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_DELAY long 延迟投递的时间 AMQ_SCHEDULED_PERIOD long 重复投递的时间间隔 AMQ_SCHEDULED_REPEAT int 重复投递次数 AMQ_SCHEDULED_CRON String Cron表达式 生产者:
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748package
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 {
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);
// 通过工厂创建一个连接
Connection connection = factory.createConnection();
// 启动连接
connection.start();
// 创建一个session会话 事务 自动ack
Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
// 创建一个消息队列
Destination destination = session.createQueue(queue_name);
// 创建生产者
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
;
// 延时1min
long
period =
10
*
1000
;
// 每个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);
// 发送消息
producer.send(message);
session.commit();
producer.close();
session.close();
connection.close();
}
}
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748package
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 {
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);
// 通过工厂创建一个连接
Connection connection = factory.createConnection();
// 启动连接
connection.start();
// 创建一个session会话 事务 自动ack
Session session = connection.createSession(Boolean.TRUE, Session.CLIENT_ACKNOWLEDGE);
// 创建一个消息队列
Destination destination = session.createQueue(queue_name);
// 创建消费者
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();
}
}