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From "Denis Abramov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQ-1600) Number of items in Topic queue never empties out (Queue Size in JMX for every topic seems to be > 0 all the time)
Date Wed, 09 Jul 2008 21:08:00 GMT

    [ https://issues.apache.org/activemq/browse/AMQ-1600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=44129#action_44129
] 

Denis Abramov commented on AMQ-1600:
------------------------------------

Not really doing anything fancy to have this issue happen... just calling send many times:
persistent = false and looking at JConsole... 

/*********************************************************************
	 * Create a connection to the messaging system
	 * 
	 * @param jms_url
	 * @param intf
	 * @param is_durable_subscriber
	 * @throws Exception
	 *********************************************************************/
	public void createConnection(String jms_url, MessageManagerIntf intf, boolean is_durable_subscriber)
throws Exception {
		_jms_url = jms_url;
		_is_durable_subscriber = is_durable_subscriber;
		_msg_wrapper_intf = intf;
		
		log.info("");
		log.info("");
		log.info("Creating Connection to: " + jms_url);
		log.info("");
		String user = ActiveMQConnection.DEFAULT_USER;
		String password = ActiveMQConnection.DEFAULT_PASSWORD;
		
		//jms_url = addJMSOptions(jms_url);
		ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(user, password,
jms_url);
		connectionFactory.setDispatchAsync(true);
		connectionFactory.setUseAsyncSend(true);
		
		_connection = connectionFactory.createConnection();
		_connection.setExceptionListener(this);
		
		if (is_durable_subscriber)
			_connection.setClientID(_msg_wrapper_intf.getClass().getSimpleName());
		else {
			SimpleDateFormat f = new SimpleDateFormat("M/d/yyyy h_mm_ss a");
			Calendar cal = Calendar.getInstance();
			_connection.setClientID(_msg_wrapper_intf.getClass().getSimpleName().toLowerCase() + "@"
+  InetAddress.getLocalHost().getHostName().toUpperCase() + "-" + f.format(cal.getTime())
+ "--" + cal.getTimeInMillis());
		}
		
		log.info("JMS VERSION: " + _connection.getMetaData().getJMSVersion());
		log.info("JMS PROVIDER: " + _connection.getMetaData().getJMSProviderName());
		log.info("JMS PROVIDER VERSION: " + _connection.getMetaData().getProviderVersion());
		log.info("CLIENT ID: " + _connection.getClientID());
		
		_connection.start();
		_session = _connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
	}
	

public void send(String name, DESTINATION_TYPE destination_type, Destination reply_to, MessageIntf
wrapper, boolean persistent) throws Exception { 
                Destination dest = createDestination(name, destination_type); 
                MessageProducer publisher = getProducer(dest, persistent); 
                          
                          //wrapper.generateXMLMessage() just generates some XML message.

                TextMessage msg = _session.createTextMessage(wrapper.generateXMLMessage());

                msg.setJMSReplyTo(reply_to); 
                log.debug(this.getClass().getName() + ">>>>>> SENDING MESSAGE
TO '" + dest + "': " + wrapper.generateXMLMessage()); 
                publisher.send(msg); 
} 




        public MessageProducer getProducer(Destination dest, boolean persistent) throws Exception
{ 
                //just a little optimization so I don't have too many producing running amock.
Have 1 producer per destination 

                         if (_producer_cache.containsKey(dest.toString())) 
                        return _producer_cache.get(dest.toString()); 
                
                MessageProducer publisher = _session.createProducer(dest); 
                if(persistent) 
                        publisher.setDeliveryMode(DeliveryMode.PERSISTENT); 
                else 
                        publisher.setDeliveryMode(DeliveryMode.NON_PERSISTENT); 
                
                _producer_cache.put(dest.toString(), publisher); 
                return publisher; 
        } 


/******************************************************************** 
         * Create a topic 
         * @param name 
         * @return 
         * @throws JMSException 
         * 
         *******************************************************************/ 
        public Destination createDestination(String name, DESTINATION_TYPE destination) throws
JMSException { 
                switch (destination) { 
                case TOPIC: 
                        return _session.createTopic(name); 
                case QUEUE: 
                        return _session.createQueue(name); 
                default: 
                        return null; 
                } 
        } 


> Number of items in Topic queue never empties out (Queue Size in JMX for every topic seems
to be > 0 all the time)
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-1600
>                 URL: https://issues.apache.org/activemq/browse/AMQ-1600
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.1.0
>         Environment: Linux
>            Reporter: Denis Abramov
>            Assignee: Rob Davies
>            Priority: Critical
>         Attachments: untitled.JPG
>
>
> If I create a topic and then have a producer write to the topic (non-persistent message)
the items in the queueSize in JMX appears to be the total messages that I sent. Even if I
start the consumer the number of items on the queue never goes down. If I run the same code
in 4.1.0 the queue size is always 0 which is the expected behavior -- something changed in
5.1... Will try on 5.0 in a few minutes.

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