Merge branch 'master' of https://github.com/JonCook/tutorials

spring-akka/README.md

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+## Spring Akka
+
+This module contains articles about Spring with Akka
+
+### Relevant Articles:
+- [Introduction to Spring with Akka](https://www.baeldung.com/akka-with-spring)

spring-akka/pom.xml

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+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+    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.baeldung</groupId>
+    <artifactId>spring-akka</artifactId>
+    <version>0.1-SNAPSHOT</version>
+    <name>spring-akka</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.typesafe.akka</groupId>
+            <artifactId>akka-actor_${scala.version}</artifactId>
+            <version>${akka.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework</groupId>
+                <artifactId>spring-framework-bom</artifactId>
+                <version>${spring.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <properties>
+        <spring.version>4.3.4.RELEASE</spring.version>
+        <akka.version>2.4.14</akka.version>
+        <scala.version>2.11</scala.version>
+    </properties>
+
+</project>

spring-akka/src/main/java/org/baeldung/akka/AppConfiguration.java

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+package org.baeldung.akka;
+
+import akka.actor.ActorSystem;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+import static org.baeldung.akka.SpringExtension.SPRING_EXTENSION_PROVIDER;
+
+@Configuration
+@ComponentScan
+public class AppConfiguration {
+
+    @Autowired
+    private ApplicationContext applicationContext;
+
+    @Bean
+    public ActorSystem actorSystem() {
+        ActorSystem system = ActorSystem.create("akka-spring-demo");
+        SPRING_EXTENSION_PROVIDER.get(system).initialize(applicationContext);
+        return system;
+    }
+
+}

spring-akka/src/main/java/org/baeldung/akka/GreetingActor.java

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+package org.baeldung.akka;
+
+import akka.actor.UntypedActor;
+import org.springframework.beans.factory.config.ConfigurableBeanFactory;
+import org.springframework.context.annotation.Scope;
+import org.springframework.stereotype.Component;
+
+@Component
+@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
+public class GreetingActor extends UntypedActor {
+
+    private GreetingService greetingService;
+
+    public GreetingActor(GreetingService greetingService) {
+        this.greetingService = greetingService;
+    }
+
+    @Override
+    public void onReceive(Object message) throws Throwable {
+        if (message instanceof Greet) {
+            String name = ((Greet) message).getName();
+            getSender().tell(greetingService.greet(name), getSelf());
+        } else {
+            unhandled(message);
+        }
+    }
+
+    public static class Greet {
+
+        private String name;
+
+        public Greet(String name) {
+            this.name = name;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+    }
+
+}

spring-akka/src/main/java/org/baeldung/akka/GreetingService.java

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+package org.baeldung.akka;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class GreetingService {
+
+    public String greet(String name) {
+        return "Hello, " + name;
+    }
+
+}

spring-akka/src/main/java/org/baeldung/akka/SpringActorProducer.java

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+package org.baeldung.akka;
+
+import akka.actor.Actor;
+import akka.actor.IndirectActorProducer;
+import org.springframework.context.ApplicationContext;
+
+public class SpringActorProducer implements IndirectActorProducer {
+
+    private ApplicationContext applicationContext;
+
+    private String beanActorName;
+
+    public SpringActorProducer(ApplicationContext applicationContext, String beanActorName) {
+        this.applicationContext = applicationContext;
+        this.beanActorName = beanActorName;
+    }
+
+    @Override
+    public Actor produce() {
+        return (Actor) applicationContext.getBean(beanActorName);
+    }
+
+    @Override
+    public Class<? extends Actor> actorClass() {
+        return (Class<? extends Actor>) applicationContext.getType(beanActorName);
+    }
+
+}

spring-akka/src/main/java/org/baeldung/akka/SpringExtension.java

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+package org.baeldung.akka;
+
+import akka.actor.AbstractExtensionId;
+import akka.actor.ExtendedActorSystem;
+import akka.actor.Extension;
+import akka.actor.Props;
+import org.springframework.context.ApplicationContext;
+
+public class SpringExtension extends AbstractExtensionId<SpringExtension.SpringExt> {
+
+    public static final SpringExtension SPRING_EXTENSION_PROVIDER = new SpringExtension();
+
+    @Override
+    public SpringExt createExtension(ExtendedActorSystem system) {
+        return new SpringExt();
+    }
+
+    public static class SpringExt implements Extension {
+
+        private volatile ApplicationContext applicationContext;
+
+        public void initialize(ApplicationContext applicationContext) {
+            this.applicationContext = applicationContext;
+        }
+
+        public Props props(String actorBeanName) {
+            return Props.create(SpringActorProducer.class, applicationContext, actorBeanName);
+        }
+
+    }
+
+}

spring-akka/src/main/resources/logback.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-akka/src/test/java/org/baeldung/akka/SpringAkkaIntegrationTest.java

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+package org.baeldung.akka;
+
+import java.util.concurrent.TimeUnit;
+
+import akka.actor.ActorRef;
+import akka.actor.ActorSystem;
+import akka.util.Timeout;
+import org.baeldung.akka.GreetingActor.Greet;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;
+import scala.concurrent.Await;
+import scala.concurrent.Future;
+import scala.concurrent.duration.FiniteDuration;
+
+import static akka.pattern.Patterns.ask;
+import static org.baeldung.akka.SpringExtension.SPRING_EXTENSION_PROVIDER;
+
+@ContextConfiguration(classes = AppConfiguration.class)
+public class SpringAkkaIntegrationTest extends AbstractJUnit4SpringContextTests {
+
+    @Autowired
+    private ActorSystem system;
+
+    @Test
+    public void whenCallingGreetingActor_thenActorGreetsTheCaller() throws Exception {
+        ActorRef greeter = system.actorOf(SPRING_EXTENSION_PROVIDER.get(system).props("greetingActor"), "greeter");
+
+        FiniteDuration duration = FiniteDuration.create(1, TimeUnit.SECONDS);
+        Timeout timeout = Timeout.durationToTimeout(duration);
+
+        Future<Object> result = ask(greeter, new Greet("John"), timeout);
+
+        Assert.assertEquals("Hello, John", Await.result(result, duration));
+    }
+
+    @After
+    public void tearDown() {
+        system.shutdown();
+        system.awaitTermination();
+    }
+
+}