├── .gitignore ├── LICENSE ├── README.md ├── build.gradle ├── gradle └── wrapper │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── src ├── main ├── java │ └── com │ │ └── thekirschners │ │ └── springbootsamples │ │ ├── DemoApplication.java │ │ └── reactiveupload │ │ ├── CloseCondition.java │ │ └── ReactiveUploadResource.java └── resources │ └── application.properties └── test └── java └── com └── thekirschners └── springbootsamples └── DemoApplicationTests.java /.gitignore: -------------------------------------------------------------------------------- 1 | # Compiled class file 2 | *.class 3 | build 4 | out 5 | 6 | # IntelliJ 7 | *.ipr 8 | *.iws 9 | *.iml 10 | 11 | # Log file 12 | *.log 13 | 14 | # BlueJ files 15 | *.ctxt 16 | 17 | # Mobile Tools for Java (J2ME) 18 | .mtj.tmp/ 19 | 20 | # Package Files # 21 | *.jar 22 | *.war 23 | *.ear 24 | *.zip 25 | *.tar.gz 26 | *.rar 27 | 28 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml 29 | hs_err_pid* 30 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 31 | DEFAULT_JVM_OPTS="" 32 | 33 | # Use the maximum available, or set MAX_FD != -1 to use that value. 34 | MAX_FD="maximum" 35 | 36 | warn ( ) { 37 | echo "$*" 38 | } 39 | 40 | die ( ) { 41 | echo 42 | echo "$*" 43 | echo 44 | exit 1 45 | } 46 | 47 | # OS specific support (must be 'true' or 'false'). 48 | cygwin=false 49 | msys=false 50 | darwin=false 51 | nonstop=false 52 | case "`uname`" in 53 | CYGWIN* ) 54 | cygwin=true 55 | ;; 56 | Darwin* ) 57 | darwin=true 58 | ;; 59 | MINGW* ) 60 | msys=true 61 | ;; 62 | NONSTOP* ) 63 | nonstop=true 64 | ;; 65 | esac 66 | 67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 68 | 69 | # Determine the Java command to use to start the JVM. 70 | if [ -n "$JAVA_HOME" ] ; then 71 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 72 | # IBM's JDK on AIX uses strange locations for the executables 73 | JAVACMD="$JAVA_HOME/jre/sh/java" 74 | else 75 | JAVACMD="$JAVA_HOME/bin/java" 76 | fi 77 | if [ ! -x "$JAVACMD" ] ; then 78 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 79 | 80 | Please set the JAVA_HOME variable in your environment to match the 81 | location of your Java installation." 82 | fi 83 | else 84 | JAVACMD="java" 85 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 86 | 87 | Please set the JAVA_HOME variable in your environment to match the 88 | location of your Java installation." 89 | fi 90 | 91 | # Increase the maximum file descriptors if we can. 92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 93 | MAX_FD_LIMIT=`ulimit -H -n` 94 | if [ $? -eq 0 ] ; then 95 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 96 | MAX_FD="$MAX_FD_LIMIT" 97 | fi 98 | ulimit -n $MAX_FD 99 | if [ $? -ne 0 ] ; then 100 | warn "Could not set maximum file descriptor limit: $MAX_FD" 101 | fi 102 | else 103 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 104 | fi 105 | fi 106 | 107 | # For Darwin, add options to specify how the application appears in the dock 108 | if $darwin; then 109 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 110 | fi 111 | 112 | # For Cygwin, switch paths to Windows format before running java 113 | if $cygwin ; then 114 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 115 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 116 | JAVACMD=`cygpath --unix "$JAVACMD"` 117 | 118 | # We build the pattern for arguments to be converted via cygpath 119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 120 | SEP="" 121 | for dir in $ROOTDIRSRAW ; do 122 | ROOTDIRS="$ROOTDIRS$SEP$dir" 123 | SEP="|" 124 | done 125 | OURCYGPATTERN="(^($ROOTDIRS))" 126 | # Add a user-defined pattern to the cygpath arguments 127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 129 | fi 130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 131 | i=0 132 | for arg in "$@" ; do 133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 135 | 136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 138 | else 139 | eval `echo args$i`="\"$arg\"" 140 | fi 141 | i=$((i+1)) 142 | done 143 | case $i in 144 | (0) set -- ;; 145 | (1) set -- "$args0" ;; 146 | (2) set -- "$args0" "$args1" ;; 147 | (3) set -- "$args0" "$args1" "$args2" ;; 148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 154 | esac 155 | fi 156 | 157 | # Escape application args 158 | save ( ) { 159 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 160 | echo " " 161 | } 162 | APP_ARGS=$(save "$@") 163 | 164 | # Collect all arguments for the java command, following the shell quoting and substitution rules 165 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 166 | 167 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong 168 | if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then 169 | cd "$(dirname "$0")" 170 | fi 171 | 172 | exec "$JAVACMD" "$@" 173 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | set DIRNAME=%~dp0 12 | if "%DIRNAME%" == "" set DIRNAME=. 13 | set APP_BASE_NAME=%~n0 14 | set APP_HOME=%DIRNAME% 15 | 16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 17 | set DEFAULT_JVM_OPTS= 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windows variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | 53 | :win9xME_args 54 | @rem Slurp the command line arguments. 55 | set CMD_LINE_ARGS= 56 | set _SKIP=2 57 | 58 | :win9xME_args_slurp 59 | if "x%~1" == "x" goto execute 60 | 61 | set CMD_LINE_ARGS=%* 62 | 63 | :execute 64 | @rem Setup the command line 65 | 66 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 67 | 68 | @rem Execute Gradle 69 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 70 | 71 | :end 72 | @rem End local scope for the variables with windows NT shell 73 | if "%ERRORLEVEL%"=="0" goto mainEnd 74 | 75 | :fail 76 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 77 | rem the _cmd.exe /c_ return code! 78 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 79 | exit /b 1 80 | 81 | :mainEnd 82 | if "%OS%"=="Windows_NT" endlocal 83 | 84 | :omega 85 | -------------------------------------------------------------------------------- /src/main/java/com/thekirschners/springbootsamples/DemoApplication.java: -------------------------------------------------------------------------------- 1 | package com.thekirschners.springbootsamples; 2 | 3 | import org.springframework.boot.SpringApplication; 4 | import org.springframework.boot.autoconfigure.SpringBootApplication; 5 | 6 | @SpringBootApplication 7 | public class DemoApplication { 8 | public static void main(String[] args) { 9 | SpringApplication.run(DemoApplication.class, args); 10 | } 11 | } 12 | -------------------------------------------------------------------------------- /src/main/java/com/thekirschners/springbootsamples/reactiveupload/CloseCondition.java: -------------------------------------------------------------------------------- 1 | package com.thekirschners.springbootsamples.reactiveupload; 2 | 3 | import org.slf4j.Logger; 4 | import org.slf4j.LoggerFactory; 5 | 6 | import java.util.concurrent.atomic.AtomicBoolean; 7 | import java.util.concurrent.atomic.AtomicInteger; 8 | 9 | class CloseCondition { 10 | Logger LOGGER = LoggerFactory.getLogger(CloseCondition.class); 11 | 12 | AtomicInteger tasksSubmitted = new AtomicInteger(0); 13 | AtomicInteger tasksCompleted = new AtomicInteger(0); 14 | AtomicBoolean allTaskssubmitted = new AtomicBoolean(false); 15 | 16 | /** 17 | * notify all tasks have been subitted, determine of the file channel can be closed 18 | * @return true if the asynchronous file stream can be closed 19 | */ 20 | public boolean canCloseOnComplete() { 21 | allTaskssubmitted.set(true); 22 | return tasksCompleted.get() == tasksSubmitted.get(); 23 | } 24 | 25 | /** 26 | * notify a task has been submitted 27 | */ 28 | public void onTaskSubmitted() { 29 | tasksSubmitted.incrementAndGet(); 30 | } 31 | 32 | /** 33 | * notify a task has been completed 34 | * @return true if the asynchronous file stream can be closed 35 | */ 36 | public boolean onTaskCompleted() { 37 | boolean allSubmittedClosed = tasksSubmitted.get() == tasksCompleted.incrementAndGet(); 38 | return allSubmittedClosed && allTaskssubmitted.get(); 39 | } 40 | } 41 | 42 | -------------------------------------------------------------------------------- /src/main/java/com/thekirschners/springbootsamples/reactiveupload/ReactiveUploadResource.java: -------------------------------------------------------------------------------- 1 | package com.thekirschners.springbootsamples.reactiveupload; 2 | 3 | import org.slf4j.Logger; 4 | import org.slf4j.LoggerFactory; 5 | import org.springframework.core.io.buffer.DataBuffer; 6 | import org.springframework.http.MediaType; 7 | import org.springframework.http.codec.multipart.FilePart; 8 | import org.springframework.http.codec.multipart.Part; 9 | import org.springframework.web.bind.annotation.RequestBody; 10 | import org.springframework.web.bind.annotation.RequestMapping; 11 | import org.springframework.web.bind.annotation.RequestMethod; 12 | import org.springframework.web.bind.annotation.RestController; 13 | import reactor.core.publisher.Flux; 14 | import reactor.core.publisher.Mono; 15 | 16 | import java.io.File; 17 | import java.io.IOException; 18 | import java.nio.ByteBuffer; 19 | import java.nio.channels.AsynchronousFileChannel; 20 | import java.nio.channels.CompletionHandler; 21 | import java.nio.file.StandardOpenOption; 22 | import java.util.concurrent.atomic.AtomicBoolean; 23 | import java.util.concurrent.atomic.AtomicInteger; 24 | 25 | /** 26 | * example to demonstrate fully reactive file upload using using SpringBoot2 WebFlux and NIO {@link AsynchronousFileChannel} 27 | */ 28 | @RestController 29 | @RequestMapping(path = "/api/reactive-upload") 30 | public class ReactiveUploadResource { 31 | Logger LOGGER = LoggerFactory.getLogger(ReactiveUploadResource.class); 32 | 33 | /** 34 | * upload handler method, mapped to POST. Like any file upload handler it consumes MULTIPART_FORM_DATA. 35 | * Produces a JSON respomse 36 | * 37 | * @param parts a flux providing all part contained in the MULTIPART_FORM_DATA request 38 | * @return a flux of results - one element per uploaded file 39 | */ 40 | @RequestMapping(method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE, produces = MediaType.APPLICATION_JSON_VALUE) 41 | public Flux uploadHandler(@RequestBody Flux parts) { 42 | return parts 43 | .filter(part -> part instanceof FilePart) // only retain file parts 44 | .ofType(FilePart.class) // convert the flux to FilePart 45 | .flatMap(this::saveFile); // save each file and flatmap it to a flux of results 46 | } 47 | 48 | /** 49 | * tske a {@link FilePart}, transfer it to disk using {@link AsynchronousFileChannel}s and return a {@link Mono} representing the result 50 | * 51 | * @param filePart - the request part containing the file to be saved 52 | * @return a {@link Mono} representing the result of the operation 53 | */ 54 | private Mono saveFile(FilePart filePart) { 55 | LOGGER.info("handling file upload {}", filePart.filename()); 56 | 57 | // if a file with the same name already exists in a repository, delete and recreate it 58 | final String filename = filePart.filename(); 59 | File file = new File(filename); 60 | if (file.exists()) 61 | file.delete(); 62 | try { 63 | file.createNewFile(); 64 | } catch (IOException e) { 65 | return Mono.error(e); // if creating a new file fails return an error 66 | } 67 | 68 | try { 69 | // create an async file channel to store the file on disk 70 | final AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(file.toPath(), StandardOpenOption.WRITE); 71 | 72 | final CloseCondition closeCondition = new CloseCondition(); 73 | 74 | // pointer to the end of file offset 75 | AtomicInteger fileWriteOffset = new AtomicInteger(0); 76 | // error signal 77 | AtomicBoolean errorFlag = new AtomicBoolean(false); 78 | 79 | LOGGER.info("subscribing to file parts"); 80 | // FilePart.content produces a flux of data buffers, each need to be written to the file 81 | return filePart.content().doOnEach(dataBufferSignal -> { 82 | if (dataBufferSignal.hasValue() && !errorFlag.get()) { 83 | // read data from the incoming data buffer into a file array 84 | DataBuffer dataBuffer = dataBufferSignal.get(); 85 | int count = dataBuffer.readableByteCount(); 86 | byte[] bytes = new byte[count]; 87 | dataBuffer.read(bytes); 88 | 89 | // create a file channel compatible byte buffer 90 | final ByteBuffer byteBuffer = ByteBuffer.allocate(count); 91 | byteBuffer.put(bytes); 92 | byteBuffer.flip(); 93 | 94 | // get the current write offset and increment by the buffer size 95 | final int filePartOffset = fileWriteOffset.getAndAdd(count); 96 | LOGGER.info("processing file part at offset {}", filePartOffset); 97 | // write the buffer to disk 98 | closeCondition.onTaskSubmitted(); 99 | fileChannel.write(byteBuffer, filePartOffset, null, new CompletionHandler() { 100 | @Override 101 | public void completed(Integer result, ByteBuffer attachment) { 102 | // file part successfuly written to disk, clean up 103 | LOGGER.info("done saving file part {}", filePartOffset); 104 | byteBuffer.clear(); 105 | 106 | if (closeCondition.onTaskCompleted()) 107 | try { 108 | LOGGER.info("closing after last part"); 109 | fileChannel.close(); 110 | } catch (IOException ignored) { 111 | ignored.printStackTrace(); 112 | } 113 | } 114 | 115 | @Override 116 | public void failed(Throwable exc, ByteBuffer attachment) { 117 | // there as an error while writing to disk, set an error flag 118 | errorFlag.set(true); 119 | LOGGER.info("error saving file part {}", filePartOffset); 120 | } 121 | }); 122 | } 123 | }).doOnComplete(() -> { 124 | // all done, close the file channel 125 | LOGGER.info("done processing file parts"); 126 | if (closeCondition.canCloseOnComplete()) 127 | try { 128 | LOGGER.info("closing after complete"); 129 | fileChannel.close(); 130 | } catch (IOException ignored) { 131 | } 132 | 133 | }).doOnError(t -> { 134 | // ooops there was an error 135 | LOGGER.info("error processing file parts"); 136 | try { 137 | fileChannel.close(); 138 | } catch (IOException ignored) { 139 | } 140 | // take last, map to a status string 141 | }).last().map(dataBuffer -> filePart.filename() + " " + (errorFlag.get() ? "error" : "uploaded")); 142 | } catch (IOException e) { 143 | // unable to open the file channel, return an error 144 | LOGGER.info("error opening the file channel"); 145 | return Mono.error(e); 146 | } 147 | } 148 | } -------------------------------------------------------------------------------- /src/main/resources/application.properties: -------------------------------------------------------------------------------- 1 | server.http2.enabled=true -------------------------------------------------------------------------------- /src/test/java/com/thekirschners/springbootsamples/DemoApplicationTests.java: -------------------------------------------------------------------------------- 1 | package com.thekirschners.springbootsamples; 2 | 3 | import org.junit.Test; 4 | import org.junit.runner.RunWith; 5 | import org.springframework.boot.test.context.SpringBootTest; 6 | import org.springframework.test.context.junit4.SpringRunner; 7 | 8 | @RunWith(SpringRunner.class) 9 | @SpringBootTest 10 | public class DemoApplicationTests { 11 | 12 | @Test 13 | public void contextLoads() { 14 | } 15 | 16 | } 17 | --------------------------------------------------------------------------------