├── .gitignore ├── .travis.yml ├── CHANGELOG.md ├── LICENSE.txt ├── README.md ├── build.gradle ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── settings.gradle └── src ├── main └── java │ └── de │ └── muspellheim │ └── eventbus │ ├── EventBus.java │ └── package-info.java └── test └── java └── de └── muspellheim └── eventbus ├── EventBusExample.java └── EventBusTest.java /.gitignore: -------------------------------------------------------------------------------- 1 | # Gradle 2 | build/ 3 | .gradle 4 | gradle.properties 5 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: java 2 | jdk: 3 | - oraclejdk8 4 | -------------------------------------------------------------------------------- /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | Changelog 2 | ========= 3 | 4 | All notable changes to this project will be documented in this file. 5 | 6 | The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) 7 | and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html). 8 | 9 | ## [Unreleased] 10 | 11 | ## [1.1.0] - 2017-08-03 12 | 13 | ### Added 14 | 15 | * Library is an OSGi bundle and Eclipse plug-in also. 16 | 17 | ## 1.0.0 - 2017-07-29 18 | 19 | ### Added 20 | 21 | * Event bus to subribe and publish events. 22 | 23 | 24 | [Unreleased]: https://github.com/falkoschumann/java-eventbus/compare/v1.1.0...HEAD 25 | [1.1.0]: https://github.com/falkoschumann/java-eventbus/compare/v1.0.0...v1.1.0 26 | -------------------------------------------------------------------------------- /LICENSE.txt: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2017 Falko Schumann 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | [![Build Status](https://travis-ci.org/falkoschumann/java-eventbus.svg?branch=master)](https://travis-ci.org/falkoschumann/java-eventbus) 2 | [![GitHub release](https://img.shields.io/github/release/falkoschumann/java-eventbus.svg)]() 3 | 4 | 5 | Eventbus 6 | ======== 7 | 8 | Subscribe and publish events. Events are published in channels distinguished by 9 | event type. Channels can be grouped using an event type hierarchy. 10 | 11 | You can use the default event bus instance, which is a singleton or you can 12 | create one or multiple instances. 13 | 14 | 15 | Installation 16 | ------------ 17 | 18 | ### Gradle 19 | 20 | Add the the repository _jcenter_ to your `build.gradle` 21 | 22 | repositories { 23 | jcenter() 24 | } 25 | 26 | and add the dependency 27 | 28 | compile 'de.muspellheim:eventbus:1.1.0' 29 | 30 | 31 | ### Maven 32 | 33 | Add the the repository _jcenter_ to your `pom.xml` 34 | 35 | 36 | 37 | 38 | false 39 | 40 | central 41 | bintray 42 | http://jcenter.bintray.com 43 | 44 | 45 | 46 | and add the dependency 47 | 48 | 49 | 50 | de.muspellheim 51 | eventbus 52 | 1.1.0 53 | 54 | 55 | 56 | 57 | ### Download 58 | 59 | You can download JARs with binary, source and JavaDoc from GitHub under 60 | https://github.com/falkoschumann/java-eventbus/releases. 61 | 62 | 63 | Usage 64 | ----- 65 | 66 | You can create an individual event bus by constructor or use the default event 67 | bus as singleton. 68 | 69 | EventBus bus = EventBus.getDefault(); 70 | 71 | Subscribe to an event by type. You can use every class as event type. 72 | Subscribing a super type works as subcribe to any sub type. 73 | 74 | bus.subscribe(String.class, s -> System.out.println("String: " + s)); 75 | bus.subscribe(Number.class, n -> System.out.println("Number: " + n)); 76 | 77 | Let's publish some events. 78 | 79 | bus.publish("Foo"); // String 80 | bus.publish(42); // int 81 | bus.publish(2.718); // double 82 | 83 | The example output: 84 | 85 | String: Foo 86 | Number: 42 87 | Number: 2.718 88 | 89 | 90 | Contributing 91 | ------------ 92 | 93 | ### Publish artifacts to Bintray 94 | 95 | 1. Create file `gradle.properties` and set properties `bintrayUser` and 96 | `bintrayApiKey`. 97 | 2. Run `./gradlew uploadArchives`. 98 | 3. Check uploaded files and publish. 99 | 100 | ### Publish distribution to GitHub 101 | 102 | 1. Run `./gradle distZip`. 103 | 2. Upload created ZIP to GitHub releases. 104 | -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | buildscript { 2 | repositories { 3 | mavenCentral() 4 | } 5 | dependencies { 6 | classpath 'biz.aQute.bnd:biz.aQute.bnd.gradle:3.4.0' 7 | } 8 | } 9 | 10 | apply plugin: 'findbugs' 11 | apply plugin: 'java' 12 | apply plugin: 'maven' 13 | apply plugin: 'biz.aQute.bnd.builder' 14 | 15 | group = 'de.muspellheim' 16 | version = '1.1.0' 17 | 18 | sourceCompatibility = 1.8 19 | compileJava.options.encoding = 'UTF-8' 20 | 21 | repositories { 22 | jcenter() 23 | } 24 | 25 | dependencies { 26 | testImplementation 'junit:junit:4.12' 27 | } 28 | 29 | jar { 30 | manifest { 31 | attributes('Bundle-Name': project.name[0].toUpperCase() + project.name.substring(1)) 32 | attributes('Bundle-SymbolicName': project.group + '.' + project.name) 33 | attributes('Export-Package': project.group + '.' + project.name + '.*', '-sources': 'true',) 34 | } 35 | } 36 | 37 | task sourcesJar(type: Jar, dependsOn: classes) { 38 | classifier = 'sources' 39 | from sourceSets.main.allSource 40 | } 41 | 42 | task javadocJar(type: Jar, dependsOn: javadoc) { 43 | classifier = 'javadoc' 44 | from javadoc.destinationDir 45 | } 46 | 47 | artifacts { 48 | archives sourcesJar 49 | archives javadocJar 50 | } 51 | 52 | def bintrayUser = project.hasProperty('bintrayUser') ? project.property('bintrayUser') : System.getenv('BINTRAY_USER') 53 | def bintrayApiKey = project.hasProperty('bintrayApiKey') ? project.property('bintrayApiKey') : System.getenv('BINTRAY_API_KEY') 54 | uploadArchives { 55 | repositories { 56 | mavenDeployer { 57 | repository(url: "https://api.bintray.com/maven/falkoschumann/maven/${project.name}/;publish=0") { 58 | authentication(userName: bintrayUser, password: bintrayApiKey) 59 | } 60 | } 61 | } 62 | } 63 | 64 | task distZip(type: Zip) { 65 | from 'src/dist' 66 | from jar.outputs.files 67 | from sourcesJar.outputs.files 68 | from javadocJar.outputs.files 69 | from(projectDir) { 70 | include('README.md', 'CHANGELOG.md', 'LICENSE.txt') 71 | rename { fileName -> fileName.replace('.md', '.txt') } 72 | } 73 | } 74 | 75 | tasks.withType(FindBugs) { 76 | reports { 77 | xml.enabled false 78 | html.enabled true 79 | } 80 | } 81 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/falkoschumann/java-eventbus/d64cce8c1ce0149d86328d715a87a419714081a0/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Tue May 09 18:23:54 CEST 2017 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-3.5-all.zip 7 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Attempt to set APP_HOME 10 | # Resolve links: $0 may be a link 11 | PRG="$0" 12 | # Need this for relative symlinks. 13 | while [ -h "$PRG" ] ; do 14 | ls=`ls -ld "$PRG"` 15 | link=`expr "$ls" : '.*-> \(.*\)$'` 16 | if expr "$link" : '/.*' > /dev/null; then 17 | PRG="$link" 18 | else 19 | PRG=`dirname "$PRG"`"/$link" 20 | fi 21 | done 22 | SAVED="`pwd`" 23 | cd "`dirname \"$PRG\"`/" >/dev/null 24 | APP_HOME="`pwd -P`" 25 | cd "$SAVED" >/dev/null 26 | 27 | APP_NAME="Gradle" 28 | APP_BASE_NAME=`basename "$0"` 29 | 30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 31 | DEFAULT_JVM_OPTS="" 32 | 33 | # Use the maximum available, or set MAX_FD != -1 to use that value. 34 | MAX_FD="maximum" 35 | 36 | warn ( ) { 37 | echo "$*" 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 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | rootProject.name = 'eventbus' 2 | -------------------------------------------------------------------------------- /src/main/java/de/muspellheim/eventbus/EventBus.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright (c) 2017 Falko Schumann 3 | * Released under the terms of the MIT License. 4 | */ 5 | 6 | package de.muspellheim.eventbus; 7 | 8 | import java.util.*; 9 | import java.util.concurrent.*; 10 | import java.util.function.*; 11 | 12 | /** 13 | * Simple event bus implementation. 14 | *

15 | * Subscribe and publish events. Events are published in channels distinguished by event type. Channels can be grouped 16 | * using an event type hierarchy. 17 | *

18 | * You can use the default event bus instance {@link #getDefault}, which is a singleton or you can create one or multiple 19 | * instances of {@link EventBus}. 20 | */ 21 | public class EventBus { 22 | 23 | private static EventBus INSTANCE = new EventBus(); 24 | 25 | private final Map, Set> subscribers = new ConcurrentHashMap<>(); 26 | 27 | /** 28 | * Get the default event bus, can be used as application wide singleton. 29 | * 30 | * @return the only instance of the default event bus. 31 | */ 32 | public static EventBus getDefault() { 33 | return INSTANCE; 34 | } 35 | 36 | /** 37 | * Subscribe to an event type 38 | * 39 | * @param eventType the event type, can be a super class of all events to subscribe. 40 | * @param subscriber the subscriber which will consume the events. 41 | * @param the event type class. 42 | */ 43 | public void subscribe(Class eventType, Consumer subscriber) { 44 | Objects.requireNonNull(eventType, "eventType"); 45 | Objects.requireNonNull(subscriber, "subscriber"); 46 | 47 | Set eventSubscribers = getOrCreateSubscribers(eventType); 48 | eventSubscribers.add(subscriber); 49 | } 50 | 51 | private Set getOrCreateSubscribers(Class eventType) { 52 | Set eventSubscribers = subscribers.get(eventType); 53 | if (eventSubscribers == null) { 54 | eventSubscribers = new CopyOnWriteArraySet<>(); 55 | subscribers.put(eventType, eventSubscribers); 56 | } 57 | return eventSubscribers; 58 | } 59 | 60 | /** 61 | * Unsubscribe from all event types. 62 | * 63 | * @param subscriber the subscriber to unsubscribe. 64 | */ 65 | public void unsubscribe(Consumer subscriber) { 66 | Objects.requireNonNull(subscriber, "subscriber"); 67 | 68 | subscribers.values().forEach(eventSubscribers -> eventSubscribers.remove(subscriber)); 69 | } 70 | 71 | /** 72 | * Unsubscribe from an event type. 73 | * 74 | * @param eventType the event type, can be a super class of all events to unsubscribe. 75 | * @param subscriber the subscriber to unsubscribe. 76 | * @param the event type class. 77 | */ 78 | public void unsubscribe(Class eventType, Consumer subscriber) { 79 | Objects.requireNonNull(eventType, "eventType"); 80 | Objects.requireNonNull(subscriber, "subscriber"); 81 | 82 | subscribers.keySet().stream() 83 | .filter(type -> eventType.isAssignableFrom(type)) 84 | .map(type -> subscribers.get(type)) 85 | .forEach(eventSubscribers -> eventSubscribers.remove(subscriber)); 86 | } 87 | 88 | /** 89 | * Publish an event to all subscribers. 90 | *

91 | * The event type is the class of event. The event is published to all consumers which subscribed to 92 | * this event type or any super class. 93 | * 94 | * @param event the event. 95 | */ 96 | public void publish(Object event) { 97 | Objects.requireNonNull(event, "event"); 98 | 99 | Class eventType = event.getClass(); 100 | subscribers.keySet().stream() 101 | .filter(type -> type.isAssignableFrom(eventType)) 102 | .flatMap(type -> subscribers.get(type).stream()) 103 | .forEach(subscriber -> publish(event, subscriber)); 104 | } 105 | 106 | private static void publish(Object event, Consumer subscriber) { 107 | try { 108 | subscriber.accept(event); 109 | } catch (Exception e) { 110 | Thread.currentThread().getUncaughtExceptionHandler().uncaughtException(Thread.currentThread(), e); 111 | } 112 | } 113 | 114 | } 115 | -------------------------------------------------------------------------------- /src/main/java/de/muspellheim/eventbus/package-info.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright (c) 2017 Falko Schumann 3 | * Released under the terms of the MIT License. 4 | */ 5 | 6 | /** 7 | * Use Eventbus to subscribe and publish application wide events. 8 | */ 9 | package de.muspellheim.eventbus; 10 | -------------------------------------------------------------------------------- /src/test/java/de/muspellheim/eventbus/EventBusExample.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright (c) 2017 Falko Schumann 3 | * Released under the terms of the MIT License. 4 | */ 5 | 6 | package de.muspellheim.eventbus; 7 | 8 | public class EventBusExample { 9 | 10 | public void usage() { 11 | EventBus bus = EventBus.getDefault(); 12 | 13 | bus.subscribe(String.class, s -> System.out.println("String: " + s)); 14 | bus.subscribe(Number.class, n -> System.out.println("Number: " + n)); 15 | 16 | bus.publish("Foo"); 17 | bus.publish(42); 18 | bus.publish(2.718); 19 | } 20 | 21 | } 22 | -------------------------------------------------------------------------------- /src/test/java/de/muspellheim/eventbus/EventBusTest.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright (c) 2017 Falko Schumann 3 | * Released under the terms of the MIT License. 4 | */ 5 | 6 | package de.muspellheim.eventbus; 7 | 8 | import org.junit.*; 9 | 10 | import java.util.*; 11 | import java.util.function.*; 12 | 13 | import static org.junit.Assert.*; 14 | 15 | /** 16 | * Unit tests, integration tests, acceptance tests and examples. 17 | *

18 | * Not enough stuff to separate it. 19 | */ 20 | public class EventBusTest { 21 | 22 | private List stringEvents = new ArrayList<>(); 23 | private List integerEvents = new ArrayList<>(); 24 | private List numberEvents = new ArrayList<>(); 25 | private List doubleEvents = new ArrayList<>(); 26 | 27 | private void consumeString(String event) { 28 | stringEvents.add(event); 29 | } 30 | 31 | private void consumeInt(int event) { 32 | integerEvents.add(event); 33 | } 34 | 35 | private void consumeNumber(Number event) { 36 | numberEvents.add(event); 37 | } 38 | 39 | private void consumeDouble(Number event) { 40 | doubleEvents.add(event); 41 | } 42 | 43 | @Test(expected = NullPointerException.class) 44 | public void subscribe_EventTypeNull() { 45 | EventBus bus = EventBus.getDefault(); 46 | bus.subscribe(null, this::consumeString); 47 | } 48 | 49 | @Test(expected = NullPointerException.class) 50 | public void subscribe_SubscriberNull() { 51 | EventBus bus = EventBus.getDefault(); 52 | bus.subscribe(String.class, null); 53 | } 54 | 55 | @Test(expected = NullPointerException.class) 56 | public void unsubscribe_EventTypeNull() { 57 | EventBus bus = EventBus.getDefault(); 58 | bus.unsubscribe(null, this::consumeString); 59 | } 60 | 61 | @Test(expected = NullPointerException.class) 62 | public void unsubscribe_SubscriberNull() { 63 | EventBus bus = EventBus.getDefault(); 64 | bus.unsubscribe(null); 65 | } 66 | 67 | @Test(expected = NullPointerException.class) 68 | public void publish_EventNull() { 69 | EventBus bus = EventBus.getDefault(); 70 | 71 | bus.publish(null); 72 | } 73 | 74 | @Test 75 | public void publish() { 76 | EventBus bus = EventBus.getDefault(); 77 | bus.subscribe(String.class, this::consumeString); 78 | bus.subscribe(Integer.class, this::consumeInt); 79 | 80 | bus.publish("Foo"); 81 | bus.publish(42); 82 | bus.publish("Bar"); 83 | 84 | assertEquals("string events", Arrays.asList("Foo", "Bar"), stringEvents); 85 | assertEquals("integer events", Arrays.asList(42), integerEvents); 86 | } 87 | 88 | @Test 89 | public void unsubscribe() { 90 | EventBus bus = EventBus.getDefault(); 91 | Consumer subscriber = this::consumeString; 92 | bus.subscribe(String.class, subscriber); 93 | 94 | bus.publish("Foo"); 95 | bus.unsubscribe(subscriber); 96 | bus.publish("Bar"); 97 | 98 | assertEquals(Arrays.asList("Foo"), stringEvents); 99 | } 100 | 101 | @Test 102 | public void eventTypeHierarchy() { 103 | EventBus bus = EventBus.getDefault(); 104 | Consumer intSubscriber = this::consumeInt; 105 | bus.subscribe(Integer.class, intSubscriber); 106 | Consumer numberSubscriber = this::consumeNumber; 107 | bus.subscribe(Number.class, numberSubscriber); 108 | Consumer doubleSubscriber = this::consumeDouble; 109 | bus.subscribe(Double.class, doubleSubscriber); 110 | 111 | bus.publish(0.815); 112 | bus.publish(42); 113 | bus.unsubscribe(Number.class, numberSubscriber); 114 | bus.unsubscribe(Number.class, doubleSubscriber); 115 | bus.publish(2.718); 116 | bus.unsubscribe(Integer.class, intSubscriber); 117 | bus.publish(7); 118 | 119 | assertEquals("integer events", Arrays.asList(42), integerEvents); 120 | assertEquals("number events", Arrays.asList(0.815, 42), numberEvents); 121 | assertEquals("double events", Arrays.asList(0.815), doubleEvents); 122 | } 123 | 124 | } 125 | --------------------------------------------------------------------------------