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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.qpid.test.framework;
import org.apache.log4j.Logger;
import javax.jms.Message;
import javax.jms.MessageListener;
import java.util.concurrent.atomic.AtomicInteger;
/**
* MessageMonitor is used to record information about messages received. This will provide methods to check various
* properties, such as the type, number and content of messages received in order to verify the correct behaviour of
* tests.
*
* <p/><table id="crc"><caption>CRC Card</caption>
* <tr><th> Responsibilities <th> Collaborations
* <tr><td> Count incoming messages.
* <tr><td> Record time ellapsed since the arrival of the first message.
* <tr><td> Reset all counts and timings.
* </table>
*/
public class MessageMonitor implements MessageListener
{
/** Used for debugging. */
private final Logger log = Logger.getLogger(MessageMonitor.class);
/** Holds the count of messages received since the last query. */
protected AtomicInteger numMessages = new AtomicInteger();
/** Holds the time of arrival of the first message. */
protected Long firstMessageTime = null;
/**
* Handles received messages. Does Nothing.
*
* @param message The message. Ignored.
*/
public void onMessage(Message message)
{
// log.debug("public void onMessage(Message message): called");
numMessages.getAndIncrement();
}
/**
* Gets the count of messages.
*
* @return The count of messages.
*/
public int getNumMessage()
{
if (firstMessageTime == null)
{
firstMessageTime = System.nanoTime();
}
return numMessages.get();
}
/**
* Gets the time elapsed since the first message arrived, in nanos, or zero if no messages have arrived yet.
*
* @return The time elapsed since the first message arrived, in nanos, or zero if no messages have arrived yet.
*/
public long getTime()
{
if (firstMessageTime != null)
{
return System.nanoTime() - firstMessageTime;
}
else
{
return 0L;
}
}
/**
* Resets the message count and timer to zero.
*/
public void reset()
{
numMessages.set(0);
firstMessageTime = null;
}
}
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