1.Fanout Exchange介紹
Fanout Exchange 消息廣播的模式,不管路由鍵或者是路由模式,會把消息發給綁定給它的全部隊列,如果配置了routing_key會被忽略。
如上圖所示,即當使用fanout交換器時,他會將消息廣播到與該交換器綁定的所有隊列上,這有利於你對單條消息做不同的反應。
例如存在以下場景:一個web服務要在用戶完善信息時,獲得積分獎勵,這樣你就可以創建兩個對列,一個用來處理用戶信息的請求,另一個對列獲取這條消息是來完成積分獎勵的任務。
2.代碼示例
1).Queue配置類
FanoutRabbitConfig.java類:
package com.example.rabbitmqfanout;
import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.FanoutExchange;
import org.springframework.amqp.core.Queue;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class FanoutRabbitConfig {
//創建隊列
@Bean
public Queue AMessage() {
return new Queue("fanout.A");
}
//創建隊列
@Bean
public Queue BMessage() {
return new Queue("fanout.B");
}
//創建隊列
@Bean
public Queue CMessage() {
return new Queue("fanout.C");
}
//創建Fanout交換器
@Bean
FanoutExchange fanoutExchange() {
return new FanoutExchange("fanoutExchange");
}
//將對列綁定到Fanout交換器
@Bean
Binding bindingExchangeA(Queue AMessage,FanoutExchange fanoutExchange) {
return BindingBuilder.bind(AMessage).to(fanoutExchange);
}
//將對列綁定到Fanout交換器
@Bean
Binding bindingExchangeB(Queue BMessage, FanoutExchange fanoutExchange) {
return BindingBuilder.bind(BMessage).to(fanoutExchange);
}
//將對列綁定到Fanout交換器
@Bean
Binding bindingExchangeC(Queue CMessage, FanoutExchange fanoutExchange) {
return BindingBuilder.bind(CMessage).to(fanoutExchange);
}
}
2).消息生產者
FanoutSender.java類:
package com.example.rabbitmqfanout.rabbitmq;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class FanoutSender {
@Autowired
private AmqpTemplate rabbitTemplate;
public void send() {
String context = "hi, fanout msg ";
System.out.println("Sender : " + context);
this.rabbitTemplate.convertAndSend("fanoutExchange","", context);
}
}
3).消息消費者
FanoutReceiverA.java類:
package com.example.rabbitmqfanout.rabbitmq;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
@RabbitListener(queues = "fanout.A")
public class FanoutReceiverA {
@RabbitHandler
public void process(String message) {
System.out.println("fanout Receiver A : " + message);
}
}
FanoutReceiverB.java類:
package com.example.rabbitmqfanout.rabbitmq;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
@RabbitListener(queues = "fanout.B")
public class FanoutReceiverB {
@RabbitHandler
public void process(String message) {
System.out.println("fanout Receiver B: " + message);
}
}
FanoutReceiverC.java類:
package com.example.rabbitmqfanout.rabbitmq;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
@RabbitListener(queues = "fanout.C")
public class FanoutReceiverC {
@RabbitHandler
public void process(String message) {
System.out.println("fanout Receiver C: " + message);
}
}
4).測試
FanoutTest.java類:
package com.example.rabbitmqfanout.rabbitmq;
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.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
public class FanoutTest {
@Autowired
private FanoutSender sender;
@Test
public void fanoutSender() throws Exception {
sender.send();
}
}