├── .gitignore ├── Makefile ├── README.md ├── build.gradle ├── gradle.properties ├── gradle └── wrapper │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── settings.gradle └── src ├── docker └── Dockerfile └── main └── java └── io └── github └── rodrigovedovato └── letty ├── JettyServer.java ├── handlers └── HelloWorldHandler.java └── infrastructure └── LoomThreadPool.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 | *.nar 17 | *.ear 18 | *.zip 19 | *.tar.gz 20 | *.rar 21 | 22 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml 23 | hs_err_pid* 24 | 25 | .idea/ 26 | .gradle/ 27 | .settings/ 28 | 29 | bin/ 30 | build/ 31 | 32 | .classpath 33 | .project 34 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | jar: 2 | ./gradlew shadowJar 3 | 4 | docker: jar 5 | cd src/docker/ && cp ../../build/libs/letty-all.jar . && docker build -t letty:$(appVersion) . 6 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## Jetty API using Project Loom a.k.a "Letty" 2 | 3 | This is a sample API that uses Jetty to expose an endpoint showcasing how to use Project Loom's virtual threads 4 | in a real scenario 5 | 6 | For testing purposes, the application can be started in two different modes: `loom` and `standard`. Just set the 7 | `SERVER_MODE` environment variable to one of these values! 8 | 9 | You can also generate a docker image from this application. 10 | Just execute `make docker appVersion={version-you-want-to-generate}` -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | plugins { 2 | id 'java' 3 | id 'application' 4 | id 'com.github.johnrengelman.shadow' version '6.0.0' 5 | } 6 | 7 | assert hasProperty('javaHome'): "Set the property 'javaHome' in your your gradle.properties pointing to a Java 6 or 7 installation" 8 | assert hasProperty('targetJavaVersion'): "Set the property 'targetJavaVersion' in your your gradle.properties to '1.6' or '1.7'" 9 | 10 | java { 11 | sourceCompatibility = JavaVersion.toVersion(targetJavaVersion) 12 | } 13 | 14 | def javaExecutablesPath = new File(javaHome, 'bin') 15 | def javaExecutables = [:].withDefault { execName -> 16 | def executable = new File(javaExecutablesPath, execName) 17 | assert executable.exists(): "There is no ${execName} executable in ${javaExecutablesPath}" 18 | executable 19 | } 20 | 21 | tasks.withType(AbstractCompile) { 22 | options.with { 23 | fork = true 24 | forkOptions.javaHome = file(javaHome) 25 | } 26 | } 27 | 28 | tasks.withType(Javadoc) { 29 | executable = javaExecutables.javadoc 30 | } 31 | 32 | tasks.withType(Test) { 33 | executable = javaExecutables.java 34 | } 35 | 36 | tasks.withType(JavaExec) { 37 | executable = javaExecutables.java 38 | } 39 | 40 | repositories { 41 | jcenter() 42 | } 43 | 44 | dependencies { 45 | compile 'org.eclipse.jetty:jetty-server:9.4.31.v20200723' 46 | } 47 | 48 | application { 49 | mainClassName = "io.github.rodrigovedovato.letty.JettyServer" 50 | } 51 | 52 | compileJava.options.fork = true 53 | compileJava.options.forkOptions.executable = "/home/rodrigo/bin/jdk-16/bin/javac" -------------------------------------------------------------------------------- /gradle.properties: -------------------------------------------------------------------------------- 1 | javaHome = /home/rodrigo/bin/jdk-16/ 2 | targetJavaVersion = 16 -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | distributionBase=GRADLE_USER_HOME 2 | distributionPath=wrapper/dists 3 | distributionUrl=https\://services.gradle.org/distributions/gradle-6.5.1-bin.zip 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | # 4 | # Copyright 2015 the original author or authors. 5 | # 6 | # Licensed under the Apache License, Version 2.0 (the "License"); 7 | # you may not use this file except in compliance with the License. 8 | # You may obtain a copy of the License at 9 | # 10 | # https://www.apache.org/licenses/LICENSE-2.0 11 | # 12 | # Unless required by applicable law or agreed to in writing, software 13 | # distributed under the License is distributed on an "AS IS" BASIS, 14 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 | # See the License for the specific language governing permissions and 16 | # limitations under the License. 17 | # 18 | 19 | ############################################################################## 20 | ## 21 | ## Gradle start up script for UN*X 22 | ## 23 | ############################################################################## 24 | 25 | # Attempt to set APP_HOME 26 | # Resolve links: $0 may be a link 27 | PRG="$0" 28 | # Need this for relative symlinks. 29 | while [ -h "$PRG" ] ; do 30 | ls=`ls -ld "$PRG"` 31 | link=`expr "$ls" : '.*-> \(.*\)$'` 32 | if expr "$link" : '/.*' > /dev/null; then 33 | PRG="$link" 34 | else 35 | PRG=`dirname "$PRG"`"/$link" 36 | fi 37 | done 38 | SAVED="`pwd`" 39 | cd "`dirname \"$PRG\"`/" >/dev/null 40 | APP_HOME="`pwd -P`" 41 | cd "$SAVED" >/dev/null 42 | 43 | APP_NAME="Gradle" 44 | APP_BASE_NAME=`basename "$0"` 45 | 46 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 47 | DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' 48 | 49 | # Use the maximum available, or set MAX_FD != -1 to use that value. 50 | MAX_FD="maximum" 51 | 52 | warn () { 53 | echo "$*" 54 | } 55 | 56 | die () { 57 | echo 58 | echo "$*" 59 | echo 60 | exit 1 61 | } 62 | 63 | # OS specific support (must be 'true' or 'false'). 64 | cygwin=false 65 | msys=false 66 | darwin=false 67 | nonstop=false 68 | case "`uname`" in 69 | CYGWIN* ) 70 | cygwin=true 71 | ;; 72 | Darwin* ) 73 | darwin=true 74 | ;; 75 | MINGW* ) 76 | msys=true 77 | ;; 78 | NONSTOP* ) 79 | nonstop=true 80 | ;; 81 | esac 82 | 83 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 84 | 85 | 86 | # Determine the Java command to use to start the JVM. 87 | if [ -n "$JAVA_HOME" ] ; then 88 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 89 | # IBM's JDK on AIX uses strange locations for the executables 90 | JAVACMD="$JAVA_HOME/jre/sh/java" 91 | else 92 | JAVACMD="$JAVA_HOME/bin/java" 93 | fi 94 | if [ ! -x "$JAVACMD" ] ; then 95 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 96 | 97 | Please set the JAVA_HOME variable in your environment to match the 98 | location of your Java installation." 99 | fi 100 | else 101 | JAVACMD="java" 102 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 103 | 104 | Please set the JAVA_HOME variable in your environment to match the 105 | location of your Java installation." 106 | fi 107 | 108 | # Increase the maximum file descriptors if we can. 109 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 110 | MAX_FD_LIMIT=`ulimit -H -n` 111 | if [ $? -eq 0 ] ; then 112 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 113 | MAX_FD="$MAX_FD_LIMIT" 114 | fi 115 | ulimit -n $MAX_FD 116 | if [ $? -ne 0 ] ; then 117 | warn "Could not set maximum file descriptor limit: $MAX_FD" 118 | fi 119 | else 120 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 121 | fi 122 | fi 123 | 124 | # For Darwin, add options to specify how the application appears in the dock 125 | if $darwin; then 126 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 127 | fi 128 | 129 | # For Cygwin or MSYS, switch paths to Windows format before running java 130 | if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then 131 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 132 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 133 | 134 | JAVACMD=`cygpath --unix "$JAVACMD"` 135 | 136 | # We build the pattern for arguments to be converted via cygpath 137 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 138 | SEP="" 139 | for dir in $ROOTDIRSRAW ; do 140 | ROOTDIRS="$ROOTDIRS$SEP$dir" 141 | SEP="|" 142 | done 143 | OURCYGPATTERN="(^($ROOTDIRS))" 144 | # Add a user-defined pattern to the cygpath arguments 145 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 146 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 147 | fi 148 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 149 | i=0 150 | for arg in "$@" ; do 151 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 152 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 153 | 154 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 155 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 156 | else 157 | eval `echo args$i`="\"$arg\"" 158 | fi 159 | i=`expr $i + 1` 160 | done 161 | case $i in 162 | 0) set -- ;; 163 | 1) set -- "$args0" ;; 164 | 2) set -- "$args0" "$args1" ;; 165 | 3) set -- "$args0" "$args1" "$args2" ;; 166 | 4) set -- "$args0" "$args1" "$args2" "$args3" ;; 167 | 5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 168 | 6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 169 | 7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 170 | 8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 171 | 9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 172 | esac 173 | fi 174 | 175 | # Escape application args 176 | save () { 177 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 178 | echo " " 179 | } 180 | APP_ARGS=`save "$@"` 181 | 182 | # Collect all arguments for the java command, following the shell quoting and substitution rules 183 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 184 | 185 | exec "$JAVACMD" "$@" 186 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @rem 2 | @rem Copyright 2015 the original author or authors. 3 | @rem 4 | @rem Licensed under the Apache License, Version 2.0 (the "License"); 5 | @rem you may not use this file except in compliance with the License. 6 | @rem You may obtain a copy of the License at 7 | @rem 8 | @rem https://www.apache.org/licenses/LICENSE-2.0 9 | @rem 10 | @rem Unless required by applicable law or agreed to in writing, software 11 | @rem distributed under the License is distributed on an "AS IS" BASIS, 12 | @rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | @rem See the License for the specific language governing permissions and 14 | @rem limitations under the License. 15 | @rem 16 | 17 | @if "%DEBUG%" == "" @echo off 18 | @rem ########################################################################## 19 | @rem 20 | @rem Gradle startup script for Windows 21 | @rem 22 | @rem ########################################################################## 23 | 24 | @rem Set local scope for the variables with windows NT shell 25 | if "%OS%"=="Windows_NT" setlocal 26 | 27 | set DIRNAME=%~dp0 28 | if "%DIRNAME%" == "" set DIRNAME=. 29 | set APP_BASE_NAME=%~n0 30 | set APP_HOME=%DIRNAME% 31 | 32 | @rem Resolve any "." and ".." in APP_HOME to make it shorter. 33 | for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi 34 | 35 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 36 | set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" 37 | 38 | @rem Find java.exe 39 | if defined JAVA_HOME goto findJavaFromJavaHome 40 | 41 | set JAVA_EXE=java.exe 42 | %JAVA_EXE% -version >NUL 2>&1 43 | if "%ERRORLEVEL%" == "0" goto init 44 | 45 | echo. 46 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 47 | echo. 48 | echo Please set the JAVA_HOME variable in your environment to match the 49 | echo location of your Java installation. 50 | 51 | goto fail 52 | 53 | :findJavaFromJavaHome 54 | set JAVA_HOME=%JAVA_HOME:"=% 55 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 56 | 57 | if exist "%JAVA_EXE%" goto init 58 | 59 | echo. 60 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 61 | echo. 62 | echo Please set the JAVA_HOME variable in your environment to match the 63 | echo location of your Java installation. 64 | 65 | goto fail 66 | 67 | :init 68 | @rem Get command-line arguments, handling Windows variants 69 | 70 | if not "%OS%" == "Windows_NT" goto win9xME_args 71 | 72 | :win9xME_args 73 | @rem Slurp the command line arguments. 74 | set CMD_LINE_ARGS= 75 | set _SKIP=2 76 | 77 | :win9xME_args_slurp 78 | if "x%~1" == "x" goto execute 79 | 80 | set CMD_LINE_ARGS=%* 81 | 82 | :execute 83 | @rem Setup the command line 84 | 85 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 86 | 87 | 88 | @rem Execute Gradle 89 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 90 | 91 | :end 92 | @rem End local scope for the variables with windows NT shell 93 | if "%ERRORLEVEL%"=="0" goto mainEnd 94 | 95 | :fail 96 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 97 | rem the _cmd.exe /c_ return code! 98 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 99 | exit /b 1 100 | 101 | :mainEnd 102 | if "%OS%"=="Windows_NT" endlocal 103 | 104 | :omega 105 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | /* 2 | * This file was generated by the Gradle 'init' task. 3 | * 4 | * The settings file is used to specify which projects to include in your build. 5 | * 6 | * Detailed information about configuring a multi-project build in Gradle can be found 7 | * in the user manual at https://docs.gradle.org/5.6.3/userguide/multi_project_builds.html 8 | */ 9 | 10 | rootProject.name = 'letty' 11 | -------------------------------------------------------------------------------- /src/docker/Dockerfile: -------------------------------------------------------------------------------- 1 | FROM ubuntu:latest 2 | 3 | WORKDIR /opt/letty/ 4 | 5 | RUN apt update -y && apt install -y wget && \ 6 | wget -O "loom-jdk.tar.gz" "https://download.java.net/java/early_access/loom/6/openjdk-16-loom+6-105_linux-x64_bin.tar.gz" && \ 7 | tar -xzvf "loom-jdk.tar.gz" 8 | 9 | ENV PATH="/opt/letty/jdk-16/bin:${PATH}" 10 | 11 | COPY letty-all.jar letty.jar 12 | 13 | ENTRYPOINT [ "java", "-jar", "letty.jar" ] 14 | -------------------------------------------------------------------------------- /src/main/java/io/github/rodrigovedovato/letty/JettyServer.java: -------------------------------------------------------------------------------- 1 | package io.github.rodrigovedovato.letty; 2 | 3 | import io.github.rodrigovedovato.letty.handlers.HelloWorldHandler; 4 | import io.github.rodrigovedovato.letty.infrastructure.LoomThreadPool; 5 | import org.eclipse.jetty.server.Connector; 6 | import org.eclipse.jetty.server.Server; 7 | import org.eclipse.jetty.server.ServerConnector; 8 | 9 | public class JettyServer { 10 | public static Server createLoomBasedServer(int port) { 11 | var server = new Server(new LoomThreadPool()); 12 | 13 | ServerConnector connector = new ServerConnector(server); 14 | connector.setPort(port); 15 | 16 | server.setConnectors(new Connector[]{connector}); 17 | server.setHandler(new HelloWorldHandler()); 18 | 19 | return server; 20 | } 21 | 22 | public static Server createThreadPoolBasedServer(int port) { 23 | var server = new Server(port); 24 | server.setHandler(new HelloWorldHandler()); 25 | 26 | return server; 27 | } 28 | 29 | public static void main(String[] args) throws Exception { 30 | var port = 8080; 31 | Server server = null; 32 | var serverMode = System.getenv("SERVER_MODE"); 33 | 34 | if ("loom".equalsIgnoreCase(serverMode)) { 35 | server = createLoomBasedServer(port); 36 | } else if ("standard".equalsIgnoreCase(serverMode)) { 37 | server = createThreadPoolBasedServer(port); 38 | } else { 39 | throw new RuntimeException(); 40 | } 41 | 42 | server.start(); 43 | server.join(); 44 | } 45 | } 46 | -------------------------------------------------------------------------------- /src/main/java/io/github/rodrigovedovato/letty/handlers/HelloWorldHandler.java: -------------------------------------------------------------------------------- 1 | package io.github.rodrigovedovato.letty.handlers; 2 | 3 | import java.io.IOException; 4 | import java.io.PrintWriter; 5 | import java.util.Random; 6 | import javax.servlet.http.HttpServletRequest; 7 | import javax.servlet.http.HttpServletResponse; 8 | 9 | import org.eclipse.jetty.server.Request; 10 | import org.eclipse.jetty.server.handler.AbstractHandler; 11 | 12 | public class HelloWorldHandler extends AbstractHandler 13 | { 14 | final String greeting; 15 | final String body; 16 | 17 | private Random random = new Random(); 18 | 19 | public HelloWorldHandler() { 20 | this("Hello World"); 21 | } 22 | 23 | public HelloWorldHandler(String greeting) { 24 | this(greeting, null); 25 | } 26 | 27 | public HelloWorldHandler(String greeting, String body) { 28 | this.greeting = greeting; 29 | this.body = body; 30 | } 31 | 32 | @Override 33 | public void handle(String target, 34 | Request baseRequest, 35 | HttpServletRequest request, 36 | HttpServletResponse response) throws IOException { 37 | response.setContentType("text/html; charset=utf-8"); 38 | response.setStatus(HttpServletResponse.SC_OK); 39 | 40 | PrintWriter out = response.getWriter(); 41 | 42 | out.println("

" + greeting + "

"); 43 | 44 | if (body != null) { 45 | out.println(body); 46 | } 47 | 48 | int low = 500; 49 | int high = 1000; 50 | int result = random.nextInt(high-low) + low; 51 | 52 | try { 53 | Thread.sleep(Integer.toUnsignedLong(result)); 54 | baseRequest.setHandled(true); 55 | } catch (InterruptedException ex){ 56 | baseRequest.setHandled(false); 57 | } 58 | } 59 | } -------------------------------------------------------------------------------- /src/main/java/io/github/rodrigovedovato/letty/infrastructure/LoomThreadPool.java: -------------------------------------------------------------------------------- 1 | package io.github.rodrigovedovato.letty.infrastructure; 2 | 3 | import org.eclipse.jetty.util.thread.ThreadPool; 4 | 5 | import java.util.concurrent.ExecutorService; 6 | import java.util.concurrent.Executors; 7 | import java.util.concurrent.TimeUnit; 8 | 9 | public class LoomThreadPool implements ThreadPool { 10 | ExecutorService executorService = Executors.newVirtualThreadExecutor(); 11 | 12 | @Override 13 | public void join() throws InterruptedException { 14 | executorService.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS); 15 | } 16 | 17 | @Override 18 | public int getThreads() { 19 | return 1; 20 | } 21 | 22 | @Override 23 | public int getIdleThreads() { 24 | return 1; 25 | } 26 | 27 | @Override 28 | public boolean isLowOnThreads() { 29 | return false; 30 | } 31 | 32 | @Override 33 | public void execute(Runnable command) { 34 | executorService.submit(command); 35 | } 36 | } 37 | --------------------------------------------------------------------------------