ActiveMQ消息的延时和定时投递
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ActiveMQ对消息延时和定时投递做了很好的支持,其内部启动Scheduled来对该功能支持,也提供了一个封装的消息类型:org.apache.activemq.ScheduledMessage,只需要把几个描述消息定时调度方式的参数作为属性添加到消息,broker端的调度器就会按照我们想要的行为去处理消息。
Property name | type | description | AMQ_SCHEDULED_DELAYlong延迟投递的时间AMQ_SCHEDULED_PERIODlong重复投递的时间间隔AMQ_SCHEDULED_REPEATint重复投递次数AMQ_SCHEDULED_CRONStringCron表达式下面我们演示一下间隔性重复投递;生产者:
- 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);
-
- Connection connection = factory.createConnection();
-
- connection.start();
-
- Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
-
- Destination destination = session.createQueue(queue_name);
-
- MessageProducer producer = session.createProducer(destination);
-
- producer.setDeliveryMode(DeliveryMode.PERSISTENT);
- TextMessage message = session.createTextMessage("test delay message:" + System.currentTimeMillis());
- long time = 60 * 1000;
- long period = 10 * 1000;
- int repeat = 6;
- message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, time);
- message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_PERIOD, period);
- message.setIntProperty(ScheduledMessage.AMQ_SCHEDULED_REPEAT, repeat);
-
- producer.send(message);
- session.commit();
- producer.close();
- session.close();
- connection.close();
- }
- }
消费者代码:- 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);
-
- Connection connection = factory.createConnection();
-
- connection.start();
-
- Session session = connection.createSession(Boolean.TRUE, Session.CLIENT_ACKNOWLEDGE);
-
- Destination destination = session.createQueue(queue_name);
-
- 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();
- }
- }