RabbitMQ学习笔记（下）：延迟队列，发布确认高级，备份交换机

十、延迟队列

延迟队列

概念：

延迟队列使用场景：

 

流程图：

延迟队列整合Springboot

导入依赖：

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
		<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>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.47</version>
		</dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
		</dependency>
		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger2</artifactId>
			<version>2.9.2</version>
		</dependency>
		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger-ui</artifactId>
			<version>2.9.2</version>
		</dependency>

		<dependency>
			<groupId>org.springframework.amqp</groupId>
			<artifactId>spring-rabbit-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

在java/com/atguigu/rabbitmq下创建config创建类SwaggerConfig，写入代码：

@Configuration
@EnableSwagger2
public class SwaggerConfig {
    @Bean
    public Docket webApiConfig(){
        return new Docket(DocumentationType.SWAGGER_2)
           .groupName("webApi")
           .apiInfo(webApiInfo())
           .select()
           .build();
    }
    private ApiInfo webApiInfo() {
        return new ApiInfoBuilder()
           .title("rabbitmq接口文档")
           .description("本文档描述了rabbitmq微服务接口定义")
           .version("1.0")
           .contact(new Contact("enjoy6288","http://atguigu.com","1551388580@qq.com"))
           .build();
    }
}

队列TTL代码框架图：

队列TTL（配置类代码）：

@Configuration
public class TtlQueueConfig {
    //普通交换机的名称
    public static final String X_EXCHANGE = "X";
    //死信交换机的名称
    public static final String Y_DEAD_LETTER_EXCHANGE = "Y";
    //普通队列的名称
    public static final String QUEUE_A = "QA";
    public static final String QUEUE_B = "QB";
    //死信队列的名称
    public static final String DEAD_LETTER_QUEUE = "QD";
    //声明xExchange
    @Bean("xExchange")
    public DirectExchange xExchange(){
        return new DirectExchange(X_EXCHANGE);
    }
    //声明yExchange
    @Bean("yExchange")
    public DirectExchange yExchange(){
        return new DirectExchange(Y_DEAD_LETTER_EXCHANGE);
    }
    //声明普通队列A的TTL为10s
    @Bean("queueA")
    public Queue queueA(){
        Map<String,Object> arguments = new HashMap<>(3);
        //设置死信交换机
        arguments.put("x-dead-letter-exchange",Y_DEAD_LETTER_EXCHANGE);
        //设置死信RoutingKey
        arguments.put("x-dead-letter-routing-key","YD");
        //设置TTL
        arguments.put("x-message-ttl",10000);
        return QueueBuilder.durable(QUEUE_A).withArguments(arguments).build();
    }
    //声明普通队列B的TTL为40s
    @Bean("queueB")
    public Queue queueB(){
        Map<String,Object> arguments = new HashMap<>(3);
        //设置死信交换机
        arguments.put("x-dead-letter-exchange",Y_DEAD_LETTER_EXCHANGE);
        //设置死信RoutingKey
        arguments.put("x-dead-letter-routing-key","YD");
        //设置TTL
        arguments.put("x-message-ttl",40000);
        return QueueBuilder.durable(QUEUE_B).withArguments(arguments).build();
    }
    //死信队列
    @Bean("queueD")
    public Queue queueD() {
        return QueueBuilder.durable(DEAD_LETTER_QUEUE).build();
    }
    //绑定A-X
    @Bean
    public Binding queueABindingX(@Qualifier("queueA") Queue queueA,
                                 @Qualifier("xExchange") DirectExchange xExchange){
        return BindingBuilder.bind(queueA).to(xExchange).with("XA");
    }
    //绑定B-x
    @Bean
    public Binding queueBBindingX(@Qualifier("queueB") Queue queueB,
                                 @Qualifier("xExchange") DirectExchange xExchange){
        return BindingBuilder.bind(queueB).to(xExchange).with("XB");
    }
    //绑定D-y
    @Bean
    public Binding queueDBindingY(@Qualifier("queueD") Queue queueD,