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BAEL-719: Intro to Spring Cloud Stream

This commit is contained in:
Jose Carvajal 2017-10-08 08:17:24 +02:00
parent 310088914c
commit 57a993de64
13 changed files with 467 additions and 0 deletions
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2
spring-cloud/pom.xml
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@ -16,6 +16,7 @@
<module>spring-cloud-rest</module>
<module>spring-cloud-zookeeper</module>
<module>spring-cloud-gateway</module>
<module>spring-cloud-stream</module>
</modules>
<packaging>pom</packaging>
@ -37,6 +38,7 @@
<spring-cloud-starter-eureka.version>1.2.3.RELEASE</spring-cloud-starter-eureka.version>
<spring-cloud-starter-feign.version>1.2.3.RELEASE</spring-cloud-starter-feign.version>
<spring-cloud-starter-hystrix.version>1.2.3.RELEASE</spring-cloud-starter-hystrix.version>
<spring-cloud-stream.version>1.3.0.RELEASE</spring-cloud-stream.version>
<spring-boot-starter-web.version>1.4.2.RELEASE</spring-boot-starter-web.version>
<maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
<spring-boot-maven-plugin.version>1.4.2.RELEASE</spring-boot-maven-plugin.version>

70
spring-cloud/spring-cloud-stream/pom.xml Normal file
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@ -0,0 +1,70 @@
<?xml version="1.0" encoding="UTF-8"?>
<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>org.baeldung</groupId>
<artifactId>spring-cloud-stream</artifactId>
<modules>
<module>spring-cloud-stream-rabbit</module>
</modules>
<packaging>pom</packaging>
<name>spring-cloud-stream</name>
<parent>
<groupId>com.baeldung.spring.cloud</groupId>
<artifactId>spring-cloud</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-stream-rabbit</artifactId>
<version>${spring-cloud-stream.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream</artifactId>
<version>${spring-cloud-stream.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-test-support</artifactId>
<version>${spring-cloud-stream.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>${spring-boot-maven-plugin.version}</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>

33
spring-cloud/spring-cloud-stream/spring-cloud-stream-rabbit/pom.xml Normal file
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@ -0,0 +1,33 @@
<?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>
<artifactId>spring-cloud-stream-rabbit</artifactId>
<packaging>jar</packaging>
<name>spring-cloud-stream-rabbit</name>
<description>Simple Spring Cloud Stream</description>
<parent>
<groupId>org.baeldung</groupId>
<artifactId>spring-cloud-stream</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>..</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-stream-rabbit</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-test-support</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
</project>

38
spring-cloud/spring-cloud-stream/spring-cloud-stream-rabbit/src/main/java/com/baeldung/spring/cloud/stream/rabbit/MultipleOutputsServiceApplication.java Normal file
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@ -0,0 +1,38 @@
package com.baeldung.spring.cloud.stream.rabbit;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.MessageBuilder;
import com.baeldung.spring.cloud.stream.rabbit.processor.MyProcessor;
@SpringBootApplication
@EnableBinding(MyProcessor.class)
public class MultipleOutputsServiceApplication {
public static void main(String[] args) {
SpringApplication.run(MultipleOutputsServiceApplication.class, args);
}
@Autowired
private MyProcessor processor;
@StreamListener(MyProcessor.INPUT)
public void routeValues(Integer val) {
if (val < 10) {
processor.anOutput()
.send(message(val));
} else {
processor.anotherOutput()
.send(message(val));
}
}
private static final <T> Message<T> message(T val) {
return MessageBuilder.withPayload(val)
.build();
}
}

39
spring-cloud/spring-cloud-stream/spring-cloud-stream-rabbit/src/main/java/com/baeldung/spring/cloud/stream/rabbit/MultipleOutputsWithConditionsServiceApplication.java Normal file
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@ -0,0 +1,39 @@
package com.baeldung.spring.cloud.stream.rabbit;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.MessageBuilder;
import com.baeldung.spring.cloud.stream.rabbit.processor.MyProcessor;
@SpringBootApplication
@EnableBinding(MyProcessor.class)
public class MultipleOutputsWithConditionsServiceApplication {
public static void main(String[] args) {
SpringApplication.run(MultipleOutputsWithConditionsServiceApplication.class, args);
}
@Autowired
private MyProcessor processor;
@StreamListener(target = MyProcessor.INPUT, condition = "payload < 10")
public void routeValuesToAnOutput(Integer val) {
processor.anOutput()
.send(message(val));
}
@StreamListener(target = MyProcessor.INPUT, condition = "payload >= 10")
public void routeValuesToAnotherOutput(Integer val) {
processor.anotherOutput()
.send(message(val));
}
private static final <T> Message<T> message(T val) {
return MessageBuilder.withPayload(val)
.build();
}
}

32
spring-cloud/spring-cloud-stream/spring-cloud-stream-rabbit/src/main/java/com/baeldung/spring/cloud/stream/rabbit/MyLoggerServiceApplication.java Normal file
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@ -0,0 +1,32 @@
package com.baeldung.spring.cloud.stream.rabbit;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.cloud.stream.messaging.Processor;
import org.springframework.context.annotation.Bean;
import org.springframework.messaging.converter.MessageConverter;
import org.springframework.messaging.handler.annotation.SendTo;
import com.baeldung.spring.cloud.stream.rabbit.messages.TextPlainMessageConverter;
import com.baeldung.spring.cloud.stream.rabbit.model.LogMessage;
@SpringBootApplication
@EnableBinding(Processor.class)
public class MyLoggerServiceApplication {
public static void main(String[] args) {
SpringApplication.run(MyLoggerServiceApplication.class, args);
}
@Bean
public MessageConverter providesTextPlainMessageConverter() {
return new TextPlainMessageConverter();
}
@StreamListener(Processor.INPUT)
@SendTo(Processor.OUTPUT)
public LogMessage enrichLogMessage(LogMessage log) {
return new LogMessage(String.format("[1]: %s", log.getMessage()));
}
}

26
spring-cloud/spring-cloud-stream/spring-cloud-stream-rabbit/src/main/java/com/baeldung/spring/cloud/stream/rabbit/messages/TextPlainMessageConverter.java Normal file
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@ -0,0 +1,26 @@
package com.baeldung.spring.cloud.stream.rabbit.messages;
import org.springframework.messaging.Message;
import org.springframework.messaging.converter.AbstractMessageConverter;
import org.springframework.util.MimeType;
import com.baeldung.spring.cloud.stream.rabbit.model.LogMessage;
public class TextPlainMessageConverter extends AbstractMessageConverter {
public TextPlainMessageConverter() {
super(new MimeType("text", "plain"));
}
@Override
protected boolean supports(Class<?> clazz) {
return (LogMessage.class == clazz);
}
@Override
protected Object convertFromInternal(Message<?> message, Class<?> targetClass, Object conversionHint) {
Object payload = message.getPayload();
String text = payload instanceof String ? (String) payload : new String((byte[]) payload);
return new LogMessage(text);
}
}

32
spring-cloud/spring-cloud-stream/spring-cloud-stream-rabbit/src/main/java/com/baeldung/spring/cloud/stream/rabbit/model/LogMessage.java Normal file
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@ -0,0 +1,32 @@
package com.baeldung.spring.cloud.stream.rabbit.model;
import java.io.Serializable;
public class LogMessage implements Serializable {
private static final long serialVersionUID = -5857383701708275796L;
private String message;
public LogMessage() {
}
public LogMessage(String message) {
this.message = message;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
@Override
public String toString() {
return message;
}
}

19
spring-cloud/spring-cloud-stream/spring-cloud-stream-rabbit/src/main/java/com/baeldung/spring/cloud/stream/rabbit/processor/MyProcessor.java Normal file
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@ -0,0 +1,19 @@
package com.baeldung.spring.cloud.stream.rabbit.processor;
import org.springframework.cloud.stream.annotation.Input;
import org.springframework.cloud.stream.annotation.Output;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.SubscribableChannel;
public interface MyProcessor {
String INPUT = "myInput";
@Input
SubscribableChannel myInput();
@Output("myOutput")
MessageChannel anOutput();
@Output
MessageChannel anotherOutput();
}

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spring-cloud/spring-cloud-stream/spring-cloud-stream-rabbit/src/main/resources/application.yml Normal file
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@ -0,0 +1,28 @@
spring:
cloud:
stream:
bindings:
input:
destination: queue.log.messages
binder: local_rabbit
group: logMessageConsumers
output:
destination: queue.pretty.log.messages
binder: local_rabbit
binders:
local_rabbit:
type: rabbit
environment:
spring:
rabbitmq:
host: localhost
port: 5672
username: guest
password: guest
virtual-host: /
server:
port: 0
management:
health:
binders:
enabled: true

52
spring-cloud/spring-cloud-stream/spring-cloud-stream-rabbit/src/test/java/com/baeldung/spring/cloud/stream/rabbit/MultipleOutputsServiceApplicationTests.java Normal file
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@ -0,0 +1,52 @@
package com.baeldung.spring.cloud.stream.rabbit;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.stream.test.binder.MessageCollector;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.test.annotation.DirtiesContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.baeldung.spring.cloud.stream.rabbit.processor.MyProcessor;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = MultipleOutputsServiceApplication.class)
@DirtiesContext
public class MultipleOutputsServiceApplicationTests {
@Autowired
private MyProcessor pipe;
@Autowired
private MessageCollector messageCollector;
@Test
public void shouldReceiveMessageInAnOutput() {
whenSendMessage(1);
thenPayloadInChannelIs(pipe.anOutput(), 1);
}
@Test
public void shouldReceiveMessageInAnAnotherOutput() {
whenSendMessage(11);
thenPayloadInChannelIs(pipe.anotherOutput(), 11);
}
private void whenSendMessage(Integer val) {
pipe.myInput()
.send(MessageBuilder.withPayload(val)
.build());
}
private void thenPayloadInChannelIs(MessageChannel channel, Integer expectedValue) {
Object payload = messageCollector.forChannel(channel)
.poll()
.getPayload();
assertEquals(expectedValue, payload);
}
}

52
spring-cloud/spring-cloud-stream/spring-cloud-stream-rabbit/src/test/java/com/baeldung/spring/cloud/stream/rabbit/MultipleOutputsWithConditionsServiceApplicationTests.java Normal file
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@ -0,0 +1,52 @@
package com.baeldung.spring.cloud.stream.rabbit;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.stream.test.binder.MessageCollector;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.test.annotation.DirtiesContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.baeldung.spring.cloud.stream.rabbit.processor.MyProcessor;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = MultipleOutputsWithConditionsServiceApplication.class)
@DirtiesContext
public class MultipleOutputsWithConditionsServiceApplicationTests {
@Autowired
private MyProcessor pipe;
@Autowired
private MessageCollector messageCollector;
@Test
public void shouldReceiveMessageInAnOutput() {
whenSendMessage(1);
thenPayloadInChannelIs(pipe.anotherOutput(), 1);
}
@Test
public void shouldReceiveMessageInAnAnotherOutput() {
whenSendMessage(11);
thenPayloadInChannelIs(pipe.anotherOutput(), 11);
}
private void whenSendMessage(Integer val) {
pipe.myInput()
.send(MessageBuilder.withPayload(val)
.build());
}
private void thenPayloadInChannelIs(MessageChannel channel, Integer expectedValue) {
Object payload = messageCollector.forChannel(channel)
.poll()
.getPayload();
assertEquals(expectedValue, payload);
}
}

44
spring-cloud/spring-cloud-stream/spring-cloud-stream-rabbit/src/test/java/com/baeldung/spring/cloud/stream/rabbit/MyLoggerApplicationTests.java Normal file
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@ -0,0 +1,44 @@
package com.baeldung.spring.cloud.stream.rabbit;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.stream.messaging.Processor;
import org.springframework.cloud.stream.test.binder.MessageCollector;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.test.annotation.DirtiesContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.baeldung.spring.cloud.stream.rabbit.MyLoggerServiceApplication;
import com.baeldung.spring.cloud.stream.rabbit.model.LogMessage;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = MyLoggerServiceApplication.class)
@DirtiesContext
public class MyLoggerApplicationTests {
@Autowired
private Processor pipe;
@Autowired
private MessageCollector messageCollector;
@Test
public void shouldEnrichMessage() {
// Send message
pipe.input()
.send(MessageBuilder.withPayload(new LogMessage("This is my message"))
.build());
// Get response from the service
Object payload = messageCollector.forChannel(pipe.output())
.poll()
.getPayload();
// Assert
assertEquals("[1]: This is my message", payload.toString());
}
}