ActiveMQ消息的延時和定時投遞

ActiveMQ對消息延時和定時投遞做了很好的支持，其內部啓動Scheduled來對該功能支持，也提供了一個封裝的消息類型：org.apache.activemq.ScheduledMessage，只需要把幾個描述消息定時調度方式的參數作爲屬性添加到消息，broker端的調度器就會按照我們想要的行爲去處理消息。

Property name	type	description
AMQ_SCHEDULED_DELAY	long	延遲投遞的時間
AMQ_SCHEDULED_PERIOD	long	重複投遞的時間間隔
AMQ_SCHEDULED_REPEAT	int	重複投遞次數
AMQ_SCHEDULED_CRON	String	Cron表達式

下面我們演示一下間隔性重複投遞；

生產者：

package cn.slimsmart.study.activemq;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.DeliveryMode;
import javax.jms.Destination;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.ScheduledMessage;

public class Producer {

	public static final String broker_url = "failover:(tcp://10.1.199.169:61616)";
	private static String queue_name = "test.queue";

	public static void main(String[] args) throws Exception {
		ConnectionFactory factory = new ActiveMQConnectionFactory(ActiveMQConnection.DEFAULT_USER, ActiveMQConnection.DEFAULT_PASSWORD, broker_url);
		// 通過工廠創建一個連接
		Connection connection = factory.createConnection();
		// 啓動連接
		connection.start();
		// 創建一個session會話 事務 自動ack
		Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
		// 創建一個消息隊列
		Destination destination = session.createQueue(queue_name);
		// 創建生產者
		MessageProducer producer = session.createProducer(destination);
		// 消息持久化
		producer.setDeliveryMode(DeliveryMode.PERSISTENT);
		TextMessage message = session.createTextMessage("test delay message:" + System.currentTimeMillis());
		long time = 60 * 1000;// 延時1min
		long period = 10 * 1000;// 每個10s
		int repeat = 6;// 6次
		message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, time);
		message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_PERIOD, period);
		message.setIntProperty(ScheduledMessage.AMQ_SCHEDULED_REPEAT, repeat);
		// 發送消息
		producer.send(message);
		session.commit();
		producer.close();
		session.close();
		connection.close();
	}
}

消費者代碼：

package cn.slimsmart.study.activemq;

import java.util.concurrent.CountDownLatch;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;

public class Consumer {

	public static final String broker_url = "failover:(tcp://10.1.199.169:61616)";
	private static String queue_name = "test.queue";

	public static void main(String[] args) throws Exception {
		ConnectionFactory factory = new ActiveMQConnectionFactory(ActiveMQConnection.DEFAULT_USER, ActiveMQConnection.DEFAULT_PASSWORD, broker_url);
		// 通過工廠創建一個連接
		Connection connection = factory.createConnection();
		// 啓動連接
		connection.start();
		// 創建一個session會話 事務 自動ack
		Session session = connection.createSession(Boolean.TRUE, Session.CLIENT_ACKNOWLEDGE);
		// 創建一個消息隊列
		Destination destination = session.createQueue(queue_name);
		// 創建消費者
		MessageConsumer consumer = session.createConsumer(destination);
		consumer.setMessageListener(new MessageListener() {
			@Override
			public void onMessage(Message message) {
				try {
					System.out.println("receive message ：" + ((TextMessage) message).getText());
					message.acknowledge();
				} catch (JMSException e) {
					e.printStackTrace();
				}
			}
		});
		new CountDownLatch(1).await();
	}
}

參考：

1.延時和定時消息投遞

2.消息屬性定義