【RabbitMQ】02 工作佇列模式

阿新 • • 發佈：2021-10-07

首先編寫一個工作佇列的生產者：

傳送10條訊息然後就關閉，10條訊息讓RabbitMQ先存著

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

import java.nio.charset.StandardCharsets;

public class WorkQueueInProducer {

    /**
     * 工作佇列
     * @param args
     */
    public 
 static void main(String[] args) throws Exception {
        ConnectionFactory connectionFactory = new ConnectionFactory();

        connectionFactory.setHost("192.168.2.121");
        connectionFactory.setPort(ConnectionFactory.DEFAULT_AMQP_PORT); // 5672
        connectionFactory.setVirtualHost("/dzz"); // 
 虛擬主機？ 預設值 /
        connectionFactory.setUsername("test"); // guest
        connectionFactory.setPassword("123456"); // guest

        Connection connection = connectionFactory.newConnection();
        Channel channel = connection.createChannel();
        channel.queueDeclare("work_queue", true, false, false 
, null);

        for (int i = 0; i < 10; i++) {
            String body = "send workQueue msg" + i;
            channel.basicPublish("", "work_queue", null, body.getBytes(StandardCharsets.UTF_8));
        }

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

然後建立兩個消費者：

兩個消費者的程式碼是一樣的，就是接收訊息列印即可

但是不要關閉

package cn.dzz.workQueue;

import com.rabbitmq.client.*;

import java.io.IOException;
import java.nio.charset.StandardCharsets;

public class WorkQueueInConsumer2 {

    /**
     * 工作佇列 消費者
     * @param args
     */
    public static void main(String[] args) throws Exception{
        ConnectionFactory connectionFactory = new ConnectionFactory();

        connectionFactory.setHost("192.168.2.121");
        connectionFactory.setPort(ConnectionFactory.DEFAULT_AMQP_PORT); // 5672
        connectionFactory.setVirtualHost("/dzz"); // 虛擬主機？ 預設值 /
        connectionFactory.setUsername("test"); // guest
        connectionFactory.setPassword("123456"); // guest

        Connection connection = connectionFactory.newConnection();
        Channel channel = connection.createChannel();
        channel.queueDeclare("work_queue", true, false, false, null);

        Consumer consumer = new DefaultConsumer(channel) {
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
                System.out.println("body(message) " + new String(body, StandardCharsets.UTF_8));
                System.out.println("- - - - - over - - - - -");
            }
        };

        channel.basicConsume("work_queue", true, consumer);
    }
}

先開啟兩個消費者：

然後再執行生產者傳送訊息：

RabbitMQ立即把生產者的訊息分配過來給兩個消費者：

消費者1輸出

"C:\Program Files (x86)\Java\jdk1.8.0_291\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2021.2.1\lib\idea_rt.jar=50684:C:\Program Files\JetBrains\IntelliJ IDEA 2021.2.1\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\charsets.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\deploy.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\access-bridge-32.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\cldrdata.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\dnsns.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\jaccess.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\jfxrt.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\localedata.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\nashorn.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\sunec.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\sunjce_provider.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\sunmscapi.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\sunpkcs11.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\zipfs.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\javaws.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\jce.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\jfr.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\jfxswt.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\jsse.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\management-agent.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\plugin.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\resources.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\rt.jar;C:\Users\Administrator\IdeaProjects\RabbitMQ\ConsumerService\target\classes;C:\Users\Administrator\.m2\repository\com\rabbitmq\amqp-client\5.6.0\amqp-client-5.6.0.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar" cn.dzz.workQueue.WorkQueueInConsumer1
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
body(message) send workQueue msg0
- - - - - over - - - - -
body(message) send workQueue msg2
- - - - - over - - - - -
body(message) send workQueue msg4
- - - - - over - - - - -
body(message) send workQueue msg6
- - - - - over - - - - -
body(message) send workQueue msg8
- - - - - over - - - - -

消費者2輸出：

"C:\Program Files (x86)\Java\jdk1.8.0_291\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2021.2.1\lib\idea_rt.jar=50693:C:\Program Files\JetBrains\IntelliJ IDEA 2021.2.1\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\charsets.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\deploy.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\access-bridge-32.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\cldrdata.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\dnsns.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\jaccess.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\jfxrt.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\localedata.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\nashorn.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\sunec.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\sunjce_provider.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\sunmscapi.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\sunpkcs11.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\ext\zipfs.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\javaws.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\jce.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\jfr.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\jfxswt.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\jsse.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\management-agent.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\plugin.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\resources.jar;C:\Program Files (x86)\Java\jdk1.8.0_291\jre\lib\rt.jar;C:\Users\Administrator\IdeaProjects\RabbitMQ\ConsumerService\target\classes;C:\Users\Administrator\.m2\repository\com\rabbitmq\amqp-client\5.6.0\amqp-client-5.6.0.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar" cn.dzz.workQueue.WorkQueueInConsumer2
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
body(message) send workQueue msg1
- - - - - over - - - - -
body(message) send workQueue msg3
- - - - - over - - - - -
body(message) send workQueue msg5
- - - - - over - - - - -
body(message) send workQueue msg7
- - - - - over - - - - -
body(message) send workQueue msg9
- - - - - over - - - - -

主要的作用是為了分攤這個10個訊息

消費者之間是處於競爭關係，爭奪訊息的接收

工作佇列用於任務過重的場景，用來提高任務處理速度