3.rabbitmq Work Queues
【摘要】 前言
本文介绍java客户端如何实现工作队列，入下图所示，生产者P生产消息，消息传送到队列，C1,C2轮流消费消息。
image.png
代码
build.gradle
plugins { id 'java'
}
group 'com.nick'
version '1.0-SNAPSHOT'
sourceCompatibility = 1.8
reposi...
前言
本文介绍java客户端如何实现工作队列，入下图所示，生产者P生产消息，消息传送到队列，C1,C2轮流消费消息。
image.png
代码
- build.gradle
plugins { id 'java'
}
group 'com.nick'
version '1.0-SNAPSHOT'
sourceCompatibility = 1.8
repositories { mavenCentral()
}
dependencies { testCompile group: 'junit', name: 'junit', version: '4.12' compile group: 'com.rabbitmq', name: 'amqp-client', version: '5.2.0' compile group: 'org.slf4j', name: 'slf4j-api', version: '1.7.25' compile group: 'org.slf4j', name: 'slf4j-simple', version: '1.7.25' compile group: 'org.projectlombok', name: 'lombok', version: '1.18.0'
}
- send.java
package com.nick.workQueues;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.MessageProperties;
import java.util.concurrent.TimeoutException;
public class Send { private static final String TASK_QUEUE_NAME = "task_queue"; public static void main(String[] argv) throws java.io.IOException, TimeoutException { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("192.168.5.136"); Connection connection = factory.newConnection(); Channel channel = connection.createChannel(); channel.queueDeclare(TASK_QUEUE_NAME, true, false, false, null); String message = "hello work queues"; channel.basicPublish( "", TASK_QUEUE_NAME, MessageProperties.PERSISTENT_TEXT_PLAIN, message.getBytes()); System.out.println(" [x] Sent '" + message + "'"); channel.close(); connection.close(); }
}
- Rev1.java
package com.nick.workQueues;
import com.rabbitmq.client.*;
import java.io.IOException;
public class Rev1 { private static final String TASK_QUEUE_NAME = "task_queue"; public static void main(String[] argv) throws Exception { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("192.168.5.136"); final Connection connection = factory.newConnection(); final Channel channel = connection.createChannel(); channel.queueDeclare(TASK_QUEUE_NAME, true, false, false, null); System.out.println(" [*] Waiting for messages. To exit press CTRL+C"); channel.basicQos(1); final Consumer consumer = new DefaultConsumer(channel) { @Override public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException { String message = new String(body, "UTF-8"); System.out.println(" 1.Received:[x] '" + message + "'"); try { doWork(message); } finally { System.out.println(" [x] Done"); channel.basicAck(envelope.getDeliveryTag(), false); } } }; boolean autoAck = false; channel.basicConsume(TASK_QUEUE_NAME, autoAck, consumer); } private static void doWork(String task) { for (char ch : task.toCharArray()) { if (ch == '.') { try { Thread.sleep(1000); } catch (InterruptedException _ignored) { Thread.currentThread().interrupt(); } } } }
}
- Rev2
package com.nick.workQueues;
import com.rabbitmq.client.*;
import java.io.IOException;
public class Rev2 { private static final String TASK_QUEUE_NAME = "task_queue"; public static void main(String[] argv) throws Exception { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("192.168.5.136"); final Connection connection = factory.newConnection(); final Channel channel = connection.createChannel(); channel.queueDeclare(TASK_QUEUE_NAME, true, false, false, null); System.out.println(" [*] Waiting for messages. To exit press CTRL+C"); channel.basicQos(1); final Consumer consumer = new DefaultConsumer(channel) { @Override public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException { String message = new String(body, "UTF-8"); System.out.println(" 2.Received:[x] '" + message + "'"); try { doWork(message); } finally { System.out.println(" [x] Done"); channel.basicAck(envelope.getDeliveryTag(), false); } } }; boolean autoAck = false; channel.basicConsume(TASK_QUEUE_NAME, autoAck, consumer); } private static void doWork(String task) { for (char ch : task.toCharArray()) { if (ch == '.') { try { Thread.sleep(1000); } catch (InterruptedException _ignored) { Thread.currentThread().interrupt(); } } } }
}
测试
- 执行Rev1.java
- 执行Rev2.java
- 多次执行执行Send.java，可以看到控制台对应的输出，可以看到接收窗口2个接收进程轮流接收数据；
image.png
image.png
详细代码见
https://github.com/qiujiahong/rabbitmq_study
文章来源: www.jianshu.com，作者：Nick_4438，版权归原作者所有，如需转载，请联系作者。
原文链接：www.jianshu.com/p/1f1b9a766d7f
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