消息驱动的微服务SpringCloud Stream

素颜马尾好姑娘i 2022-04-22 01:28 267阅读 0赞

## 消息驱动的微服务SpringCloud Stream ##

### 文章目录 ###

*   *  消息驱动的微服务SpringCloud Stream
     *   *  快速入门
         *  消费组
         *  注入绑定接口
         *  注入消息通道

### 快速入门 ###

创建项目 stream-hello 9014

依赖文件

<?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.zk.springcloud</groupId>
        <artifactId>springcloud-stream</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>springcloud-stream</name>
        <description>Demo project for Spring Boot</description>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.6.RELEASE</version>
            <relativePath/> 
        </parent>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
            <spring-cloud.version>Finchley.SR1</spring-cloud.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-stream-rabbit</artifactId>
                <version>2.0.1.RELEASE</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-stream-test-support</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>
    
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>${spring-cloud.version}</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    </project>

创建用于接收来自 RabbitMQ 消息的消费者 SinkReceiver

@EnableBinding(Sink.class)
    public class SinkReceiver { 
    
        private static Logger logger = LoggerFactory.getLogger(SinkReceiver.class);
    
        @StreamListener(Sink.INPUT)
        public void receive(Object payload){ 
            logger.info("Received: " + payload);
        }
    
    }

启动类

@SpringBootApplication
    public class SpringcloudStreamApplication { 
    
        public static void main(String[] args) { 
            SpringApplication.run(SpringcloudStreamApplication.class, args);
        }
    }

配置文件

spring.application.name=stream-hello
    server.port=9014

启动 stream-hello 9014 ，可以获得以下信息，受用 guest 用户创建一个指向 127.0.0.1:5672 位置的 RabbitMQ 连接

o.s.a.r.c.CachingConnectionFactory       : Attempting to connect to: [localhost:5672]
    o.s.a.r.c.CachingConnectionFactory       : Created new connection: rabbitConnectionFactory#64bfd6fd:0/SimpleConnection@6ba7383d [delegate=amqp://guest@127.0.0.1:5672/, localPort= 43668]
    o.s.c.stream.binder.BinderErrorChannel   : Channel 'stream-hello.input.anonymous.GcXoim1vRbuMnvWsJOkaUg.errors' has 1 subscriber(s).
    o.s.c.stream.binder.BinderErrorChannel   : Channel 'stream-hello.input.anonymous.GcXoim1vRbuMnvWsJOkaUg.errors' has 2 subscriber(s).
    o.s.i.a.i.AmqpInboundChannelAdapter      : started inbound.input.anonymous.GcXoim1vRbuMnvWsJOkaUg

在 RabbitMQ 控制台可以看到 127.0.0.1:43668 rabbitConnectionFactory\#64bfd6fd:0 guest 的 connection 和 input.anonymous.GcXoim1vRbuMnvWsJOkaUg 名称的队列，并通过 RabbitMEssageChannelBinder 将自己绑定为它的消费者

在 input.anonymous.GcXoim1vRbuMnvWsJOkaUg 队列中，通过 Publish message 输入一条消息到该队列中，在控制台将接受到

c.z.s.springcloudstream.SinkReceiver     : Received: [B@79af2131

### 消费组 ###

spring.cloud.stream.bindings.inout.group=

### 注入绑定接口 ###

消息生成者，向 input 消息通道发送数据

创建一个将 Input 消息通道作为输出通道的接口

package com.zk.springcloud.springcloudstream;
    
    import org.springframework.cloud.stream.annotation.Output;
    import org.springframework.cloud.stream.messaging.Sink;
    import org.springframework.messaging.MessageChannel;
    
    public interface SinkSender { 
    
        @Output(Sink.INPUT)
        MessageChannel output();
    }

在 @EnableBinding 注解中增加对 SinkSender 接口的指定

package com.zk.springcloud.springcloudstream;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.cloud.stream.annotation.EnableBinding;
    import org.springframework.cloud.stream.annotation.StreamListener;
    import org.springframework.cloud.stream.messaging.Sink;
    
    @EnableBinding(value = { SinkSender.class})
    public class SinkReceiver { 
    
        private static Logger logger = LoggerFactory.getLogger(SinkReceiver.class);
    
        @StreamListener(Sink.INPUT)
        public void receive(Object payload){ 
            logger.info("Received: " + payload);
        }
    
    }

单元测试类

package com.zk.springcloud.springcloudstream;
    
    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.messaging.support.MessageBuilder;
    import org.springframework.test.context.junit4.SpringRunner;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class SpringcloudStreamApplicationTests { 
    
        @Autowired
        private SinkSender sinkSender;
    
        @Test
        public void contextLoads() { 
            sinkSender.output().send(MessageBuilder.withPayload("From, SinkSender").build());
        }
    
    }

运行单元测试，可以在控制台输出如下内容，消息被正确地发送到了 input 通道中，并被相对应的消息消费者输出

2018-10-25 13:56:39.026  INFO 13024 --- [           main] c.z.s.springcloudstream.SinkReceiver     : Received: From, SinkSender

### 注入消息通道 ###

通过以下代码，注入上面例子中 SinkSender 接口中定义的名为 input 的消息输入通道

package com.zk.springcloud.springcloudstream;
    
    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.messaging.MessageChannel;
    import org.springframework.messaging.support.MessageBuilder;
    import org.springframework.test.context.junit4.SpringRunner;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class SpringcloudStreamApplicationTests { 
    
        @Autowired
        private MessageChannel input;
    
        @Test
        public void contextLoads() { 
            input.send(MessageBuilder.withPayload("From, SinkSender").build());
        }
    
    }

完成了与之前通过注入绑定接口 SinkSender 方式实现的测试用例相同的操作