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使用延迟消息实现定时任务（RabbitMQ）
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‎4-Finchley/pom.xml‎

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<!-- @StreamListener根据内容路由 -->
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<module>stream-content-route</module>
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<!-- 使用延迟消息实现定时任务（RabbitMQ）-->
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<module>stream-delayed-message</module>
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</modules>
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</project>

‎4-Finchley/stream-delayed-message/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.didispace</groupId>
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<artifactId>stream-delayed-message</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<packaging>jar</packaging>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.0.5.RELEASE</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>1.18.2</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-starter-stream-rabbit</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-actuator</artifactId>
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</dependency>
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</dependencies>
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<dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-dependencies</artifactId>
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<version>Finchley.SR1</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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</dependencies>
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</dependencyManagement>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎4-Finchley/stream-delayed-message/src/main/java/com/didispace/stream/TestApplication.java‎

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package com.didispace.stream;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.cloud.stream.annotation.EnableBinding;
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import org.springframework.cloud.stream.annotation.Input;
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import org.springframework.cloud.stream.annotation.Output;
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import org.springframework.cloud.stream.annotation.StreamListener;
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import org.springframework.integration.support.MessageBuilder;
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import org.springframework.messaging.MessageChannel;
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import org.springframework.messaging.SubscribableChannel;
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import org.springframework.stereotype.Component;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestParam;
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import org.springframework.web.bind.annotation.RestController;
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@EnableBinding(TestApplication.TestTopic.class)
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@SpringBootApplication
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public class TestApplication {
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public static void main(String[] args) {
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SpringApplication.run(TestApplication.class, args);
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}
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@Slf4j
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@RestController
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static class TestController {
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@Autowired
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private TestTopic testTopic;
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/**
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* 消息生产接口
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*
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* @param message
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* @return
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*/
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@GetMapping("/sendMessage")
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public String messageWithMQ(@RequestParam String message) {
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log.info("Send: " + message);
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testTopic.output().send(MessageBuilder.withPayload(message).setHeader("x-delay", 5000).build());
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return "ok";
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}
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}
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/**
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* 消息消费逻辑
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*/
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@Slf4j
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@Component
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static class TestListener {
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@StreamListener(TestTopic.INPUT)
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public void receive(String payload) {
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log.info("Received: " + payload);
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}
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}
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interface TestTopic {
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String OUTPUT = "example-topic-output";
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String INPUT = "example-topic-input";
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@Output(OUTPUT)
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MessageChannel output();
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@Input(INPUT)
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SubscribableChannel input();
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}
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}

‎4-Finchley/stream-delayed-message/src/main/resources/application.properties‎

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spring.application.name=stream-delayed-message
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server.port=8080
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spring.cloud.stream.bindings.example-topic-input.destination=delay-topic
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spring.cloud.stream.bindings.example-topic-input.group=test
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spring.cloud.stream.rabbit.bindings.example-topic-input.consumer.delayed-exchange=true
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spring.cloud.stream.bindings.example-topic-output.destination=delay-topic
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spring.cloud.stream.rabbit.bindings.example-topic-output.producer.delayed-exchange=true

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