Spring boot sample

akka-sample-spring-extension-java/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>com.typesafe.akka.samples</groupId>
+	<artifactId>akka-sample-spring-extension-java</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<packaging>jar</packaging>
+
+	<name>akka-sample-spring-extension-java</name>
+	<description>Demo project for Spring Boot</description>
+
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>1.5.4.RELEASE</version>
+		<relativePath /> <!-- lookup parent from repository -->
+	</parent>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+		<java.version>1.8</java.version>
+		<scala.version>2.12</scala.version>
+		<akka.version>2.5.6</akka.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>com.typesafe.akka</groupId>
+			<artifactId>akka-actor_${scala.version}</artifactId>
+			<version>${akka.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>com.typesafe.akka</groupId>
+			<artifactId>akka-slf4j_${scala.version}</artifactId>
+			<version>${akka.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>javax.inject</groupId>
+			<artifactId>javax.inject</artifactId>
+			<version>1</version>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-tomcat</artifactId>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+
+</project>

akka-sample-spring-extension-java/src/main/java/org/example/App.java

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+package org.example;
+
+import org.example.akka.di.SpringExtension;
+import org.example.akka.message.Message;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ConfigurableApplicationContext;
+
+import akka.actor.ActorRef;
+import akka.actor.ActorSystem;
+
+@SpringBootApplication
+public class App {
+
+	public static void main(String[] args) {
+		ConfigurableApplicationContext context = SpringApplication.run(App.class, args);
+		ActorSystem system = context.getBean("actorSystem", ActorSystem.class);
+		SpringExtension springExtension = context.getBean("springExtension", SpringExtension.class);
+
+		// Using constructor with parameters.
+		ActorRef myActor1 = system.actorOf(springExtension.props("myActor", "Parametrized", 100), "MyActor1");
+		myActor1.tell(new Message(), ActorRef.noSender());
+
+		// Using constructor with no parameters
+		ActorRef myActor2 = system.actorOf(springExtension.props("myActor"), "MyActor2");
+		myActor2.tell(new Message(), ActorRef.noSender());
+
+	}
+}

akka-sample-spring-extension-java/src/main/java/org/example/akka/AkkaConfig.java

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+package org.example.akka;
+
+import akka.actor.ActorSystem;
+import com.typesafe.config.Config;
+import com.typesafe.config.ConfigFactory;
+
+import org.example.akka.di.SpringExtension;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class AkkaConfig {
+
+	@Autowired
+	private ApplicationContext applicationContext;
+
+	@Autowired
+	private SpringExtension springExtension;
+
+	@Bean(destroyMethod = "terminate")
+	public ActorSystem actorSystem() {
+		ActorSystem actorSystem = ActorSystem.create("akka-system", akkaConfiguration());
+		springExtension.initialize(applicationContext);
+		return actorSystem;
+	}
+
+	@Bean
+	public Config akkaConfiguration() {
+		return ConfigFactory.load();
+	}
+}

akka-sample-spring-extension-java/src/main/java/org/example/akka/actor/MyActor.java

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+package org.example.akka.actor;
+
+import javax.inject.Named;
+
+import org.example.akka.message.Message;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Scope;
+
+import akka.actor.AbstractActor;
+
+@Named("myActor")
+@Scope("prototype")
+public class MyActor extends AbstractActor {
+
+	@Autowired
+	private MyActorService myActorService;
+
+	private String attribute;
+	private Integer attribute2;
+
+	public MyActor(String attribute, Integer attribute2) {
+		super();
+		this.attribute = attribute;
+		this.attribute2 = attribute2;
+	}
+
+	public MyActor() {
+		this.attribute = "Default value";
+		this.attribute2 = Integer.MAX_VALUE;
+	}
+
+	@Override
+	public Receive createReceive() {
+		return receiveBuilder().match(Message.class, msg -> {
+			myActorService.printService(getSelf().path() + " " + attribute + " " + attribute2);
+		}).build();
+	}
+}

akka-sample-spring-extension-java/src/main/java/org/example/akka/actor/MyActorService.java

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+package org.example.akka.actor;
+
+import javax.annotation.PostConstruct;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class MyActorService {
+
+	public MyActorService() {
+
+	}
+
+	@PostConstruct
+	public void init() {
+		System.out.println("Created service as bean");
+	}
+
+	public void printService(String string) {
+		System.out.println("Printed with bean: " + string);
+	}
+}

akka-sample-spring-extension-java/src/main/java/org/example/akka/di/SpringActorProducer.java

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+package org.example.akka.di;
+
+import akka.actor.Actor;
+import akka.actor.IndirectActorProducer;
+import org.springframework.context.ApplicationContext;
+
+public class SpringActorProducer implements IndirectActorProducer {
+
+	final private ApplicationContext applicationContext;
+	final private String actorBeanName;
+	final private Object[] args;
+
+	public SpringActorProducer(ApplicationContext applicationContext, String actorBeanName) {
+		this.applicationContext = applicationContext;
+		this.actorBeanName = actorBeanName;
+		this.args = null;
+	}
+
+	public SpringActorProducer(ApplicationContext applicationContext, String actorBeanName, Object... args) {
+		this.applicationContext = applicationContext;
+		this.actorBeanName = actorBeanName;
+		this.args = args;
+	}
+
+	@Override
+	public Actor produce() {
+		if (args == null) {
+			return (Actor) applicationContext.getBean(actorBeanName);
+		} else {
+			return (Actor) applicationContext.getBean(actorBeanName, args);
+		}
+	}
+
+	@Override
+	public Class<? extends Actor> actorClass() {
+		return (Class<? extends Actor>) applicationContext.getType(actorBeanName);
+	}
+}

akka-sample-spring-extension-java/src/main/java/org/example/akka/di/SpringExtension.java

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+package org.example.akka.di;
+
+import akka.actor.Extension;
+import akka.actor.Props;
+import org.springframework.context.ApplicationContext;
+import org.springframework.stereotype.Component;
+
+@Component
+public class SpringExtension implements Extension {
+
+	private ApplicationContext applicationContext;
+
+	public void initialize(ApplicationContext applicationContext) {
+		this.applicationContext = applicationContext;
+	}
+
+	public Props props(String actorBeanName) {
+		return Props.create(SpringActorProducer.class, applicationContext, actorBeanName);
+	}
+
+	public Props props(String actorBeanName, Object... args) {
+		return Props.create(SpringActorProducer.class, applicationContext, actorBeanName, args);
+	}
+}

akka-sample-spring-extension-java/src/main/java/org/example/akka/message/Message.java

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+package org.example.akka.message;
+
+import java.io.Serializable;
+
+public class Message implements Serializable {
+
+	private static final long serialVersionUID = 713662864902548777L;
+
+}