BAEL-503: initial commit of a simple Spring AMQL example application (#1467)

pom.xml

@@ -115,6 +115,7 @@
         <module>spring-akka</module>
         <module>spring-amqp</module>
         <module>spring-all</module>
+        <module>spring-amqp-simple</module>
         <module>spring-apache-camel</module>
         <module>spring-batch</module>
         <module>spring-boot</module>

spring-amqp-simple/pom.xml

@@ -0,0 +1,46 @@
+<?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>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>1.5.2.RELEASE</version>
+    </parent>
+
+    <groupId>com.baeldung</groupId>
+    <artifactId>spring-amqp-simple</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <name>Spring AMQP Simple App</name>
+
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-amqp</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

spring-amqp-simple/src/main/java/com/baeldung/springamqpsimple/MessageConsumer.java

@@ -0,0 +1,15 @@
+package com.baeldung.springamqpsimple;
+
+import org.apache.log4j.LogManager;
+import org.apache.log4j.Logger;
+import org.springframework.stereotype.Component;
+
+@Component
+public class MessageConsumer {
+
+    private static final Logger logger = LogManager.getLogger(MessageConsumer.class);
+
+    public void receiveMessage(String message) {
+        logger.info("Received Message: " + message);
+    }
+}

spring-amqp-simple/src/main/java/com/baeldung/springamqpsimple/MessageController.java

@@ -0,0 +1,26 @@
+package com.baeldung.springamqpsimple;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+@Controller
+public class MessageController {
+
+    private final MessageProducer messageProducer;
+
+    @Autowired
+    public MessageController(MessageProducer messageProducer) {
+        this.messageProducer = messageProducer;
+    }
+
+    @RequestMapping(value="/messages", method= RequestMethod.POST)
+    @ResponseStatus(value= HttpStatus.CREATED)
+    public void sendMessage(@RequestBody String message) {
+        messageProducer.sendMessage(message);
+    }
+}

spring-amqp-simple/src/main/java/com/baeldung/springamqpsimple/MessageProducer.java

@@ -0,0 +1,20 @@
+package com.baeldung.springamqpsimple;
+
+import org.springframework.amqp.rabbit.core.RabbitTemplate;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class MessageProducer {
+
+    private final RabbitTemplate rabbitTemplate;
+
+    @Autowired
+    public MessageProducer(RabbitTemplate rabbitTemplate) {
+        this.rabbitTemplate = rabbitTemplate;
+    }
+
+    public void sendMessage(String message) {
+        rabbitTemplate.convertAndSend(SpringAmqpConfig.queueName, message);
+    }
+}

spring-amqp-simple/src/main/java/com/baeldung/springamqpsimple/SpringAmqpApplication.java

@@ -0,0 +1,12 @@
+package com.baeldung.springamqpsimple;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringAmqpApplication {
+
+    public static void main(String[] args) throws InterruptedException {
+        SpringApplication.run(SpringAmqpApplication.class, args);
+    }
+}

spring-amqp-simple/src/main/java/com/baeldung/springamqpsimple/SpringAmqpConfig.java

@@ -0,0 +1,48 @@
+package com.baeldung.springamqpsimple;
+
+import org.springframework.amqp.core.*;
+import org.springframework.amqp.rabbit.connection.ConnectionFactory;
+import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
+import org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Profile;
+
+@Configuration
+@Profile("!test")
+public class SpringAmqpConfig {
+
+    public final static String queueName = "com.baeldung.spring-amqp-simple.queue";
+    public final static String exchangeName = "com.baeldung.spring-amqp-simple.exchange";
+
+    @Bean
+    Queue queue() {
+        return new Queue(queueName, false);
+    }
+
+    @Bean
+    Exchange exchange() {
+        return new DirectExchange(exchangeName);
+    }
+
+    @Bean
+    Binding binding(Queue queue, DirectExchange exchange) {
+        return BindingBuilder.bind(queue).to(exchange).with(queueName);
+    }
+
+    @Bean
+    SimpleMessageListenerContainer container(ConnectionFactory connectionFactory,
+                                             MessageListenerAdapter listenerAdapter) {
+        SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
+        container.setConnectionFactory(connectionFactory);
+        container.setQueueNames(queueName);
+        container.setMessageListener(listenerAdapter);
+        return container;
+    }
+
+    @Bean
+    MessageListenerAdapter listenerAdapter(MessageConsumer messageReceiver) {
+        return new MessageListenerAdapter(messageReceiver, "receiveMessage");
+    }
+
+}

spring-amqp-simple/src/main/resources/application.yaml

@@ -0,0 +1,4 @@
+spring:
+  rabbitmq:
+    username: baeldung
+    password: baeldung

spring-amqp-simple/src/test/java/com/baeldung/springamqpsimple/MessageControllerTest.java

@@ -0,0 +1,45 @@
+package com.baeldung.springamqpsimple;
+
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.amqp.rabbit.core.RabbitTemplate;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.verify;
+
+@RunWith(SpringRunner.class)
+@ActiveProfiles("test")
+@SpringBootTest(webEnvironment=SpringBootTest.WebEnvironment.RANDOM_PORT)
+public class MessageControllerTest {
+
+    @Autowired
+    private TestRestTemplate restTemplate;
+
+    @MockBean
+    private RabbitTemplate rabbitTemplate;
+
+    @Test
+    public void whenPostingMessage_thenMessageIsCreated() {
+        final String message = "Hello World!";
+        ResponseEntity<Void> responseEntity = restTemplate.postForEntity("/messages", message, Void.class);
+
+        assertEquals(HttpStatus.CREATED, responseEntity.getStatusCode());
+    }
+
+    @Test
+    public void whenPostingMessage_thenMessageIsSentToBroker() {
+        final String message = "Hello World!";
+        restTemplate.postForEntity("/messages", message, Void.class);
+
+        verify(rabbitTemplate).convertAndSend(SpringAmqpConfig.queueName, message);
+    }
+}