├── .github └── workflows │ └── gradle-publish.yml ├── .gitignore ├── LICENSE ├── README.md ├── build.gradle ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── settings.gradle └── src ├── main └── java │ └── net │ └── staro │ └── event │ └── bus │ └── api │ ├── CancellableEvent.java │ ├── EventBus.java │ ├── EventListener.java │ ├── Listener.java │ └── Priority.java └── test └── java └── boe └── jiden └── test ├── Main.java ├── dummies ├── DummyEventBus.java ├── DummyGenericListener.java ├── DummyListener.java ├── event │ └── TestDummyEvent.java └── listener │ └── TestDummyListener.java └── event └── TestEvent.java /.github/workflows/gradle-publish.yml: -------------------------------------------------------------------------------- 1 | # This workflow uses actions that are not certified by GitHub. 2 | # They are provided by a third-party and are governed by 3 | # separate terms of service, privacy policy, and support 4 | # documentation. 5 | # This workflow will build a package using Gradle and then publish it to GitHub packages when a release is created 6 | # For more information see: https://github.com/actions/setup-java/blob/main/docs/advanced-usage.md#Publishing-using-gradle 7 | 8 | name: Gradle Package 9 | 10 | on: 11 | release: 12 | types: [created] 13 | 14 | jobs: 15 | build: 16 | 17 | runs-on: ubuntu-latest 18 | permissions: 19 | contents: read 20 | packages: write 21 | 22 | steps: 23 | - uses: actions/checkout@v4 24 | - name: Set up JDK 17 25 | uses: actions/setup-java@v4 26 | with: 27 | java-version: '17' 28 | distribution: 'temurin' 29 | server-id: github # Value of the distributionManagement/repository/id field of the pom.xml 30 | settings-path: ${{ github.workspace }} # location for the settings.xml file 31 | 32 | - name: Setup Gradle 33 | uses: gradle/actions/setup-gradle@417ae3ccd767c252f5661f1ace9f835f9654f2b5 # v3.1.0 34 | 35 | - name: Build with Gradle 36 | run: ./gradlew build 37 | 38 | # The USERNAME and TOKEN need to correspond to the credentials environment variables used in 39 | # the publishing section of your build.gradle 40 | - name: Publish to GitHub Packages 41 | run: ./gradlew publish 42 | env: 43 | USERNAME: ${{ github.actor }} 44 | TOKEN: ${{ secrets.GITHUB_TOKEN }} 45 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | .gradle 2 | build/ 3 | gradle/wrapper/gradle-wrapper.jar 4 | !**/src/main/**/build/ 5 | !**/src/test/**/build/ 6 | 7 | ### IntelliJ IDEA ### 8 | .idea/ 9 | *.iws 10 | *.iml 11 | *.ipr 12 | out/ 13 | !**/src/main/**/out/ 14 | !**/src/test/**/out/ 15 | 16 | ### Eclipse ### 17 | .apt_generated 18 | .classpath 19 | .factorypath 20 | .project 21 | .settings 22 | .springBeans 23 | .sts4-cache 24 | bin/ 25 | !**/src/main/**/bin/ 26 | !**/src/test/**/bin/ 27 | 28 | ### NetBeans ### 29 | /nbproject/private/ 30 | /nbbuild/ 31 | /dist/ 32 | /nbdist/ 33 | /.nb-gradle/ 34 | 35 | ### VS Code ### 36 | .vscode/ 37 | 38 | ### Mac OS ### 39 | .DS_Store -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2024 selfpop 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 | # Bad 2 | Visit https://github.com/starobot/rokit 3 | -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | plugins { 2 | id 'java' 3 | id 'maven-publish' 4 | } 5 | 6 | group = 'net.staro.event.bus.api' 7 | version = '3.0' 8 | 9 | repositories { 10 | mavenCentral() 11 | maven { url "https://jitpack.io" } 12 | } 13 | 14 | dependencies { 15 | testImplementation platform('org.junit:junit-bom:5.10.0') 16 | testImplementation 'org.junit.jupiter:junit-jupiter' 17 | implementation 'com.github.jitpack:gradle-simple:1.0' 18 | } 19 | 20 | java { 21 | sourceCompatibility = JavaVersion.VERSION_17 22 | targetCompatibility = JavaVersion.VERSION_17 23 | withSourcesJar() 24 | withJavadocJar() 25 | } 26 | 27 | tasks.withType(JavaCompile).configureEach { 28 | if (JavaVersion.current().isJava9Compatible()) { 29 | it.options.release.set(17) 30 | } 31 | } 32 | 33 | test { 34 | useJUnitPlatform() 35 | } 36 | 37 | publishing { 38 | publications { 39 | maven(MavenPublication) { 40 | from components.java 41 | } 42 | } 43 | } -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/starobot/StaroEventSystem/9bbbebb36ed9e6447c6224266b999b3e6d0c0dfc/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | distributionBase=GRADLE_USER_HOME 2 | distributionPath=wrapper/dists 3 | distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip 4 | networkTimeout=10000 5 | validateDistributionUrl=true 6 | zipStoreBase=GRADLE_USER_HOME 7 | zipStorePath=wrapper/dists 8 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | 3 | # 4 | # Copyright © 2015-2021 the original 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 POSIX generated by Gradle. 22 | # 23 | # Important for running: 24 | # 25 | # (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is 26 | # noncompliant, but you have some other compliant shell such as ksh or 27 | # bash, then to run this script, type that shell name before the whole 28 | # command line, like: 29 | # 30 | # ksh Gradle 31 | # 32 | # Busybox and similar reduced shells will NOT work, because this script 33 | # requires all of these POSIX shell features: 34 | # * functions; 35 | # * expansions «$var», «${var}», «${var:-default}», «${var+SET}», 36 | # «${var#prefix}», «${var%suffix}», and «$( cmd )»; 37 | # * compound commands having a testable exit status, especially «case»; 38 | # * various built-in commands including «command», «set», and «ulimit». 39 | # 40 | # Important for patching: 41 | # 42 | # (2) This script targets any POSIX shell, so it avoids extensions provided 43 | # by Bash, Ksh, etc; in particular arrays are avoided. 44 | # 45 | # The "traditional" practice of packing multiple parameters into a 46 | # space-separated string is a well documented source of bugs and security 47 | # problems, so this is (mostly) avoided, by progressively accumulating 48 | # options in "$@", and eventually passing that to Java. 49 | # 50 | # Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS, 51 | # and GRADLE_OPTS) rely on word-splitting, this is performed explicitly; 52 | # see the in-line comments for details. 53 | # 54 | # There are tweaks for specific operating systems such as AIX, CygWin, 55 | # Darwin, MinGW, and NonStop. 56 | # 57 | # (3) This script is generated from the Groovy template 58 | # https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt 59 | # within the Gradle project. 60 | # 61 | # You can find Gradle at https://github.com/gradle/gradle/. 62 | # 63 | ############################################################################## 64 | 65 | # Attempt to set APP_HOME 66 | 67 | # Resolve links: $0 may be a link 68 | app_path=$0 69 | 70 | # Need this for daisy-chained symlinks. 71 | while 72 | APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path 73 | [ -h "$app_path" ] 74 | do 75 | ls=$( ls -ld "$app_path" ) 76 | link=${ls#*' -> '} 77 | case $link in #( 78 | /*) app_path=$link ;; #( 79 | *) app_path=$APP_HOME$link ;; 80 | esac 81 | done 82 | 83 | # This is normally unused 84 | # shellcheck disable=SC2034 85 | APP_BASE_NAME=${0##*/} 86 | # Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036) 87 | APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit 88 | 89 | # Use the maximum available, or set MAX_FD != -1 to use that value. 90 | MAX_FD=maximum 91 | 92 | warn () { 93 | echo "$*" 94 | } >&2 95 | 96 | die () { 97 | echo 98 | echo "$*" 99 | echo 100 | exit 1 101 | } >&2 102 | 103 | # OS specific support (must be 'true' or 'false'). 104 | cygwin=false 105 | msys=false 106 | darwin=false 107 | nonstop=false 108 | case "$( uname )" in #( 109 | CYGWIN* ) cygwin=true ;; #( 110 | Darwin* ) darwin=true ;; #( 111 | MSYS* | MINGW* ) msys=true ;; #( 112 | NONSTOP* ) nonstop=true ;; 113 | esac 114 | 115 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 116 | 117 | 118 | # Determine the Java command to use to start the JVM. 119 | if [ -n "$JAVA_HOME" ] ; then 120 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 121 | # IBM's JDK on AIX uses strange locations for the executables 122 | JAVACMD=$JAVA_HOME/jre/sh/java 123 | else 124 | JAVACMD=$JAVA_HOME/bin/java 125 | fi 126 | if [ ! -x "$JAVACMD" ] ; then 127 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 128 | 129 | Please set the JAVA_HOME variable in your environment to match the 130 | location of your Java installation." 131 | fi 132 | else 133 | JAVACMD=java 134 | if ! command -v java >/dev/null 2>&1 135 | then 136 | die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 137 | 138 | Please set the JAVA_HOME variable in your environment to match the 139 | location of your Java installation." 140 | fi 141 | fi 142 | 143 | # Increase the maximum file descriptors if we can. 144 | if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then 145 | case $MAX_FD in #( 146 | max*) 147 | # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked. 148 | # shellcheck disable=SC2039,SC3045 149 | MAX_FD=$( ulimit -H -n ) || 150 | warn "Could not query maximum file descriptor limit" 151 | esac 152 | case $MAX_FD in #( 153 | '' | soft) :;; #( 154 | *) 155 | # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked. 156 | # shellcheck disable=SC2039,SC3045 157 | ulimit -n "$MAX_FD" || 158 | warn "Could not set maximum file descriptor limit to $MAX_FD" 159 | esac 160 | fi 161 | 162 | # Collect all arguments for the java command, stacking in reverse order: 163 | # * args from the command line 164 | # * the main class name 165 | # * -classpath 166 | # * -D...appname settings 167 | # * --module-path (only if needed) 168 | # * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables. 169 | 170 | # For Cygwin or MSYS, switch paths to Windows format before running java 171 | if "$cygwin" || "$msys" ; then 172 | APP_HOME=$( cygpath --path --mixed "$APP_HOME" ) 173 | CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" ) 174 | 175 | JAVACMD=$( cygpath --unix "$JAVACMD" ) 176 | 177 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 178 | for arg do 179 | if 180 | case $arg in #( 181 | -*) false ;; # don't mess with options #( 182 | /?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath 183 | [ -e "$t" ] ;; #( 184 | *) false ;; 185 | esac 186 | then 187 | arg=$( cygpath --path --ignore --mixed "$arg" ) 188 | fi 189 | # Roll the args list around exactly as many times as the number of 190 | # args, so each arg winds up back in the position where it started, but 191 | # possibly modified. 192 | # 193 | # NB: a `for` loop captures its iteration list before it begins, so 194 | # changing the positional parameters here affects neither the number of 195 | # iterations, nor the values presented in `arg`. 196 | shift # remove old arg 197 | set -- "$@" "$arg" # push replacement arg 198 | done 199 | fi 200 | 201 | 202 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 203 | DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' 204 | 205 | # Collect all arguments for the java command: 206 | # * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments, 207 | # and any embedded shellness will be escaped. 208 | # * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be 209 | # treated as '${Hostname}' itself on the command line. 210 | 211 | set -- \ 212 | "-Dorg.gradle.appname=$APP_BASE_NAME" \ 213 | -classpath "$CLASSPATH" \ 214 | org.gradle.wrapper.GradleWrapperMain \ 215 | "$@" 216 | 217 | # Stop when "xargs" is not available. 218 | if ! command -v xargs >/dev/null 2>&1 219 | then 220 | die "xargs is not available" 221 | fi 222 | 223 | # Use "xargs" to parse quoted args. 224 | # 225 | # With -n1 it outputs one arg per line, with the quotes and backslashes removed. 226 | # 227 | # In Bash we could simply go: 228 | # 229 | # readarray ARGS < <( xargs -n1 <<<"$var" ) && 230 | # set -- "${ARGS[@]}" "$@" 231 | # 232 | # but POSIX shell has neither arrays nor command substitution, so instead we 233 | # post-process each arg (as a line of input to sed) to backslash-escape any 234 | # character that might be a shell metacharacter, then use eval to reverse 235 | # that process (while maintaining the separation between arguments), and wrap 236 | # the whole thing up as a single "set" statement. 237 | # 238 | # This will of course break if any of these variables contains a newline or 239 | # an unmatched quote. 240 | # 241 | 242 | eval "set -- $( 243 | printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" | 244 | xargs -n1 | 245 | sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' | 246 | tr '\n' ' ' 247 | )" '"$@"' 248 | 249 | exec "$JAVACMD" "$@" 250 | -------------------------------------------------------------------------------- /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 | @rem This is normally unused 30 | set APP_BASE_NAME=%~n0 31 | set APP_HOME=%DIRNAME% 32 | 33 | @rem Resolve any "." and ".." in APP_HOME to make it shorter. 34 | for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi 35 | 36 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 37 | set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" 38 | 39 | @rem Find java.exe 40 | if defined JAVA_HOME goto findJavaFromJavaHome 41 | 42 | set JAVA_EXE=java.exe 43 | %JAVA_EXE% -version >NUL 2>&1 44 | if %ERRORLEVEL% equ 0 goto execute 45 | 46 | echo. 47 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 48 | echo. 49 | echo Please set the JAVA_HOME variable in your environment to match the 50 | echo location of your Java installation. 51 | 52 | goto fail 53 | 54 | :findJavaFromJavaHome 55 | set JAVA_HOME=%JAVA_HOME:"=% 56 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 57 | 58 | if exist "%JAVA_EXE%" goto execute 59 | 60 | echo. 61 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 62 | echo. 63 | echo Please set the JAVA_HOME variable in your environment to match the 64 | echo location of your Java installation. 65 | 66 | goto fail 67 | 68 | :execute 69 | @rem Setup the command line 70 | 71 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 72 | 73 | 74 | @rem Execute Gradle 75 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %* 76 | 77 | :end 78 | @rem End local scope for the variables with windows NT shell 79 | if %ERRORLEVEL% equ 0 goto mainEnd 80 | 81 | :fail 82 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 83 | rem the _cmd.exe /c_ return code! 84 | set EXIT_CODE=%ERRORLEVEL% 85 | if %EXIT_CODE% equ 0 set EXIT_CODE=1 86 | if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE% 87 | exit /b %EXIT_CODE% 88 | 89 | :mainEnd 90 | if "%OS%"=="Windows_NT" endlocal 91 | 92 | :omega 93 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | rootProject.name = 'starobus' 2 | 3 | -------------------------------------------------------------------------------- /src/main/java/net/staro/event/bus/api/CancellableEvent.java: -------------------------------------------------------------------------------- 1 | package net.staro.event.bus.api; 2 | 3 | /** 4 | * An event that can be canceled by listeners. 5 | */ 6 | public class CancellableEvent 7 | { 8 | private boolean cancelled; 9 | 10 | public CancellableEvent() { 11 | cancelled = false; 12 | } 13 | 14 | public boolean isCancelled() 15 | { 16 | return cancelled; 17 | } 18 | 19 | public void setCancelled(boolean cancelled) 20 | { 21 | this.cancelled = cancelled; 22 | } 23 | 24 | } 25 | -------------------------------------------------------------------------------- /src/main/java/net/staro/event/bus/api/EventBus.java: -------------------------------------------------------------------------------- 1 | package net.staro.event.bus.api; 2 | 3 | import java.lang.annotation.Annotation; 4 | import java.lang.reflect.Method; 5 | import java.util.*; 6 | import java.util.concurrent.CopyOnWriteArrayList; 7 | import java.util.function.BiFunction; 8 | 9 | /** 10 | * The event bus for registering and distributing events. 11 | * @see EventListener 12 | */ 13 | public class EventBus 14 | { 15 | /** 16 | * A hashmap is used for fast event lookup. Listeners are put into a list based on their event class. 17 | */ 18 | private final Map, List> listeners = new HashMap<>(); 19 | /** 20 | * Weak references subscribed objects to the event types they are listening to. 21 | * This allows an automatic unsubscription when the object is garbage collected. 22 | */ 23 | private final Map>> subscriptions = new HashMap<>(); 24 | /** 25 | * Stores factory functions for creating listeners based on their annotations. 26 | */ 27 | private final Map, BiFunction> listenerFactories = new HashMap<>(); 28 | 29 | public EventBus() 30 | { 31 | registerListenerFactory(Listener.class, (instance, method) -> new EventListener(instance, method, method.getAnnotation(Listener.class).priority().getVal())); 32 | } 33 | 34 | /** 35 | * Registers a factory function for creating a specific type of listener based on its annotation. 36 | * 37 | * @param annotationType The annotation class associated with the listener type. 38 | * @param factory The function that creates the listener instance given the object and method. 39 | */ 40 | public void registerListenerFactory(Class annotationType, BiFunction factory) 41 | { 42 | listenerFactories.put(annotationType, factory); 43 | } 44 | 45 | /** 46 | * Posts (dispatches) an event to all registered listeners. 47 | * 48 | * @param event The event object. 49 | */ 50 | public void post(Object event) 51 | { 52 | List listeners = this.listeners.get(event.getClass()); 53 | if (listeners == null) 54 | { 55 | return; 56 | } 57 | 58 | for (EventListener l : listeners) 59 | { 60 | if (l.getInstance() == null) 61 | { 62 | return; 63 | } 64 | 65 | Class eventParamType = l.getMethod().getParameterTypes()[0]; 66 | if (eventParamType.isAssignableFrom(event.getClass())) 67 | { 68 | l.invoke(event); 69 | } 70 | } 71 | } 72 | 73 | /** 74 | * Registers a listener instance to the event bus. 75 | * 76 | * @param instance is the listener to subscribe (register). 77 | */ 78 | public void subscribe(Object instance) 79 | { 80 | addListeners(getListeningMethods(instance.getClass()), instance); 81 | } 82 | 83 | /** 84 | * Unregisters a listener instance from the event bus, so the events are not being dispatched to it. 85 | * 86 | * @param instance is the listener to unsubscribe (unregister). 87 | */ 88 | public void unsubscribe(Object instance) 89 | { 90 | removeListeners(getListeningMethods(instance.getClass()), instance); 91 | subscriptions.remove(instance); 92 | } 93 | 94 | /** 95 | * Checks if a listener instance is subscribed (registered) to the event bus. 96 | * 97 | * @param instance The instance to check. 98 | * @return True if the instance is subscribed, false otherwise. 99 | */ 100 | public boolean isSubscribed(Object instance) 101 | { 102 | return subscriptions.containsKey(instance); 103 | } 104 | 105 | /** 106 | * Turns methods we know are listeners into listener objects. 107 | * 108 | * @param methods the methods we want to turn into listeners. 109 | * @param instance the method's class' instance (null if methods are static). 110 | */ 111 | private void addListeners(List methods, Object instance) 112 | { 113 | List> subscribedEvents = subscriptions.computeIfAbsent(instance, k -> new ArrayList<>()); 114 | for (Method method : methods) 115 | { 116 | Class eventType = getEventParameterType(method); 117 | listeners.putIfAbsent(eventType, new CopyOnWriteArrayList<>()); 118 | List list = listeners.get(eventType); 119 | for (Annotation annotation : method.getAnnotations()) 120 | { 121 | if (listenerFactories.containsKey(annotation.annotationType())) 122 | { 123 | BiFunction factory = listenerFactories.get(annotation.annotationType()); 124 | EventListener listener = factory.apply(instance, method); 125 | list.add(listener); 126 | list.sort(Comparator.comparingInt(EventListener::getPriority).reversed()); 127 | subscribedEvents.add(eventType); 128 | break; 129 | } 130 | } 131 | } 132 | } 133 | 134 | /** 135 | * Removes Listeners by looping over their respective lists. 136 | * 137 | * @param methods the methods we want to remove. 138 | * @param instance method's class' instance (null if methods are static). 139 | */ 140 | private void removeListeners(List methods, Object instance) 141 | { 142 | for (Method method : methods) 143 | { 144 | Class eventType = getEventParameterType(method); 145 | List list = listeners.get(eventType); 146 | if (list == null) 147 | { 148 | continue; 149 | } 150 | 151 | list.removeIf(l -> l.getMethod().equals(method) && l.getInstance() == instance); 152 | } 153 | } 154 | 155 | private List getListeningMethods(Class clazz) 156 | { 157 | ArrayList listening = new ArrayList<>(); 158 | for (Method method : clazz.getDeclaredMethods()) 159 | { 160 | for (Annotation annotation : method.getDeclaredAnnotations()) 161 | { 162 | if (listenerFactories.containsKey(annotation.annotationType()) && method.getParameterCount() == 1) 163 | { 164 | listening.add(method); 165 | } 166 | } 167 | } 168 | 169 | return listening; 170 | } 171 | 172 | private static Class getEventParameterType(Method method) 173 | { 174 | if (method.getParameterCount() != 1) 175 | { 176 | return null; 177 | } 178 | 179 | return method.getParameters()[0].getType(); 180 | } 181 | 182 | } 183 | -------------------------------------------------------------------------------- /src/main/java/net/staro/event/bus/api/EventListener.java: -------------------------------------------------------------------------------- 1 | package net.staro.event.bus.api; 2 | 3 | import java.lang.invoke.LambdaMetafactory; 4 | import java.lang.invoke.MethodHandle; 5 | import java.lang.invoke.MethodHandles; 6 | import java.lang.invoke.MethodType; 7 | import java.lang.reflect.Method; 8 | import java.util.function.Consumer; 9 | 10 | /** 11 | * A class representing an event listener. 12 | * This class is used to encapsulate event handling logic. 13 | */ 14 | public class EventListener 15 | { 16 | private final Object instance; 17 | private final Method method; 18 | private final int priority; 19 | private final Consumer consumer; 20 | 21 | public EventListener(Object instance, Method method, int priority) 22 | { 23 | this.instance = instance; 24 | this.method = method; 25 | this.priority = priority; 26 | this.consumer = createConsumer(); 27 | } 28 | 29 | /** 30 | * Creates a Consumer to handle the method invocation using lambda metafactory for a higher efficiency. 31 | * 32 | * @return A consumer that accepts an event and invokes the listener method. 33 | */ 34 | @SuppressWarnings("unchecked") 35 | private Consumer createConsumer() 36 | { 37 | try 38 | { 39 | MethodHandles.Lookup lookup = MethodHandles.privateLookupIn(this.method.getDeclaringClass(), MethodHandles.lookup()); 40 | MethodType methodType = MethodType.methodType(void.class, method.getParameters()[0].getType()); 41 | MethodHandle methodHandle = lookup.findVirtual(method.getDeclaringClass(), method.getName(), methodType); 42 | MethodType invokedType = MethodType.methodType(Consumer.class, method.getDeclaringClass()); 43 | MethodHandle lambdaFactory = LambdaMetafactory.metafactory( 44 | lookup, "accept", invokedType, MethodType.methodType(void.class, Object.class), methodHandle, methodType).getTarget(); 45 | return (Consumer) lambdaFactory.invoke(instance); 46 | } catch (Throwable throwable) 47 | { 48 | throw new IllegalStateException(throwable.getMessage()); 49 | } 50 | } 51 | 52 | /** 53 | * Invokes the listener method with the given event. 54 | * 55 | * @param event The event to be passed to the listener method. 56 | */ 57 | public void invoke(Object event) 58 | { 59 | consumer.accept(event); 60 | } 61 | 62 | public Method getMethod() 63 | { 64 | return method; 65 | } 66 | 67 | public Object getInstance() 68 | { 69 | return instance; 70 | } 71 | 72 | public int getPriority() 73 | { 74 | return priority; 75 | } 76 | 77 | } -------------------------------------------------------------------------------- /src/main/java/net/staro/event/bus/api/Listener.java: -------------------------------------------------------------------------------- 1 | package net.staro.event.bus.api; 2 | 3 | import java.lang.annotation.ElementType; 4 | import java.lang.annotation.Retention; 5 | import java.lang.annotation.RetentionPolicy; 6 | import java.lang.annotation.Target; 7 | 8 | /** 9 | * Annotation to mark methods as event listeners. 10 | * The methods are required to be public. 11 | */ 12 | @Retention(RetentionPolicy.RUNTIME) 13 | @Target(ElementType.METHOD) 14 | public @interface Listener 15 | { 16 | Priority priority() default Priority.DEFAULT; 17 | 18 | } 19 | -------------------------------------------------------------------------------- /src/main/java/net/staro/event/bus/api/Priority.java: -------------------------------------------------------------------------------- 1 | package net.staro.event.bus.api; 2 | 3 | import static java.lang.Integer.MAX_VALUE; 4 | 5 | /** 6 | * Represents the priority of an event listener. 7 | */ 8 | public enum Priority 9 | { 10 | MAX(MAX_VALUE), 11 | HIGH(3), 12 | MEDIUM(2), 13 | LOW(1), 14 | DEFAULT(0); 15 | 16 | private final int val; 17 | 18 | Priority(int val) 19 | { 20 | this.val = val; 21 | } 22 | 23 | public int getVal() 24 | { 25 | return val; 26 | } 27 | } -------------------------------------------------------------------------------- /src/test/java/boe/jiden/test/Main.java: -------------------------------------------------------------------------------- 1 | package boe.jiden.test; 2 | 3 | import boe.jiden.test.dummies.DummyEventBus; 4 | import boe.jiden.test.dummies.listener.TestDummyListener; 5 | import boe.jiden.test.event.TestEvent; 6 | 7 | public class Main 8 | { 9 | public static void main(String[] args) 10 | { 11 | final DummyEventBus dummyEventBus = new DummyEventBus(); 12 | dummyEventBus.subscribe(new TestDummyListener()); 13 | var timer = System.currentTimeMillis(); 14 | for (int i = 0; i <= 1000000; i++) 15 | { 16 | dummyEventBus.post(new TestEvent()); 17 | } 18 | 19 | System.out.println(System.currentTimeMillis() - timer); 20 | } 21 | } 22 | -------------------------------------------------------------------------------- /src/test/java/boe/jiden/test/dummies/DummyEventBus.java: -------------------------------------------------------------------------------- 1 | package boe.jiden.test.dummies; 2 | 3 | import net.staro.event.bus.api.EventBus; 4 | 5 | /** 6 | * This Dummy EventBus represents a custom EventBus created withing a project to add more generic listeners to the bus. 7 | * @see DummyGenericListener 8 | */ 9 | public class DummyEventBus extends EventBus 10 | { 11 | public DummyEventBus() 12 | { 13 | super.registerListenerFactory(DummyListener.class, (instance, method) -> 14 | new DummyGenericListener(instance, method, method.getAnnotation(DummyListener.class).priority().getVal()) 15 | ); 16 | } 17 | } 18 | -------------------------------------------------------------------------------- /src/test/java/boe/jiden/test/dummies/DummyGenericListener.java: -------------------------------------------------------------------------------- 1 | package boe.jiden.test.dummies; 2 | 3 | import net.staro.event.bus.api.EventListener; 4 | 5 | import java.lang.reflect.Method; 6 | 7 | /** 8 | * A dummy Listener. 9 | * Override {@code invoke(Object event)} to get additional functionality. 10 | */ 11 | public class DummyGenericListener extends EventListener 12 | { 13 | public DummyGenericListener(Object instance, Method method, int priority) 14 | { 15 | super(instance, method, priority); 16 | } 17 | 18 | @Override 19 | public void invoke(Object event) 20 | { 21 | super.invoke(event); 22 | } 23 | } 24 | -------------------------------------------------------------------------------- /src/test/java/boe/jiden/test/dummies/DummyListener.java: -------------------------------------------------------------------------------- 1 | package boe.jiden.test.dummies; 2 | 3 | import net.staro.event.bus.api.Priority; 4 | 5 | import java.lang.annotation.ElementType; 6 | import java.lang.annotation.Retention; 7 | import java.lang.annotation.RetentionPolicy; 8 | import java.lang.annotation.Target; 9 | 10 | /** 11 | * Annotation for {@link DummyGenericListener}. 12 | */ 13 | @Retention(RetentionPolicy.RUNTIME) 14 | @Target(ElementType.METHOD) 15 | public @interface DummyListener 16 | { 17 | Priority priority() default Priority.DEFAULT; 18 | } 19 | -------------------------------------------------------------------------------- /src/test/java/boe/jiden/test/dummies/event/TestDummyEvent.java: -------------------------------------------------------------------------------- 1 | package boe.jiden.test.dummies.event; 2 | 3 | public class TestDummyEvent 4 | { 5 | } 6 | -------------------------------------------------------------------------------- /src/test/java/boe/jiden/test/dummies/listener/TestDummyListener.java: -------------------------------------------------------------------------------- 1 | package boe.jiden.test.dummies.listener; 2 | 3 | import boe.jiden.test.dummies.DummyListener; 4 | import boe.jiden.test.dummies.event.TestDummyEvent; 5 | 6 | /** 7 | * This should do nothing since DummyGenericListener has an empty {@code invoke(Object event)} method. 8 | */ 9 | public class TestDummyListener 10 | { 11 | @DummyListener 12 | public void invoke(TestDummyEvent ignored) 13 | { 14 | 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /src/test/java/boe/jiden/test/event/TestEvent.java: -------------------------------------------------------------------------------- 1 | package boe.jiden.test.event; 2 | 3 | public class TestEvent 4 | { 5 | } 6 | --------------------------------------------------------------------------------