preProcess
 49 | 2017-12-25 16:58:10.636  INFO 19794 --- [ my-mvc-async-1] orConfiguration$CallableProcessingLogger : postProcess
 50 | 2017-12-25 16:58:10.636 DEBUG 19794 --- [ my-mvc-async-1] o.s.w.c.request.async.WebAsyncManager    : Concurrent result value [Hi from CallableTraceController. Current Thread: my-mvc-async-2] - dispatching request to resume processing
 51 | 2017-12-25 16:58:10.636 DEBUG 19794 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : DispatcherServlet with name 'dispatcherServlet' resumed processing GET request for [/callable-trace]
 52 | 2017-12-25 16:58:10.637 DEBUG 19794 --- [nio-8080-exec-2] s.w.s.m.m.a.RequestMappingHandlerMapping : Looking up handler method for path /callable-trace
 53 | 2017-12-25 16:58:10.637 DEBUG 19794 --- [nio-8080-exec-2] s.w.s.m.m.a.RequestMappingHandlerMapping : Returning handler method [public java.util.concurrent.Callable<java.lang.String> me.chanjar.learning.CallableTraceController.hello()]
 54 | 2017-12-25 16:58:10.637 DEBUG 19794 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Last-Modified value for [/callable-trace] is: -1
 55 | 2017-12-25 16:58:10.637 DEBUG 19794 --- [nio-8080-exec-2] s.w.s.m.m.a.RequestMappingHandlerAdapter : Found concurrent result value [Hi from CallableTraceController. Current Thread: my-mvc-async-2]
 56 | 2017-12-25 16:58:10.638 DEBUG 19794 --- [nio-8080-exec-2] m.m.a.RequestResponseBodyMethodProcessor : Written [Hi from CallableTraceController. Current Thread: my-mvc-async-2] as "text/plain" using [org.springframework.http.converter.StringHttpMessageConverter@70444987]
 57 | 2017-12-25 16:58:10.639 DEBUG 19794 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Null ModelAndView returned to DispatcherServlet with name 'dispatcherServlet': assuming HandlerAdapter completed request handling
 58 | 2017-12-25 16:58:10.639 DEBUG 19794 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Successfully completed request
 59 | 2017-12-25 16:58:10.639  INFO 19794 --- [nio-8080-exec-2] orConfiguration$CallableProcessingLogger : afterCompletion
 60 | ```
 61 | 
 62 | ## 将ReadListener加到MVC异步处理过程
 63 | 
 64 | 先来回顾一下使用`ReadListener`的大致步骤：
 65 | 
 66 | ```java
 67 | 
 68 | protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
 69 | 
 70 |   AsyncContext asyncCtx = req.startAsync();
 71 |   ServletInputStream is = req.getInputStream();
 72 |   is.setReadListener(new ReadListener() {
 73 | 
 74 |     @Override
 75 |     public void onDataAvailable() {
 76 | 
 77 |         while (is.isReady() && !is.isFinished()) {
 78 |           int length = is.read(buffer);
 79 |           if (length == -1 && is.isFinished()) {
 80 |             asyncCtx.complete();
 81 |             return;
 82 |           }
 83 |           // 处理buffer
 84 |         }
 85 | 
 86 |     }
 87 | 
 88 |     @Override
 89 |     public void onAllDataRead() {
 90 |       // ...
 91 |     }
 92 | 
 93 |     @Override
 94 |     public void onError(Throwable t) {
 95 |       // ...
 96 |     }
 97 |   });
 98 | 
 99 | }
100 | ```
101 | 
102 | 所以如果要使用`ReadListener`，那么能够切入的点有两个：第5步和第7步。
103 | 
104 | 如果在第5步`CallableProcessingInterceptor.preProcess`里使用`ReadListener`则：
105 | 
106 | * 在`ReadListener.onAllDataRead`或者`onError`之前，`Callable<?>`必须阻塞。
107 | * `ReadListener`和`Callable<?>`需要有通信机制。
108 | * `Callable<?>`可以根据不同情况返回不同的结果。
109 | 
110 | 如果在第7步`CallableProcessingInterceptor.postProcess`里使用`ReadListener`则：
111 | 
112 | * `Callable<?>`事实上变成事先返回结果，而不是等`ReadListener.onAllDataRead`或者`onError`。
113 | * `CallableProcessingInterceptor.postProcess`必须阻塞
114 | * `ReadListener`和`Callable<?>`无法存在通信机制。
115 | 
116 | 
117 | `spring.http.multipart.resolve-lazily=true`，否则被Multipart***事先消费掉inputStream中的内容。
118 | 
119 | curl -X POST  -F "bigfile=@src/main/resources/bigfile" --limit-rate 10k http://localhost:8080/async-io-read-hook-pre-process
120 | 
121 | 
122 | Tomcat 8.5.24及之前存在[BUG 61932][tc-issue-61932]，会导致出现。。。。。。TODO。。。。。。
123 | 
124 | ## 将WriteListener加到MVC异步处理过程
125 | 
126 | TODO
127 | 
128 | ## 相关资料
129 | 
130 | 
131 | * [Is Servlet 3.1 (Read|Write)Listener supported by DeferredResult in Spring 4?][ref-6]
132 | * [Slides - Servlet 3.1 Async IO][ref-2]
133 | * [WebAsyncManager][ref-1]
134 | * [AsyncStateMachine][ref-3]
135 | 
136 | [ref-1]: https://docs.spring.io/spring/docs/4.3.x/javadoc-api/org/springframework/web/context/request/async/WebAsyncManager.html
137 | [ref-2]: https://www.slideshare.net/SimoneBordet/servlet-31-async-io
138 | [ref-3]: https://tomcat.apache.org/tomcat-8.5-doc/api/org/apache/coyote/AsyncStateMachine.html
139 | [ref-6]: https://stackoverflow.com/questions/28828355/is-servlet-3-1-readwritelistener-supported-by-deferredresult-in-spring-4
140 | 
141 | [url-callable-trace]: http://localhost:8080/callable-trace
142 | [ref-spring-mvc-async-proc]: ../servlet-async-processing/README.md
143 | [tc-issue-61932]: https://bz.apache.org/bugzilla/show_bug.cgi?id=61932
144 | 


--------------------------------------------------------------------------------
/spring-mvc-async-io/pom.xml:
--------------------------------------------------------------------------------
 1 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2 |          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 3 |   <modelVersion>4.0.0</modelVersion>
 4 | 
 5 |   <parent>
 6 |     <groupId>org.springframework.boot</groupId>
 7 |     <artifactId>spring-boot-starter-parent</artifactId>
 8 |     <version>1.5.9.RELEASE</version>
 9 |   </parent>
10 | 
11 |   <groupId>me.chanjar.learning</groupId>
12 |   <artifactId>spring-mvc-async-io</artifactId>
13 |   <packaging>war</packaging>
14 | 
15 |   <properties>
16 |     <java.version>1.8</java.version>
17 |     <maven.compiler.source>1.8</maven.compiler.source>
18 |     <maven.compiler.target>1.8</maven.compiler.target>
19 |   </properties>
20 | 
21 | 
22 |   <dependencies>
23 |     <dependency>
24 |       <groupId>org.springframework.boot</groupId>
25 |       <artifactId>spring-boot-starter-thymeleaf</artifactId>
26 |     </dependency>
27 |     <dependency>
28 |       <groupId>org.springframework.boot</groupId>
29 |       <artifactId>spring-boot-devtools</artifactId>
30 |       <optional>true</optional>
31 |     </dependency>
32 |   </dependencies>
33 | 
34 |   <build>
35 |     <plugins>
36 |       <plugin>
37 |         <groupId>org.springframework.boot</groupId>
38 |         <artifactId>spring-boot-maven-plugin</artifactId>
39 |       </plugin>
40 |     </plugins>
41 |   </build>
42 | 
43 | </project>
44 | 


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/spring-mvc-async-io/src/main/java/me/chanjar/learning/Application.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import org.springframework.boot.SpringApplication;
 4 | import org.springframework.boot.autoconfigure.SpringBootApplication;
 5 | import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 6 | 
 7 | @SpringBootApplication
 8 | @EnableWebMvc
 9 | public class Application {
10 | 
11 |   public static void main(String[] args) {
12 |     SpringApplication.run(Application.class, args);
13 |   }
14 | 
15 | }
16 | 


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/spring-mvc-async-io/src/main/java/me/chanjar/learning/AsyncReadController.java:
--------------------------------------------------------------------------------
  1 | package me.chanjar.learning;
  2 | 
  3 | import org.slf4j.Logger;
  4 | import org.slf4j.LoggerFactory;
  5 | import org.springframework.web.bind.annotation.RequestMapping;
  6 | import org.springframework.web.bind.annotation.RestController;
  7 | import org.springframework.web.context.request.NativeWebRequest;
  8 | import org.springframework.web.context.request.async.CallableProcessingInterceptorAdapter;
  9 | import org.springframework.web.context.request.async.WebAsyncManager;
 10 | import org.springframework.web.context.request.async.WebAsyncUtils;
 11 | 
 12 | import javax.servlet.AsyncContext;
 13 | import javax.servlet.ReadListener;
 14 | import javax.servlet.ServletInputStream;
 15 | import javax.servlet.ServletRequest;
 16 | import javax.servlet.http.HttpServletRequest;
 17 | import java.io.IOException;
 18 | import java.util.concurrent.Callable;
 19 | 
 20 | @RestController
 21 | public class AsyncReadController {
 22 | 
 23 |   private static final Logger LOGGER = LoggerFactory.getLogger(AsyncReadController.class);
 24 | 
 25 |   @RequestMapping("async-io-read-hook-pre-process")
 26 |   public Callable<String> hookPreProcess(ServletRequest request) throws Exception {
 27 | 
 28 |     InnerCallable callable = new InnerCallable();
 29 | 
 30 |     WebAsyncManager asyncManager = WebAsyncUtils.getAsyncManager(request);
 31 |     asyncManager.registerCallableInterceptor("some-key", new InnerCallableProcessingInterceptor(callable));
 32 |     return callable;
 33 |   }
 34 | 
 35 |   private static class InnerCallable implements Callable<String> {
 36 | 
 37 |     private String result;
 38 | 
 39 |     private Exception exception;
 40 | 
 41 |     @Override
 42 |     public String call() throws Exception {
 43 |       synchronized (this) {
 44 |         this.wait();
 45 |       }
 46 |       if (exception != null) {
 47 |         throw exception;
 48 |       }
 49 |       return result;
 50 |     }
 51 | 
 52 |     public synchronized void onSuccess(String result) {
 53 |       this.result = result;
 54 |       this.notify();
 55 |     }
 56 | 
 57 |     public synchronized void onError(Throwable e) {
 58 |       if (e instanceof Exception) {
 59 |         this.exception = (Exception) e;
 60 |       } else {
 61 |         this.exception = new RuntimeException(e);
 62 |       }
 63 |       this.notify();
 64 |     }
 65 |   }
 66 | 
 67 |   private static class InnerCallableProcessingInterceptor extends CallableProcessingInterceptorAdapter {
 68 | 
 69 |     private final InnerCallable callable;
 70 | 
 71 |     public InnerCallableProcessingInterceptor(InnerCallable callable) {
 72 |       this.callable = callable;
 73 |     }
 74 | 
 75 |     @Override
 76 |     public <T> void preProcess(NativeWebRequest request, Callable<T> task) throws Exception {
 77 | 
 78 |       HttpServletRequest nativeRequest = (HttpServletRequest) request.getNativeRequest();
 79 |       AsyncContext asyncContext = nativeRequest.getAsyncContext();
 80 |       ServletInputStream is = nativeRequest.getInputStream();
 81 |       is.setReadListener(new ReadListener() {
 82 |         private int totalReadBytes = 0;
 83 | 
 84 |         @Override
 85 |         public void onDataAvailable() throws IOException {
 86 |           LOGGER.info("ReadListener onDataAvailable");
 87 | 
 88 |           try {
 89 |             byte buffer[] = new byte[1 * 1024];
 90 |             int readBytes = 0;
 91 |             while (is.isReady() && !is.isFinished()) {
 92 |               int length = is.read(buffer);
 93 |               if (length == -1 && is.isFinished()) {
 94 |                 LOGGER.info("Read: " + readBytes + " bytes");
 95 |                 LOGGER.info("Total Read: " + totalReadBytes + " bytes");
 96 |                 return;
 97 |               }
 98 |               readBytes += length;
 99 |               totalReadBytes += length;
100 | 
101 |             }
102 |             LOGGER.info("Read: " + readBytes + " bytes");
103 | 
104 |           } catch (IOException ex) {
105 |             throw new RuntimeException(ex);
106 |           }
107 |         }
108 | 
109 |         @Override
110 |         public void onAllDataRead() throws IOException {
111 |           LOGGER.info("ReadListener onAllDataRead");
112 |           is.close();
113 |           String msg = "ReadListener thread: " + Thread.currentThread().getName() + " succeeded";
114 |           callable.onSuccess(msg);
115 |         }
116 | 
117 |         @Override
118 |         public void onError(Throwable throwable) {
119 |           LOGGER.error("ReadListener onError");
120 |           callable.onError(throwable);
121 |         }
122 |       });
123 |     }
124 | 
125 |   }
126 | }
127 | 


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/spring-mvc-async-io/src/main/java/me/chanjar/learning/AsyncWriteController.java:
--------------------------------------------------------------------------------
1 | package me.chanjar.learning;
2 | 
3 | public class AsyncWriteController {
4 | }
5 | 


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/spring-mvc-async-io/src/main/java/me/chanjar/learning/CallableTraceController.java:
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 1 | package me.chanjar.learning;
 2 | 
 3 | import me.chanjar.learning.slowjob.SlowJob;
 4 | import org.springframework.web.bind.annotation.RequestMapping;
 5 | import org.springframework.web.bind.annotation.RestController;
 6 | 
 7 | import java.util.concurrent.Callable;
 8 | 
 9 | @RestController
10 | public class CallableTraceController {
11 | 
12 |   @RequestMapping("callable-trace")
13 |   public Callable<String> hello() {
14 |     return () -> new SlowJob("CallableTraceController").doWork();
15 |   }
16 | 
17 | }
18 | 


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/spring-mvc-async-io/src/main/java/me/chanjar/learning/config/AsyncInterceptorConfiguration.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning.config;
 2 | 
 3 | import org.slf4j.Logger;
 4 | import org.slf4j.LoggerFactory;
 5 | import org.springframework.context.annotation.Configuration;
 6 | import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
 7 | import org.springframework.web.context.request.NativeWebRequest;
 8 | import org.springframework.web.context.request.async.CallableProcessingInterceptor;
 9 | import org.springframework.web.servlet.config.annotation.AsyncSupportConfigurer;
10 | import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
11 | 
12 | import java.util.concurrent.Callable;
13 | 
14 | @Configuration
15 | public class AsyncInterceptorConfiguration extends WebMvcConfigurerAdapter {
16 | 
17 |   @Override
18 |   public void configureAsyncSupport(AsyncSupportConfigurer configurer) {
19 | 
20 |     configurer.setDefaultTimeout(30000L);
21 |     ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
22 |     taskExecutor.setThreadNamePrefix("my-mvc-async-");
23 |     taskExecutor.setCorePoolSize(400);
24 |     taskExecutor.setMaxPoolSize(400);
25 |     taskExecutor.setQueueCapacity(400);
26 |     taskExecutor.initialize();
27 |     configurer.setTaskExecutor(taskExecutor);
28 | 
29 |     configurer.registerCallableInterceptors(new CallableProcessingLogger());
30 |   }
31 | 
32 |   private static class CallableProcessingLogger implements CallableProcessingInterceptor {
33 | 
34 |     private static final Logger LOGGER = LoggerFactory.getLogger(CallableProcessingLogger.class);
35 | 
36 |     @Override
37 |     public <T> void beforeConcurrentHandling(NativeWebRequest request, Callable<T> task) throws Exception {
38 |       LOGGER.info("beforeConcurrentHandling");
39 |     }
40 | 
41 |     @Override
42 |     public <T> void preProcess(NativeWebRequest request, Callable<T> task) throws Exception {
43 |       LOGGER.info("preProcess");
44 | 
45 |     }
46 | 
47 |     @Override
48 |     public <T> void postProcess(NativeWebRequest request, Callable<T> task, Object concurrentResult) throws Exception {
49 |       LOGGER.info("postProcess");
50 |     }
51 | 
52 |     @Override
53 |     public <T> Object handleTimeout(NativeWebRequest request, Callable<T> task) throws Exception {
54 |       LOGGER.info("handleTimeout");
55 |       return null;
56 |     }
57 | 
58 |     @Override
59 |     public <T> void afterCompletion(NativeWebRequest request, Callable<T> task) throws Exception {
60 |       LOGGER.info("afterCompletion");
61 | 
62 |     }
63 |   }
64 | 
65 | }
66 | 


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/spring-mvc-async-io/src/main/java/me/chanjar/learning/slowjob/SlowJob.java:
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 1 | package me.chanjar.learning.slowjob;
 2 | 
 3 | public class SlowJob {
 4 | 
 5 |   private final String name;
 6 | 
 7 |   public SlowJob(String name) {
 8 |     this.name = name;
 9 |   }
10 | 
11 |   public String doWork() {
12 |     try {
13 |       Thread.sleep(1000L);
14 | 
15 |       return "Hi from " + name + ". Current Thread: " + Thread.currentThread().getName() + "\n";
16 |     } catch (InterruptedException e) {
17 |       e.printStackTrace();
18 |     }
19 |     return null;
20 | 
21 |   }
22 | 
23 | }
24 | 


--------------------------------------------------------------------------------
/spring-mvc-async-io/src/main/resources/application.properties:
--------------------------------------------------------------------------------
1 | logging.level.org.springframework.web=DEBUG
2 | spring.http.multipart.resolve-lazily=true
3 | 


--------------------------------------------------------------------------------
/spring-mvc-async-processing/README.md:
--------------------------------------------------------------------------------
  1 | # Spring MVC Async Processing
  2 | 
  3 | 本文讲到的所有特性皆是基于Servlet 3.0 Async Processing的，不是基于Servlet 3.1 Async IO的。
  4 | 
  5 | ## Callable<?>
  6 | 
  7 | > A ``Callable<?>`` can be returned when the application wants to produce the return value asynchronously in a thread managed by Spring MVC.
  8 | 
  9 | 用于异步返回结果，使用的是Spring MVC的``AsyncTaskExecutor``，Spring MVC使用``CallableMethodReturnValueHandler``负责处理它。
 10 | 
 11 | 下面是例子[CallableController][src-CallableController]：
 12 | 
 13 | ```java
 14 | @RestController
 15 | public class CallableController {
 16 | 
 17 |   @RequestMapping("callable-hello")
 18 |   public Callable<String> hello() {
 19 |     return () -> new SlowJob("CallableController").doWork();
 20 |   }
 21 | }
 22 | ```
 23 | 
 24 | 用浏览器访问：[http://localhost:8080/callable-hello][callable-hello] 查看返回结果。
 25 | 
 26 | ## DeferredResult<?>
 27 | 
 28 | > A ``DeferredResult<?>`` can be returned when the application wants to produce the return value from a thread of its own choosing.
 29 | 
 30 | 用于异步返回结果，使用的是client code自己的thread，Spring MVC使用``DeferredResultMethodReturnValueHandler``负责处理它。
 31 | 
 32 | 下面是例子[DeferredResultController][src-DeferredResultController]：
 33 | 
 34 | ```java
 35 | @RestController
 36 | public class DeferredResultController {
 37 | 
 38 |   @Autowired
 39 |   @Qualifier("customExecutorService")
 40 |   private ExecutorService executorService;
 41 | 
 42 |   @RequestMapping("deferred-result-hello")
 43 |   public DeferredResult<String> hello() {
 44 |     DeferredResult<String> deferredResult = new DeferredResult<>();
 45 |     executorService.submit(() -> {
 46 |       try {
 47 |         deferredResult.setResult(new SlowJob("DeferredResultController").doWork());
 48 |       } catch (Exception e) {
 49 |         deferredResult.setErrorResult(e);
 50 |       }
 51 | 
 52 |     });
 53 |     return deferredResult;
 54 |   }
 55 | 
 56 | }
 57 | ```
 58 | 
 59 | 在这个例子里使用了ExecutorService（见[ExecutorServiceConfiguration][src-ExecutorServiceConfiguration]），你也可以根据实际情况采用别的机制来给``DeferredResult.setResult``。
 60 | 
 61 | 用浏览器访问：[http://localhost:8080/deferred-result-hello][deferred-result-hello] 查看返回结果。
 62 | 
 63 | ## ListenableFuture<?> or CompletableFuture<?>/CompletionStage<?>
 64 | 
 65 | > A ``ListenableFuture<?>`` or ``CompletableFuture<?>``/``CompletionStage<?>`` can be returned when the application wants to produce the value from a thread pool submission.
 66 | 
 67 | 用于异步返回结果，使用client code自己的thread pool，Spring MVC使用``DeferredResultMethodReturnValueHandler``负责处理它。
 68 | 
 69 | 下面是例子[ListenableFutureController][src-ListenableFutureController]：
 70 | 
 71 | ```java
 72 | @RestController
 73 | public class ListenableFutureController {
 74 | 
 75 |   @Autowired
 76 |   @Qualifier("customExecutorService")
 77 |   private ExecutorService executorService;
 78 | 
 79 |   @RequestMapping("listenable-future-hello")
 80 |   public ListenableFutureTask<String> hello() {
 81 | 
 82 |     ListenableFutureTask<String> listenableFutureTask = new ListenableFutureTask<>(
 83 |         () -> new SlowJob("ListenableFutureController").doWork());
 84 |     executorService.submit(listenableFutureTask);
 85 |     return listenableFutureTask;
 86 |   }
 87 | 
 88 | }
 89 | ```
 90 | 
 91 | 用浏览器访问：[http://localhost:8080/listenable-future-hello][listenable-future-hello] 查看返回结果。
 92 | 
 93 | 下面是例子[CompletionFutureController][src-CompletionFutureController]
 94 | 
 95 | ```java
 96 | @RestController
 97 | public class CompletionFutureController {
 98 | 
 99 |   @RequestMapping("completable-future-hello")
100 |   public CompletableFuture<String> hello() {
101 | 
102 |     return CompletableFuture
103 |         .supplyAsync(() -> new SlowJob("CompletionFutureController").doWork());
104 |   }
105 | 
106 | }
107 | ```
108 | 
109 | 用浏览器访问：[http://localhost:8080/completable-future-hello][completable-future-hello] 查看返回结果。
110 | 
111 | ## ResponseBodyEmitter
112 | 
113 | > A [ResponseBodyEmitter][ref-7] can be returned to write multiple objects to the response asynchronously; also supported as the body within a ``ResponseEntity``.
114 | 
115 | 用于异步的写入多个消息，使用的是client code自己的thread，Spring MVC使用``ResponseBodyEmitterReturnValueHandler``负责处理它。
116 | 
117 | 下面是例子[ResponseBodyEmitterController][src-ResponseBodyEmitterController]
118 | 
119 | ```java
120 | @RestController
121 | public class ResponseBodyEmitterController {
122 | 
123 |   @Autowired
124 |   @Qualifier("customExecutorService")
125 |   private ExecutorService executorService;
126 | 
127 |   @RequestMapping("response-body-emitter-hello")
128 |   public ResponseBodyEmitter hello() {
129 | 
130 |     ResponseBodyEmitter emitter = new ResponseBodyEmitter();
131 |     executorService.submit(() -> {
132 |       try {
133 |         for (int i = 0; i < 5; i++) {
134 | 
135 |           String hello = new SlowJob("ResponseBodyEmitterController").doWork();
136 |           emitter.send("Count: " + (i + 1));
137 |           emitter.send("\n");
138 |           emitter.send(hello);
139 |           emitter.send("\n\n");
140 |         }
141 |         emitter.complete();
142 |       } catch (Exception e) {
143 |         emitter.completeWithError(e);
144 |       }
145 | 
146 |     });
147 | 
148 |     return emitter;
149 |   }
150 | }
151 | ```
152 | 
153 | 用浏览器访问：[http://localhost:8080/response-body-emitter-hello][response-body-emitter-hello] 查看返回结果。
154 | 
155 | ## SseEmitter
156 | 
157 | > An [SseEmitter][ref-8] can be returned to write Server-Sent Events to the response asynchronously; also supported as the body within a ``ResponseEntity``.
158 | 
159 | 作用和`ResponseBodyEmitter`类似，也是异步的写入多个消息，使用的是client code自己的thread，区别在于它使用的是[Server-Sent Events][w3-1]。Spring MVC使用``ResponseBodyEmitterReturnValueHandler``负责处理它。
160 | 
161 | 下面是例子[SseEmitterController][src-SseEmitterController]
162 | 
163 | ```java
164 | @RestController
165 | public class SseEmitterController {
166 | 
167 |   @Autowired
168 |   @Qualifier("customExecutorService")
169 |   private ExecutorService executorService;
170 | 
171 |   @RequestMapping("sse-emitter-hello")
172 |   public ResponseBodyEmitter hello() {
173 | 
174 |     SseEmitter emitter = new SseEmitter();
175 |     executorService.submit(() -> {
176 |       try {
177 |         for (int i = 0; i < 5; i++) {
178 | 
179 |           String hello = new SlowJob("SseEmitterController").doWork();
180 |           StringBuilder sb = new StringBuilder();
181 |           sb.append("Count: " + (i + 1)).append(". ").append(hello.replace("\n", ""));
182 |           emitter.send(sb.toString());
183 |         }
184 |         emitter.complete();
185 |       } catch (Exception e) {
186 |         emitter.completeWithError(e);
187 |       }
188 | 
189 |     });
190 | 
191 |     return emitter;
192 |   }
193 | }
194 | ```
195 | 
196 | 用浏览器访问：[http://localhost:8080/sse-emitter-hello][sse-emitter-hello] 查看返回结果。
197 | 
198 | ## StreamingResponseBody
199 | 
200 | > A [StreamingResponseBody][ref-9] can be returned to write to the response OutputStream asynchronously; also supported as the body within a ``ResponseEntity``.
201 | 
202 | 用于异步write outputStream，使用的是Spring MVC的``AsyncTaskExecutor``，Spring MVC使用``StreamingResponseBodyReturnValueHandler``负责处理它。要注意，Spring MVC并没有使用Servlet 3.1 Async IO（\[Read|Write\]Listener）。
203 | 
204 | 下面是例子[StreamingResponseBodyController][src-StreamingResponseBodyController]
205 | 
206 | ```java
207 | @RestController
208 | public class StreamingResponseBodyController {
209 | 
210 |   @RequestMapping("streaming-response-body-hello")
211 |   public StreamingResponseBody hello() {
212 | 
213 |     return outputStream -> {
214 |       String hello = new SlowJob("CallableController").doWork();
215 |       outputStream.write(hello.getBytes());
216 |       outputStream.flush();
217 |     };
218 | 
219 |   }
220 | }
221 | ```
222 | 
223 | 用浏览器访问：[http://localhost:8080/streaming-response-body-hello][streaming-response-body-hello] 查看返回结果。
224 | 
225 | 
226 | ## 配置MVC Async
227 | 
228 | ### AsyncTaskExecutor
229 | 
230 | Spring MVC执行异步操作需要用到``AsyncTaskExecutor``，这个可以在用``WebMvcConfigurer.configureAsyncSupport``方法来提供（[相关文档][ref-5]）。
231 | 如果不提供，则使用``SimpleAsyncTaskExecutor``，``SimpleAsyncTaskExecutor``不使用thread pool，因此推荐提供自定义的``AsyncTaskExecutor``。
232 | 
233 | 需要注意的是``@EnableAsync``也需要用到``AsyncTaskExecutor``，不过Spring MVC和它用的不是同一个。
234 | 顺带一提，``EnableAsync``默认也使用``SimpleAsyncTaskExecutor``，可以使用``AsyncConfigurer.getAsyncExecutor``方法来提供一个自定义的``AsyncTaskExecutor``。
235 | 
236 | 例子见：[MvcAsyncTaskExecutorConfigurer][src-MvcAsyncTaskExecutorConfigurer]。
237 | 
238 | ### Interceptors
239 | 
240 | * ``AsyncHandlerInterceptor``，使用``WebMvcConfigurer.addInterceptors``注册
241 | * ``CallableProcessingInterceptor[Adapter]``，使用``WebMvcConfigurer.configureAsyncSupport``注册
242 | * ``DeferredResultProcessingInterceptor[Adapter]``，使用``WebMvcConfigurer.configureAsyncSupport``注册
243 | 
244 | 官方文档：[Intercepting Async Requests][ref-6]
245 | 
246 | ## WebAsyncManager
247 | 
248 | ``WebAsyncManager``是Spring MVC管理async processing的中心类，如果你可以阅读它的源码来更多了解Spring MVC对于async processing的底层机制。
249 | 
250 | ## 参考资料
251 | 
252 | * [Spring Web MVC Doc - Supported method return values][ref-1]
253 | * [Spring Web MVC Doc - Asynchronous Request Processing][ref-2]
254 | * [Spring Web MVC Doc - Configuring Asynchronous Request Processing][ref-3]
255 | * [Configuring Spring MVC Async Threads][ref-4]
256 | 
257 | * [Spring MVC 3.2 Preview: Introducing Servlet 3, Async Support][blog-1]
258 | * [Spring MVC 3.2 Preview: Techniques for Real-time Updates][blog-2]
259 | * [Spring MVC 3.2 Preview: Making a Controller Method Asynchronous][blog-3]
260 | * [Spring MVC 3.2 Preview: Adding Long Polling to an Existing Web Application][blog-4]
261 | * [Spring MVC 3.2 Preview: Chat Sample][blog-5]
262 | 
263 | [ref-1]: https://docs.spring.io/spring/docs/4.3.9.RELEASE/spring-framework-reference/html/mvc.html#mvc-ann-return-types
264 | [ref-2]: https://docs.spring.io/spring/docs/4.3.9.RELEASE/spring-framework-reference/html/mvc.html#mvc-ann-async
265 | [ref-3]: https://docs.spring.io/spring/docs/4.3.9.RELEASE/spring-framework-reference/html/mvc.html#mvc-ann-async-configuration
266 | [ref-4]: http://www.clianz.com/2016/02/24/configuring-spring-mvc-async-threads/
267 | [ref-5]: https://docs.spring.io/spring/docs/4.3.9.RELEASE/spring-framework-reference/html/mvc.html#mvc-ann-async-configuration-spring-mvc
268 | [ref-6]: https://docs.spring.io/spring/docs/4.3.9.RELEASE/spring-framework-reference/html/mvc.html#mvc-ann-async-interception
269 | [ref-7]: https://docs.spring.io/spring/docs/4.3.9.RELEASE/spring-framework-reference/html/mvc.html#mvc-ann-async-http-streaming
270 | [ref-8]: https://docs.spring.io/spring/docs/4.3.9.RELEASE/spring-framework-reference/html/mvc.html#mvc-ann-async-sse
271 | [ref-9]: https://docs.spring.io/spring/docs/4.3.9.RELEASE/spring-framework-reference/html/mvc.html#mvc-ann-async-output-stream
272 | [w3-1]: https://www.w3.org/TR/eventsource/
273 | [blog-1]: https://spring.io/blog/2012/05/07/spring-mvc-3-2-preview-introducing-servlet-3-async-support
274 | [blog-2]: https://spring.io/blog/2012/05/08/spring-mvc-3-2-preview-techniques-for-real-time-updates/
275 | [blog-3]: https://spring.io/blog/2012/05/10/spring-mvc-3-2-preview-making-a-controller-method-asynchronous/
276 | [blog-4]: https://spring.io/blog/2012/05/14/spring-mvc-3-2-preview-adding-long-polling-to-an-existing-web-application
277 | [blog-5]: https://spring.io/blog/2012/05/16/spring-mvc-3-2-preview-chat-sample/
278 | [src-MvcAsyncTaskExecutorConfigurer]: src/main/java/me/chanjar/learning/config/MvcAsyncTaskExecutorConfigurer.java
279 | [src-ExecutorServiceConfiguration]: src/main/java/me/chanjar/learning/config/ExecutorServiceConfiguration.java
280 | [src-CallableController]: src/main/java/me/chanjar/learning/CallableController.java
281 | [src-DeferredResultController]: src/main/java/me/chanjar/learning/DeferredResultController.java
282 | [src-ListenableFutureController]: src/main/java/me/chanjar/learning/ListenableFutureController.java
283 | [src-CompletionFutureController]: src/main/java/me/chanjar/learning/CompletionFutureController.java
284 | [src-ResponseBodyEmitterController]: src/main/java/me/chanjar/learning/ResponseBodyEmitterController.java
285 | [src-SseEmitterController]: src/main/java/me/chanjar/learning/SseEmitterController.java
286 | [src-StreamingResponseBodyController]: src/main/java/me/chanjar/learning/StreamingResponseBodyController.java
287 | [callable-hello]: http://localhost:8080/callable-hello
288 | [completable-future-hello]: http://localhost:8080/completable-future-hello
289 | [deferred-result-hello]: http://localhost:8080/deferred-result-hello
290 | [listenable-future-hello]: http://localhost:8080/listenable-future-hello
291 | [sse-emitter-hello]: http://localhost:8080/sse-emitter-hello
292 | [response-body-emitter-hello]: http://localhost:8080/response-body-emitter-hello
293 | [streaming-response-body-hello]: http://localhost:8080/streaming-response-body-hello
294 | 


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/spring-mvc-async-processing/pom.xml:
--------------------------------------------------------------------------------
 1 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2 |          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 3 |   <modelVersion>4.0.0</modelVersion>
 4 | 
 5 |   <parent>
 6 |     <groupId>org.springframework.boot</groupId>
 7 |     <artifactId>spring-boot-starter-parent</artifactId>
 8 |     <version>1.5.9.RELEASE</version>
 9 |   </parent>
10 | 
11 |   <groupId>me.chanjar.learning</groupId>
12 |   <artifactId>spring-mvc-async-processing</artifactId>
13 |   <packaging>war</packaging>
14 | 
15 |   <properties>
16 |     <java.version>1.8</java.version>
17 |     <maven.compiler.source>1.8</maven.compiler.source>
18 |     <maven.compiler.target>1.8</maven.compiler.target>
19 |   </properties>
20 | 
21 | 
22 |   <dependencies>
23 |     <dependency>
24 |       <groupId>org.springframework.boot</groupId>
25 |       <artifactId>spring-boot-starter-thymeleaf</artifactId>
26 |     </dependency>
27 |     <dependency>
28 |       <groupId>org.springframework.boot</groupId>
29 |       <artifactId>spring-boot-devtools</artifactId>
30 |       <optional>true</optional>
31 |     </dependency>
32 |   </dependencies>
33 | 
34 |   <build>
35 |     <plugins>
36 |       <plugin>
37 |         <groupId>org.springframework.boot</groupId>
38 |         <artifactId>spring-boot-maven-plugin</artifactId>
39 |       </plugin>
40 |     </plugins>
41 |   </build>
42 | 
43 | </project>
44 | 


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/spring-mvc-async-processing/src/main/java/me/chanjar/learning/Application.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import org.springframework.boot.SpringApplication;
 4 | import org.springframework.boot.autoconfigure.SpringBootApplication;
 5 | import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 6 | 
 7 | @SpringBootApplication
 8 | @EnableWebMvc
 9 | public class Application {
10 | 
11 |   public static void main(String[] args) {
12 |     SpringApplication.run(Application.class, args);
13 |   }
14 | 
15 | }
16 | 


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/spring-mvc-async-processing/src/main/java/me/chanjar/learning/CallableController.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import me.chanjar.learning.slowjob.SlowJob;
 4 | import org.springframework.web.bind.annotation.RequestMapping;
 5 | import org.springframework.web.bind.annotation.RestController;
 6 | 
 7 | import java.util.concurrent.Callable;
 8 | 
 9 | @RestController
10 | public class CallableController {
11 | 
12 |   @RequestMapping("callable-hello")
13 |   public Callable<String> hello() {
14 |     return () -> new SlowJob("CallableController").doWork();
15 |   }
16 | }
17 | 


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/spring-mvc-async-processing/src/main/java/me/chanjar/learning/CompletionFutureController.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import me.chanjar.learning.slowjob.SlowJob;
 4 | import org.springframework.web.bind.annotation.RequestMapping;
 5 | import org.springframework.web.bind.annotation.RestController;
 6 | 
 7 | import java.util.concurrent.CompletableFuture;
 8 | 
 9 | @RestController
10 | public class CompletionFutureController {
11 | 
12 |   @RequestMapping("completable-future-hello")
13 |   public CompletableFuture<String> hello() {
14 | 
15 |     return CompletableFuture
16 |         .supplyAsync(() -> new SlowJob("CompletionFutureController").doWork());
17 |   }
18 | 
19 | }
20 | 


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/spring-mvc-async-processing/src/main/java/me/chanjar/learning/DeferredResultController.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import me.chanjar.learning.slowjob.SlowJob;
 4 | import org.springframework.beans.factory.annotation.Autowired;
 5 | import org.springframework.beans.factory.annotation.Qualifier;
 6 | import org.springframework.web.bind.annotation.RequestMapping;
 7 | import org.springframework.web.bind.annotation.RestController;
 8 | import org.springframework.web.context.request.async.DeferredResult;
 9 | 
10 | import java.util.concurrent.ExecutorService;
11 | 
12 | @RestController
13 | public class DeferredResultController {
14 | 
15 |   @Autowired
16 |   @Qualifier("customExecutorService")
17 |   private ExecutorService executorService;
18 | 
19 |   @RequestMapping("deferred-result-hello")
20 |   public DeferredResult<String> hello() {
21 |     DeferredResult<String> deferredResult = new DeferredResult<>();
22 |     executorService.submit(() -> {
23 |       try {
24 |         deferredResult.setResult(new SlowJob("DeferredResultController").doWork());
25 |       } catch (Exception e) {
26 |         deferredResult.setErrorResult(e);
27 |       }
28 | 
29 |     });
30 |     return deferredResult;
31 |   }
32 | 
33 | }
34 | 


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/spring-mvc-async-processing/src/main/java/me/chanjar/learning/ListenableFutureController.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import me.chanjar.learning.slowjob.SlowJob;
 4 | import org.springframework.beans.factory.annotation.Autowired;
 5 | import org.springframework.beans.factory.annotation.Qualifier;
 6 | import org.springframework.util.concurrent.ListenableFutureTask;
 7 | import org.springframework.web.bind.annotation.RequestMapping;
 8 | import org.springframework.web.bind.annotation.RestController;
 9 | 
10 | import java.util.concurrent.ExecutorService;
11 | 
12 | @RestController
13 | public class ListenableFutureController {
14 | 
15 |   @Autowired
16 |   @Qualifier("customExecutorService")
17 |   private ExecutorService executorService;
18 | 
19 |   @RequestMapping("listenable-future-hello")
20 |   public ListenableFutureTask<String> hello() {
21 | 
22 |     ListenableFutureTask<String> listenableFutureTask = new ListenableFutureTask<>(
23 |         () -> new SlowJob("ListenableFutureController").doWork());
24 |     executorService.submit(listenableFutureTask);
25 |     return listenableFutureTask;
26 |   }
27 | 
28 | }
29 | 


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/spring-mvc-async-processing/src/main/java/me/chanjar/learning/ResponseBodyEmitterController.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import me.chanjar.learning.slowjob.SlowJob;
 4 | import org.springframework.beans.factory.annotation.Autowired;
 5 | import org.springframework.beans.factory.annotation.Qualifier;
 6 | import org.springframework.web.bind.annotation.RequestMapping;
 7 | import org.springframework.web.bind.annotation.RestController;
 8 | import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyEmitter;
 9 | 
10 | import java.util.concurrent.ExecutorService;
11 | 
12 | @RestController
13 | public class ResponseBodyEmitterController {
14 | 
15 |   @Autowired
16 |   @Qualifier("customExecutorService")
17 |   private ExecutorService executorService;
18 | 
19 |   @RequestMapping("response-body-emitter-hello")
20 |   public ResponseBodyEmitter hello() {
21 | 
22 |     ResponseBodyEmitter emitter = new ResponseBodyEmitter();
23 |     executorService.submit(() -> {
24 |       try {
25 |         for (int i = 0; i < 5; i++) {
26 | 
27 |           String hello = new SlowJob("ResponseBodyEmitterController").doWork();
28 |           emitter.send("Count: " + (i + 1));
29 |           emitter.send("\n");
30 |           emitter.send(hello);
31 |           emitter.send("\n\n");
32 |         }
33 |         emitter.complete();
34 |       } catch (Exception e) {
35 |         emitter.completeWithError(e);
36 |       }
37 | 
38 |     });
39 | 
40 |     return emitter;
41 |   }
42 | }
43 | 


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/spring-mvc-async-processing/src/main/java/me/chanjar/learning/SseEmitterController.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import me.chanjar.learning.slowjob.SlowJob;
 4 | import org.springframework.beans.factory.annotation.Autowired;
 5 | import org.springframework.beans.factory.annotation.Qualifier;
 6 | import org.springframework.web.bind.annotation.RequestMapping;
 7 | import org.springframework.web.bind.annotation.RestController;
 8 | import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyEmitter;
 9 | import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
10 | 
11 | import java.util.concurrent.ExecutorService;
12 | 
13 | @RestController
14 | public class SseEmitterController {
15 | 
16 |   @Autowired
17 |   @Qualifier("customExecutorService")
18 |   private ExecutorService executorService;
19 | 
20 |   @RequestMapping("sse-emitter-hello")
21 |   public ResponseBodyEmitter hello() {
22 | 
23 |     SseEmitter emitter = new SseEmitter();
24 |     executorService.submit(() -> {
25 |       try {
26 |         for (int i = 0; i < 5; i++) {
27 | 
28 |           String hello = new SlowJob("SseEmitterController").doWork();
29 |           StringBuilder sb = new StringBuilder();
30 |           sb.append("Count: " + (i + 1)).append(". ").append(hello.replace("\n", ""));
31 |           emitter.send(sb.toString());
32 |         }
33 |         emitter.complete();
34 |       } catch (Exception e) {
35 |         emitter.completeWithError(e);
36 |       }
37 | 
38 |     });
39 | 
40 |     return emitter;
41 |   }
42 | }
43 | 


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/spring-mvc-async-processing/src/main/java/me/chanjar/learning/StreamingResponseBodyController.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import me.chanjar.learning.slowjob.SlowJob;
 4 | import org.springframework.web.bind.annotation.RequestMapping;
 5 | import org.springframework.web.bind.annotation.RestController;
 6 | import org.springframework.web.servlet.mvc.method.annotation.StreamingResponseBody;
 7 | 
 8 | import java.io.IOException;
 9 | import java.io.OutputStream;
10 | 
11 | @RestController
12 | public class StreamingResponseBodyController {
13 | 
14 |   @RequestMapping("streaming-response-body-hello")
15 |   public StreamingResponseBody hello() {
16 | 
17 |     return outputStream -> {
18 |       String hello = new SlowJob("CallableController").doWork();
19 |       outputStream.write(hello.getBytes());
20 |       outputStream.flush();
21 |     };
22 | 
23 |   }
24 | }
25 | 


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/spring-mvc-async-processing/src/main/java/me/chanjar/learning/config/ExecutorServiceConfiguration.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning.config;
 2 | 
 3 | import org.springframework.context.Lifecycle;
 4 | import org.springframework.context.annotation.Bean;
 5 | import org.springframework.context.annotation.Configuration;
 6 | 
 7 | import java.util.concurrent.ExecutorService;
 8 | import java.util.concurrent.Executors;
 9 | import java.util.concurrent.ThreadFactory;
10 | import java.util.concurrent.TimeUnit;
11 | import java.util.concurrent.atomic.AtomicInteger;
12 | 
13 | @Configuration
14 | public class ExecutorServiceConfiguration {
15 | 
16 |   @Bean
17 |   public ExecutorService customExecutorService() {
18 |     return Executors.newFixedThreadPool(400, new ThreadFactory() {
19 |       private final AtomicInteger threadNumber = new AtomicInteger(1);
20 | 
21 |       @Override
22 |       public Thread newThread(Runnable r) {
23 |         return new Thread(r, "my-executor-service-" + threadNumber.getAndIncrement());
24 |       }
25 |     });
26 | 
27 |   }
28 | 
29 |   @Bean
30 |   public Lifecycle customExecutorServiceLifeCycle() {
31 | 
32 |     final ExecutorService executorService = customExecutorService();
33 |     return new Lifecycle() {
34 | 
35 |       @Override
36 |       public void start() {
37 | 
38 |       }
39 | 
40 |       @Override
41 |       public void stop() {
42 | 
43 |         executorService.shutdown();
44 |         boolean successfulTerminated = false;
45 |         try {
46 |           successfulTerminated = executorService.awaitTermination(5, TimeUnit.SECONDS);
47 |         } catch (InterruptedException e) {
48 |           e.printStackTrace();
49 |         }
50 |         if (!successfulTerminated) {
51 |           executorService.shutdownNow();
52 |         }
53 | 
54 |       }
55 | 
56 |       @Override
57 |       public boolean isRunning() {
58 |         return !executorService.isTerminated();
59 |       }
60 | 
61 |     };
62 |   }
63 | }
64 | 


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/spring-mvc-async-processing/src/main/java/me/chanjar/learning/config/MvcAsyncTaskExecutorConfigurer.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning.config;
 2 | 
 3 | import org.springframework.context.annotation.Configuration;
 4 | import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
 5 | import org.springframework.web.servlet.config.annotation.AsyncSupportConfigurer;
 6 | import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
 7 | 
 8 | @Configuration
 9 | public class MvcAsyncTaskExecutorConfigurer extends WebMvcConfigurerAdapter {
10 | 
11 |   @Override
12 |   public void configureAsyncSupport(AsyncSupportConfigurer configurer) {
13 | 
14 |     configurer.setDefaultTimeout(30000L);
15 |     ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
16 |     taskExecutor.setThreadNamePrefix("my-mvc-async-");
17 |     taskExecutor.setCorePoolSize(400);
18 |     taskExecutor.setMaxPoolSize(400);
19 |     taskExecutor.setQueueCapacity(400);
20 |     taskExecutor.initialize();
21 |     configurer.setTaskExecutor(taskExecutor);
22 | 
23 |   }
24 | 
25 | }
26 | 


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/spring-mvc-async-processing/src/main/java/me/chanjar/learning/slowjob/SlowJob.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning.slowjob;
 2 | 
 3 | public class SlowJob {
 4 | 
 5 |   private final String name;
 6 | 
 7 |   public SlowJob(String name) {
 8 |     this.name = name;
 9 |   }
10 | 
11 |   public String doWork() {
12 |     try {
13 |       Thread.sleep(1000L);
14 | 
15 |       return "Hi from " + name + ". Current Thread: " + Thread.currentThread().getName() + "\n";
16 |     } catch (InterruptedException e) {
17 |       e.printStackTrace();
18 |     }
19 |     return null;
20 | 
21 |   }
22 | 
23 | }
24 | 


--------------------------------------------------------------------------------
/tomcat-start/pom.xml:
--------------------------------------------------------------------------------
 1 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2 |   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 3 |   <modelVersion>4.0.0</modelVersion>
 4 | 
 5 |   <parent>
 6 |     <groupId>me.chanjar.learning</groupId>
 7 |     <artifactId>web-async-learn-aggregator</artifactId>
 8 |     <version>1.0-SNAPSHOT</version>
 9 |   </parent>
10 | 
11 |   <groupId>me.chanjar.learning</groupId>
12 |   <artifactId>tomcat-start</artifactId>
13 |   <packaging>jar</packaging>
14 | 
15 |   <properties>
16 |     <tomcat.version>8.5.23</tomcat.version>
17 |     <tomcat-juli.version>8.5.2</tomcat-juli.version>
18 |   </properties>
19 | 
20 | 
21 |   <dependencies>
22 | 
23 |     <dependency>
24 |       <groupId>org.apache.tomcat.embed</groupId>
25 |       <artifactId>tomcat-embed-core</artifactId>
26 |       <version>${tomcat.version}</version>
27 |     </dependency>
28 |     <dependency>
29 |       <groupId>org.apache.tomcat.embed</groupId>
30 |       <artifactId>tomcat-embed-logging-juli</artifactId>
31 |       <version>${tomcat-juli.version}</version>
32 |     </dependency>
33 |     <dependency>
34 |       <groupId>org.apache.tomcat.embed</groupId>
35 |       <artifactId>tomcat-embed-jasper</artifactId>
36 |       <version>${tomcat.version}</version>
37 |     </dependency>
38 |     <dependency>
39 |       <groupId>org.apache.tomcat</groupId>
40 |       <artifactId>tomcat-jasper</artifactId>
41 |       <version>${tomcat.version}</version>
42 |     </dependency>
43 |     <dependency>
44 |       <groupId>org.apache.tomcat</groupId>
45 |       <artifactId>tomcat-jasper-el</artifactId>
46 |       <version>${tomcat.version}</version>
47 |     </dependency>
48 |     <dependency>
49 |       <groupId>org.apache.tomcat</groupId>
50 |       <artifactId>tomcat-jsp-api</artifactId>
51 |       <version>${tomcat.version}</version>
52 |     </dependency>
53 | 
54 |   </dependencies>
55 | </project>
56 | 


--------------------------------------------------------------------------------
/tomcat-start/src/main/java/me/chanjar/learning/TomcatStart.java:
--------------------------------------------------------------------------------
 1 | package me.chanjar.learning;
 2 | 
 3 | import org.apache.catalina.WebResourceRoot;
 4 | import org.apache.catalina.core.StandardContext;
 5 | import org.apache.catalina.startup.Tomcat;
 6 | import org.apache.catalina.webresources.DirResourceSet;
 7 | import org.apache.catalina.webresources.StandardRoot;
 8 | 
 9 | import java.io.File;
10 | 
11 | /**
12 |  * https://devcenter.heroku.com/articles/create-a-java-web-application-using-embedded-tomcat
13 |  */
14 | public class TomcatStart {
15 | 
16 |   public static void start() throws Exception {
17 | 
18 |     String webappDirLocation = "src/main/webapp/";
19 |     Tomcat tomcat = new Tomcat();
20 | 
21 |     //The port that we should run on can be set into an environment variable
22 |     //Look for that variable and default to 8080 if it isn't there.
23 |     String webPort = System.getenv("PORT");
24 |     if (webPort == null || webPort.isEmpty()) {
25 |       webPort = "8080";
26 |     }
27 | 
28 |     tomcat.setPort(Integer.valueOf(webPort));
29 | 
30 |     StandardContext ctx = (StandardContext) tomcat.addWebapp("/", new File(webappDirLocation).getAbsolutePath());
31 |     System.out.println("configuring app with basedir: " + new File("./" + webappDirLocation).getAbsolutePath());
32 | 
33 |     // Declare an alternative location for your "WEB-INF/classes" dir
34 |     // Servlet 3.0 annotation will work
35 |     File additionWebInfClasses = new File("target/classes");
36 |     WebResourceRoot resources = new StandardRoot(ctx);
37 |     resources.addPreResources(new DirResourceSet(resources, "/WEB-INF/classes",
38 |         additionWebInfClasses.getAbsolutePath(), "/"));
39 |     ctx.setResources(resources);
40 | 
41 |     tomcat.start();
42 |     tomcat.getServer().await();
43 |   }
44 | 
45 | }
46 | 


--------------------------------------------------------------------------------