查看JMS队列并获取其中的所有消息的最佳方法是什么?
如何计算队列中的消息数?
感谢。
答案 0 :(得分:12)
使用JmsTemplate
public int getMessageCount(String messageSelector)
{
return jmsTemplate.browseSelected(messageSelector, new BrowserCallback<Integer>() {
@Override
public Integer doInJms(Session s, QueueBrowser qb) throws JMSException
{
return Collections.list(qb.getEnumeration()).size();
}
});
}
答案 1 :(得分:6)
这是计算队列中的消息数
的方法public static void main(String[] args) throws Exception
{
// get the initial context
InitialContext ctx = new InitialContext();
// lookup the queue object
Queue queue = (Queue) ctx.lookup("queue/queue0");
// lookup the queue connection factory
QueueConnectionFactory connFactory = (QueueConnectionFactory) ctx.
lookup("queue/connectionFactory");
// create a queue connection
QueueConnection queueConn = connFactory.createQueueConnection();
// create a queue session
QueueSession queueSession = queueConn.createQueueSession(false,
Session.AUTO_ACKNOWLEDGE);
// create a queue browser
QueueBrowser queueBrowser = queueSession.createBrowser(queue);
// start the connection
queueConn.start();
// browse the messages
Enumeration e = queueBrowser.getEnumeration();
int numMsgs = 0;
// count number of messages
while (e.hasMoreElements()) {
Message message = (Message) e.nextElement();
numMsgs++;
}
System.out.println(queue + " has " + numMsgs + " messages");
// close the queue connection
queueConn.close();
}
答案 2 :(得分:5)
Java 8和Spring Boot
public int countPendingMessages(String destination) {
// to an Integer because the response of .browse may be null
Integer totalPendingMessages = this.jmsTemplate.browse(destination, (session, browser) -> Collections.list(browser.getEnumeration()).size());
return totalPendingMessages == null ? 0 : totalPendingMessages;
}