目前我已经开始使用ActiveMQ处理JMS主题。我通过JAVA代码(如下所示)创建了发布者和持久订阅者,并在订阅者端接收到了消息。
Publisher.Java
public static void createConnectionAndSendMessage(String ipAddress)
{
try
{
ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("tcp://"+ipAddress+":61617");
Connection connection = factory.createConnection();
connection.start();
Session topicSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
Topic topic = topicSession.createTopic("Test-Topic");
MessageProducer producer = topicSession.createProducer(topic);
producer.setDeliveryMode(DeliveryMode.PERSISTENT);
ObjectMessage message = topicSession.createObjectMessage();
TopicTO topicTO = new TopicTO();
topicTO.setId(i);
topicTO.setName("Sample");
message.setStringProperty("s_id", "Sample");
message.setObject((Serializable) topicTO);
producer.send(message);
System.out.println("message sent successfully");
}
}
catch(JMSException e)
{
System.out.println("error :" + e);
}
}
Subscriber.java
public void createConnectionAndReceiveMessage(String clientId, String ipAddress)
{
try
{
ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://"+ipAddress+":61617");
Connection connection = connectionFactory.createConnection();
connection.setClientID(clientId);
connection.start();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
Topic topic = session.createTopic("Test-Topic");
String selector = "s_id = 'Sample'";
System.out.println("selector : '"+selector+"'....");
TopicSubscriber consumer = session.createDurableSubscriber(topic, "Sub1", selector, true);
consumer.setMessageListener(new TopicMessageListener());
}
catch(Exception e)
{
System.out.println("error :" + e);
}
}
我有一些关于主题的疑问,具体如下:
如何使用Java JMS检查有多少订阅者在主题中积极地查找消息?
如何从主题中获取这些活动持久订阅者的列表?
我们有没有选项可以删除发布在主题上的消息?
请帮助我解决这些问题。
提前致谢。