diff --git a/spring-boot/starter/application/application.yml b/spring-boot/starter/application/application.yml new file mode 100644 index 0000000..a5b7344 --- /dev/null +++ b/spring-boot/starter/application/application.yml @@ -0,0 +1,4 @@ +eventstarter: + listener: + enabled-events: + - foo \ No newline at end of file diff --git a/spring-boot/starter/application/build.gradle b/spring-boot/starter/application/build.gradle new file mode 100644 index 0000000..9d8539d --- /dev/null +++ b/spring-boot/starter/application/build.gradle @@ -0,0 +1,22 @@ +plugins { + id 'org.springframework.boot' version '2.1.7.RELEASE' + id 'io.spring.dependency-management' version '1.0.8.RELEASE' + id 'java' +} + +group = 'io.reflectoring' +version = '0.0.1-SNAPSHOT' +sourceCompatibility = '11' + +repositories { + mavenCentral() +} + +dependencies { + implementation project(':event-starter') + implementation 'org.springframework.boot:spring-boot-starter-web' + testImplementation 'org.springframework.boot:spring-boot-starter-test' + + compileOnly('org.projectlombok:lombok:1.18.2') + annotationProcessor 'org.projectlombok:lombok:1.18.2' +} diff --git a/spring-boot/starter/application/src/main/java/io/reflectoring/starter/EventGenerator.java b/spring-boot/starter/application/src/main/java/io/reflectoring/starter/EventGenerator.java new file mode 100644 index 0000000..8a9e1a8 --- /dev/null +++ b/spring-boot/starter/application/src/main/java/io/reflectoring/starter/EventGenerator.java @@ -0,0 +1,21 @@ +package io.reflectoring.starter; + +import org.springframework.scheduling.annotation.Scheduled; +import org.springframework.stereotype.Component; + +@Component +class EventGenerator { + + private final EventPublisher eventPublisher; + + public EventGenerator(EventPublisher eventPublisher) { + this.eventPublisher = eventPublisher; + } + + @Scheduled(fixedRate = 2000) + void generateEvent() { + Event event = new Event("foo", "This is a foo event"); + eventPublisher.publishEvent(event); + } + +} diff --git a/spring-boot/starter/application/src/main/java/io/reflectoring/starter/FooEventListener.java b/spring-boot/starter/application/src/main/java/io/reflectoring/starter/FooEventListener.java new file mode 100644 index 0000000..1ddc880 --- /dev/null +++ b/spring-boot/starter/application/src/main/java/io/reflectoring/starter/FooEventListener.java @@ -0,0 +1,23 @@ +package io.reflectoring.starter; + +import lombok.extern.slf4j.Slf4j; +import org.springframework.stereotype.Component; + +@Slf4j +@Component +class FooEventListener extends EventListener { + + public FooEventListener(EventListenerProperties properties) { + super(properties); + } + + @Override + public String getSubscribedEventType() { + return "foo"; + } + + @Override + public void onEvent(Event event) { + log.info("received event {}", event); + } +} diff --git a/spring-boot/starter/application/src/main/java/io/reflectoring/starter/StarterApplication.java b/spring-boot/starter/application/src/main/java/io/reflectoring/starter/StarterApplication.java new file mode 100644 index 0000000..124a93b --- /dev/null +++ b/spring-boot/starter/application/src/main/java/io/reflectoring/starter/StarterApplication.java @@ -0,0 +1,15 @@ +package io.reflectoring.starter; + +import org.springframework.boot.SpringApplication; +import org.springframework.boot.autoconfigure.SpringBootApplication; +import org.springframework.scheduling.annotation.EnableScheduling; + +@SpringBootApplication +@EnableScheduling +public class StarterApplication { + + public static void main(String[] args) { + SpringApplication.run(StarterApplication.class, args); + } + +} diff --git a/spring-boot/starter/application/src/main/resources/application.properties b/spring-boot/starter/application/src/main/resources/application.properties new file mode 100644 index 0000000..dc21478 --- /dev/null +++ b/spring-boot/starter/application/src/main/resources/application.properties @@ -0,0 +1,2 @@ +eventstarter.enabled=true +event \ No newline at end of file diff --git a/spring-boot/starter/application/src/test/java/io/reflectoring/starter/StarterApplicationTests.java b/spring-boot/starter/application/src/test/java/io/reflectoring/starter/StarterApplicationTests.java new file mode 100644 index 0000000..d9accf0 --- /dev/null +++ b/spring-boot/starter/application/src/test/java/io/reflectoring/starter/StarterApplicationTests.java @@ -0,0 +1,22 @@ +package io.reflectoring.starter; + +import org.junit.Test; +import org.junit.runner.RunWith; +import org.springframework.beans.factory.annotation.Autowired; +import org.springframework.boot.test.context.SpringBootTest; +import org.springframework.test.context.junit4.SpringRunner; +import static org.assertj.core.api.Assertions.*; + +@RunWith(SpringRunner.class) +@SpringBootTest +public class StarterApplicationTests { + + @Autowired(required = false) + private EventPublisher eventPublisher; + + @Test + public void eventPublisherIsAvailable() { + assertThat(eventPublisher).isNotNull(); + } + +} diff --git a/spring-boot/starter/build.gradle b/spring-boot/starter/build.gradle new file mode 100644 index 0000000..e69de29 diff --git a/spring-boot/starter/event-starter/build.gradle b/spring-boot/starter/event-starter/build.gradle new file mode 100644 index 0000000..28bf092 --- /dev/null +++ b/spring-boot/starter/event-starter/build.gradle @@ -0,0 +1,30 @@ +plugins { + id 'io.spring.dependency-management' version '1.0.8.RELEASE' + id 'java' +} + +group = 'io.reflectoring' +version = '0.0.1-SNAPSHOT' +sourceCompatibility = '11' + +repositories { + mavenCentral() +} + +dependencyManagement { + imports { + mavenBom("org.springframework.boot:spring-boot-dependencies:2.1.7.RELEASE") + } +} + +dependencies { + compileOnly 'org.springframework.boot:spring-boot-starter' + annotationProcessor 'org.springframework.boot:spring-boot-autoconfigure-processor' + annotationProcessor 'org.springframework.boot:spring-boot-configuration-processor' + testImplementation 'org.springframework.boot:spring-boot-starter-test' + + compileOnly('org.projectlombok:lombok:1.18.2') + annotationProcessor 'org.projectlombok:lombok:1.18.2' +} + +compileJava.dependsOn(processResources) diff --git a/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/Event.java b/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/Event.java new file mode 100644 index 0000000..c945b9e --- /dev/null +++ b/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/Event.java @@ -0,0 +1,13 @@ +package io.reflectoring.starter; + +import lombok.ToString; +import lombok.Value; + +@Value +@ToString +class Event { + + private String type; + private String payload; + +} diff --git a/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/EventAutoConfiguration.java b/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/EventAutoConfiguration.java new file mode 100644 index 0000000..dfba01f --- /dev/null +++ b/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/EventAutoConfiguration.java @@ -0,0 +1,20 @@ +package io.reflectoring.starter; + +import java.util.List; + +import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty; +import org.springframework.boot.context.properties.EnableConfigurationProperties; +import org.springframework.context.annotation.Bean; +import org.springframework.context.annotation.Configuration; + +@Configuration +@ConditionalOnProperty(value = "eventstarter.enabled", havingValue = "true") +@EnableConfigurationProperties(EventListenerProperties.class) +class EventAutoConfiguration { + + @Bean + EventPublisher eventPublisher(List listeners){ + return new EventPublisher(listeners); + } + +} diff --git a/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/EventListener.java b/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/EventListener.java new file mode 100644 index 0000000..c69ecec --- /dev/null +++ b/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/EventListener.java @@ -0,0 +1,32 @@ +package io.reflectoring.starter; + +import lombok.RequiredArgsConstructor; + +/** + * Interface to be implemented for all event types that the application should react to. + * EventListeners will be automatically included when they are part of the application context. + */ +@RequiredArgsConstructor +public abstract class EventListener { + + private final EventListenerProperties properties; + + public void receive(Event event) { + if(isEnabled(event) && isSubscribed(event)){ + onEvent(event); + } + } + + private boolean isSubscribed(Event event) { + return event.getType().equals(getSubscribedEventType()); + } + + private boolean isEnabled(Event event) { + return properties.getEnabledEvents().contains(event.getType()); + } + + protected abstract String getSubscribedEventType(); + + protected abstract void onEvent(Event event); + +} diff --git a/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/EventListenerProperties.java b/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/EventListenerProperties.java new file mode 100644 index 0000000..39f64d8 --- /dev/null +++ b/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/EventListenerProperties.java @@ -0,0 +1,19 @@ +package io.reflectoring.starter; + +import java.util.Collections; +import java.util.List; + +import lombok.Data; +import org.springframework.boot.context.properties.ConfigurationProperties; + +@ConfigurationProperties(prefix = "eventstarter.listener") +@Data +class EventListenerProperties { + + /** + * List of event types that will be passed to {@link EventListener} implementations. All other events + * will be ignored. + */ + private List enabledEvents = Collections.emptyList(); + +} diff --git a/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/EventPublisher.java b/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/EventPublisher.java new file mode 100644 index 0000000..5827862 --- /dev/null +++ b/spring-boot/starter/event-starter/src/main/java/io/reflectoring/starter/EventPublisher.java @@ -0,0 +1,28 @@ +package io.reflectoring.starter; + + +import java.util.List; + +import lombok.RequiredArgsConstructor; +import lombok.extern.slf4j.Slf4j; + +/** + * Dummy implementation of an event publisher. Simply publishes an event to all listeners that + * are subscribed to that event. This solution obviously doesn't work + * across JVM-boundaries... . + */ +@Slf4j +@RequiredArgsConstructor +public class EventPublisher { + + private final List listeners; + + public void publishEvent(Event event) { + log.info("publishing event: {}", event); + for (EventListener listener : listeners) { + listener.receive(event); + } + } + + +} diff --git a/spring-boot/starter/event-starter/src/main/resources/META-INF/spring.factories b/spring-boot/starter/event-starter/src/main/resources/META-INF/spring.factories new file mode 100644 index 0000000..dec84f0 --- /dev/null +++ b/spring-boot/starter/event-starter/src/main/resources/META-INF/spring.factories @@ -0,0 +1,2 @@ +org.springframework.boot.autoconfigure.EnableAutoConfiguration=\ + io.reflectoring.starter.EventAutoConfiguration \ No newline at end of file diff --git a/spring-boot/starter/gradle/wrapper/gradle-wrapper.jar b/spring-boot/starter/gradle/wrapper/gradle-wrapper.jar new file mode 100644 index 0000000..5c2d1cf Binary files /dev/null and b/spring-boot/starter/gradle/wrapper/gradle-wrapper.jar differ diff --git a/spring-boot/starter/gradle/wrapper/gradle-wrapper.properties b/spring-boot/starter/gradle/wrapper/gradle-wrapper.properties new file mode 100644 index 0000000..ef9a9e0 --- /dev/null +++ b/spring-boot/starter/gradle/wrapper/gradle-wrapper.properties @@ -0,0 +1,5 @@ +distributionBase=GRADLE_USER_HOME +distributionPath=wrapper/dists +distributionUrl=https\://services.gradle.org/distributions/gradle-5.6-bin.zip +zipStoreBase=GRADLE_USER_HOME +zipStorePath=wrapper/dists diff --git a/spring-boot/starter/gradlew b/spring-boot/starter/gradlew new file mode 100644 index 0000000..83f2acf --- /dev/null +++ b/spring-boot/starter/gradlew @@ -0,0 +1,188 @@ +#!/usr/bin/env sh + +# +# Copyright 2015 the original author or authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +############################################################################## +## +## Gradle start up script for UN*X +## +############################################################################## + +# Attempt to set APP_HOME +# Resolve links: $0 may be a link +PRG="$0" +# Need this for relative symlinks. +while [ -h "$PRG" ] ; do + ls=`ls -ld "$PRG"` + link=`expr "$ls" : '.*-> \(.*\)$'` + if expr "$link" : '/.*' > /dev/null; then + PRG="$link" + else + PRG=`dirname "$PRG"`"/$link" + fi +done +SAVED="`pwd`" +cd "`dirname \"$PRG\"`/" >/dev/null +APP_HOME="`pwd -P`" +cd "$SAVED" >/dev/null + +APP_NAME="Gradle" +APP_BASE_NAME=`basename "$0"` + +# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' + +# Use the maximum available, or set MAX_FD != -1 to use that value. +MAX_FD="maximum" + +warn () { + echo "$*" +} + +die () { + echo + echo "$*" + echo + exit 1 +} + +# OS specific support (must be 'true' or 'false'). +cygwin=false +msys=false +darwin=false +nonstop=false +case "`uname`" in + CYGWIN* ) + cygwin=true + ;; + Darwin* ) + darwin=true + ;; + MINGW* ) + msys=true + ;; + NONSTOP* ) + nonstop=true + ;; +esac + +CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar + +# Determine the Java command to use to start the JVM. +if [ -n "$JAVA_HOME" ] ; then + if [ -x "$JAVA_HOME/jre/sh/java" ] ; then + # IBM's JDK on AIX uses strange locations for the executables + JAVACMD="$JAVA_HOME/jre/sh/java" + else + JAVACMD="$JAVA_HOME/bin/java" + fi + if [ ! -x "$JAVACMD" ] ; then + die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +else + JAVACMD="java" + which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." +fi + +# Increase the maximum file descriptors if we can. +if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then + MAX_FD_LIMIT=`ulimit -H -n` + if [ $? -eq 0 ] ; then + if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then + MAX_FD="$MAX_FD_LIMIT" + fi + ulimit -n $MAX_FD + if [ $? -ne 0 ] ; then + warn "Could not set maximum file descriptor limit: $MAX_FD" + fi + else + warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" + fi +fi + +# For Darwin, add options to specify how the application appears in the dock +if $darwin; then + GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" +fi + +# For Cygwin or MSYS, switch paths to Windows format before running java +if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then + APP_HOME=`cygpath --path --mixed "$APP_HOME"` + CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` + JAVACMD=`cygpath --unix "$JAVACMD"` + + # We build the pattern for arguments to be converted via cygpath + ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` + SEP="" + for dir in $ROOTDIRSRAW ; do + ROOTDIRS="$ROOTDIRS$SEP$dir" + SEP="|" + done + OURCYGPATTERN="(^($ROOTDIRS))" + # Add a user-defined pattern to the cygpath arguments + if [ "$GRADLE_CYGPATTERN" != "" ] ; then + OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" + fi + # Now convert the arguments - kludge to limit ourselves to /bin/sh + i=0 + for arg in "$@" ; do + CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` + CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option + + if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition + eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` + else + eval `echo args$i`="\"$arg\"" + fi + i=$((i+1)) + done + case $i in + (0) set -- ;; + (1) set -- "$args0" ;; + (2) set -- "$args0" "$args1" ;; + (3) set -- "$args0" "$args1" "$args2" ;; + (4) set -- "$args0" "$args1" "$args2" "$args3" ;; + (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; + (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; + (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; + (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; + (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; + esac +fi + +# Escape application args +save () { + for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done + echo " " +} +APP_ARGS=$(save "$@") + +# Collect all arguments for the java command, following the shell quoting and substitution rules +eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" + +# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong +if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then + cd "$(dirname "$0")" +fi + +exec "$JAVACMD" "$@" diff --git a/spring-boot/starter/gradlew.bat b/spring-boot/starter/gradlew.bat new file mode 100644 index 0000000..9618d8d --- /dev/null +++ b/spring-boot/starter/gradlew.bat @@ -0,0 +1,100 @@ +@rem +@rem Copyright 2015 the original author or authors. +@rem +@rem Licensed under the Apache License, Version 2.0 (the "License"); +@rem you may not use this file except in compliance with the License. +@rem You may obtain a copy of the License at +@rem +@rem https://www.apache.org/licenses/LICENSE-2.0 +@rem +@rem Unless required by applicable law or agreed to in writing, software +@rem distributed under the License is distributed on an "AS IS" BASIS, +@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +@rem See the License for the specific language governing permissions and +@rem limitations under the License. +@rem + +@if "%DEBUG%" == "" @echo off +@rem ########################################################################## +@rem +@rem Gradle startup script for Windows +@rem +@rem ########################################################################## + +@rem Set local scope for the variables with windows NT shell +if "%OS%"=="Windows_NT" setlocal + +set DIRNAME=%~dp0 +if "%DIRNAME%" == "" set DIRNAME=. +set APP_BASE_NAME=%~n0 +set APP_HOME=%DIRNAME% + +@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" + +@rem Find java.exe +if defined JAVA_HOME goto findJavaFromJavaHome + +set JAVA_EXE=java.exe +%JAVA_EXE% -version >NUL 2>&1 +if "%ERRORLEVEL%" == "0" goto init + +echo. +echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:findJavaFromJavaHome +set JAVA_HOME=%JAVA_HOME:"=% +set JAVA_EXE=%JAVA_HOME%/bin/java.exe + +if exist "%JAVA_EXE%" goto init + +echo. +echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:init +@rem Get command-line arguments, handling Windows variants + +if not "%OS%" == "Windows_NT" goto win9xME_args + +:win9xME_args +@rem Slurp the command line arguments. +set CMD_LINE_ARGS= +set _SKIP=2 + +:win9xME_args_slurp +if "x%~1" == "x" goto execute + +set CMD_LINE_ARGS=%* + +:execute +@rem Setup the command line + +set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar + +@rem Execute Gradle +"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% + +:end +@rem End local scope for the variables with windows NT shell +if "%ERRORLEVEL%"=="0" goto mainEnd + +:fail +rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of +rem the _cmd.exe /c_ return code! +if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 +exit /b 1 + +:mainEnd +if "%OS%"=="Windows_NT" endlocal + +:omega diff --git a/spring-boot/starter/settings.gradle b/spring-boot/starter/settings.gradle new file mode 100644 index 0000000..525e788 --- /dev/null +++ b/spring-boot/starter/settings.gradle @@ -0,0 +1,2 @@ +include 'event-starter' +include 'application'