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Date: Wed, 17 Sep 2008 01:37:52 -0700 (PDT)
From: "Bruce Snyder (JIRA)" <jira@apache.org>
To: dev@activemq.apache.org
Subject: [jira] Commented: (AMQ-1940) Negative queue size (reproducible)
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    [ https://issues.apache.org/activemq/browse/AMQ-1940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=45756#action_45756 ] 

Bruce Snyder commented on AMQ-1940:
-----------------------------------

I've created the following test case out of the attached {{Main.java}} class: 

{code}
package org.apache.activemq.broker.region;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.management.MBeanServerInvocationHandler;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;

import junit.framework.TestCase;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.jmx.QueueViewMBean;

public class QueuePurgeTest extends TestCase {
    
    BrokerService broker; 
    ConnectionFactory factory; 
    Connection connection;
    Session session;
    Queue queue;
    MessageConsumer consumer;

    protected void setUp() throws Exception {
        broker = new BrokerService();
        broker.setUseJmx(true);
        broker.setPersistent(false);
        broker.addConnector("tcp://localhost:0");
        broker.start();
        
        factory = new ActiveMQConnectionFactory("vm://localhost");
        
        connection = factory.createConnection();
        connection.start();
    }

    protected void tearDown() throws Exception {
        consumer.close();
        session.close();
        connection.stop();
        connection.close();
        broker.stop();
    }
    
    public void testPurgeQueueWithActiveConsumer() throws Exception {
        createProducerAndSendMessages();        
        QueueViewMBean proxy = getProxyToQueueViewMBean();
        createConsumer();
        proxy.purge();
        assertEquals("Queue size is not zero, it's " + proxy.getQueueSize(), 0, proxy.getQueueSize());
    }

    private QueueViewMBean getProxyToQueueViewMBean()
            throws MalformedObjectNameException, JMSException {
        ObjectName queueViewMBeanName = new ObjectName("org.apache.activemq" + ":Type=Queue,Destination=" + 
                queue.getQueueName() + ",BrokerName=localhost");
        QueueViewMBean proxy = (QueueViewMBean)MBeanServerInvocationHandler.newProxyInstance(
                broker.getManagementContext().getMBeanServer(), 
                queueViewMBeanName, QueueViewMBean.class, true);
         
         return proxy;
    }
    
    private void createProducerAndSendMessages() throws Exception {
        session =  connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
        queue = session.createQueue("test1");
        MessageProducer producer = session.createProducer(queue);
        for(int i=0; i<10000; i++) {
            TextMessage message = session.createTextMessage("message "+i);
            producer.send(message);
        }
        producer.close();
    }
    
    private void createConsumer() throws Exception {
        consumer = session.createConsumer(queue);
        // wait for buffer fill out
        Thread.sleep(5*1000);
        
        for(int i = 0; i < 100; ++i) {
            Message message = consumer.receive();
            message.acknowledge();
        }
    }

}
{code}

What I'm finding is that failure is intermittent, but I am able to see it once in a while: 

{panel}
junit.framework.AssertionFailedError: Queue size is not zero expected:<0> but was:<-60>
	at junit.framework.Assert.fail(Assert.java:47)
	at junit.framework.Assert.failNotEquals(Assert.java:282)
	at junit.framework.Assert.assertEquals(Assert.java:64)
	at junit.framework.Assert.assertEquals(Assert.java:136)
	at org.apache.activemq.broker.region.QueuePurgeTest.testPurgeQueueWithActiveConsumer(QueuePurgeTest.java:56)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at junit.framework.TestCase.runTest(TestCase.java:154)
	at junit.framework.TestCase.runBare(TestCase.java:127)
	at junit.framework.TestResult$1.protect(TestResult.java:106)
	at junit.framework.TestResult.runProtected(TestResult.java:124)
	at junit.framework.TestResult.run(TestResult.java:109)
	at junit.framework.TestCase.run(TestCase.java:118)
	at junit.framework.TestSuite.runTest(TestSuite.java:208)
	at junit.framework.TestSuite.run(TestSuite.java:203)
	at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
{panel}

> Negative queue size (reproducible)
> ----------------------------------
>
>                 Key: AMQ-1940
>                 URL: https://issues.apache.org/activemq/browse/AMQ-1940
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.2.0
>         Environment: Found on Windows but reproduced under Linux
>            Reporter: Vadim Chekan
>            Priority: Critical
>         Attachments: Main.java
>
>
> When you "purge" queue from web admin console, it zeroes queue message
> counter. But if you have an active consumer at that time which
> pre-fetched messages than your consumer will keep sending ack as it
> process messages from its buffer. ActiveMQ will keep decrement counter
> upon receiving each ack. So when consumer is done queue will show
> MINUS<consumer buffer size>.

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