rabbitmq学习5:Topics

在前面的《rabbitmq学习4:Routing 》中使用一般的名字的路由，现在想通过一些路由规则让消费者来接受符合规则的消息？那应当怎么样呢？那就要用到类型为topic的Exchange了。

Topics的工作示意图如下：

我们可能从图中看到有*和#两个通配符。*表示通配一个词；#表示通配0个或多个词。

下面让我们来看看Topics的程序如何实现的吧!

P端的程序如下 ：

 

package com.abin.rabbitmq;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

public class EmitLogTopic {
    private static final String EXCHANGE_NAME = "topic_logs";

    public static void main(String[] argv) throws Exception {

        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME, "topic");//声明topic类型的Exchange

        String routingKeyOne = "logs.error.one";// 定义一个路由名为“error”
        for (int i = 0; i <= 1; i++) {
            String messageOne = "this is one error logs:" + i;
            channel.basicPublish(EXCHANGE_NAME, routingKeyOne, null, messageOne
                    .getBytes());
            System.out.println(" [x] Sent '" + routingKeyOne + "':'"
                    + messageOne + "'");
        }

        System.out.println("################################");
        String routingKeyTwo = "logs.error.two";
        for (int i = 0; i <= 2; i++) {
            String messageTwo = "this is two error logs:" + i;
            channel.basicPublish(EXCHANGE_NAME, routingKeyTwo, null, messageTwo
                    .getBytes());
            System.out.println(" [x] Sent '" + routingKeyTwo + "':'"
                    + messageTwo + "'");
        }

        System.out.println("################################");
        String routingKeyThree = "logs.info.one";
        for (int i = 0; i <= 3; i++) {
            String messageThree = "this is one info logs:" + i;
            channel.basicPublish(EXCHANGE_NAME, routingKeyThree, null,
                    messageThree.getBytes());
            System.out.println(" [x] Sent '" + routingKeyThree + "':'"
                    + messageThree + "'");
        }

        channel.close();
        connection.close();
    }
}

 

运行结果可能如下：

 [x] Sent 'logs.error.one':'this is one error logs:0'
 [x] Sent 'logs.error.one':'this is one error logs:1'
################################
 [x] Sent 'logs.error.two':'this is two error logs:0'
 [x] Sent 'logs.error.two':'this is two error logs:1'
 [x] Sent 'logs.error.two':'this is two error logs:2'
################################
 [x] Sent 'logs.info.one':'this is one info logs:0'
 [x] Sent 'logs.info.one':'this is one info logs:1'
 [x] Sent 'logs.info.one':'this is one info logs:2'
 [x] Sent 'logs.info.one':'this is one info logs:3'

 

第一个C端的代码如下：

package com.abin.rabbitmq;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.QueueingConsumer;

public class ReceiveLogsTopic {
    private static final String EXCHANGE_NAME = "topic_logs";// 定义Exchange名称

    public static void main(String[] argv) throws Exception {

        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME, "topic");// 声明topic类型的Exchange

        String queueName = "queue_topic_logs1";// 定义队列名为“queue_topic_logs1”的Queue
        channel.queueDeclare(queueName, false, false, false, null);
//      String routingKeyOne = "*.error.two";// "error"路由规则
//      channel.queueBind(queueName, EXCHANGE_NAME, routingKeyOne);// 把Queue、Exchange及路由绑定
        String routingKeyTwo = "logs.*.one";//通配所有logs下第三词（最后一个）词为one的消息
        channel.queueBind(queueName, EXCHANGE_NAME, routingKeyTwo);

        System.out.println(" [*] Waiting for messages.");

        QueueingConsumer consumer = new QueueingConsumer(channel);
        channel.basicConsume(queueName, true, consumer);

        while (true) {
            QueueingConsumer.Delivery delivery = consumer.nextDelivery();
            String message = new String(delivery.getBody());
            String routingKey = delivery.getEnvelope().getRoutingKey();

            System.out.println(" [x] Received '" + routingKey + "':'" + message
                    + "'");
        }
    }
}

 

第一个C端的运行结果如下：

[*] Waiting for messages.
[x] Received 'logs.error.one':'this is one error logs:0'
[x] Received 'logs.error.one':'this is one error logs:1'
[x] Received 'logs.info.one':'this is one info logs:0'
[x] Received 'logs.info.one':'this is one info logs:1'
[x] Received 'logs.info.one':'this is one info logs:2'
[x] Received 'logs.info.one':'this is one info logs:3'

 

第二个C端的程序如下： 

package com.abin.rabbitmq;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.QueueingConsumer;

public class ReceiveLogsTopicTwo {
    private static final String EXCHANGE_NAME = "topic_logs";//定义Exchange名称

    public static void main(String[] argv) throws Exception {

        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME, "topic");//声明topic类型的Exchange

        String queueName = "queue_topic_logs2";//定义队列名为“queue_topic_logs2”的Queue
        channel.queueDeclare(queueName, false, false, false, null);
        String routingKeyOne = "logs.#";//通配所有logs下的消息
        channel.queueBind(queueName, EXCHANGE_NAME, routingKeyOne);//把Queue、Exchange及路由绑定

        System.out.println(" [*] Waiting for messages.");

        QueueingConsumer consumer = new QueueingConsumer(channel);
        channel.basicConsume(queueName, true, consumer);

        while (true) {
            QueueingConsumer.Delivery delivery = consumer.nextDelivery();
            String message = new String(delivery.getBody());
            String routingKey = delivery.getEnvelope().getRoutingKey();

            System.out.println(" [x] Received '" + routingKey + "':'" + message
                    + "'");
        }
    }
}

 

第二个C端的运行结果如下：

[*] Waiting for messages.
[x] Received 'logs.error.one':'this is one error logs:0'
[x] Received 'logs.error.one':'this is one error logs:1'
[x] Received 'logs.error.two':'this is two error logs:0'
[x] Received 'logs.error.two':'this is two error logs:1'
[x] Received 'logs.error.two':'this is two error logs:2'
[x] Received 'logs.info.one':'this is one info logs:0'
[x] Received 'logs.info.one':'this is one info logs:1'
[x] Received 'logs.info.one':'this is one info logs:2'
[x] Received 'logs.info.one':'this is one info logs:3'

 

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