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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.client.protocol;
import org.apache.mina.common.IoFilterAdapter;
import org.apache.mina.common.IoSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A MINA filter that monitors the numbers of messages pending to be sent by MINA. It outputs a message
* when a threshold has been exceeded, and has a frequency configuration so that messages are not output
* too often.
*
*/
public class ProtocolBufferMonitorFilter extends IoFilterAdapter
{
private static final Logger _logger = LoggerFactory.getLogger(ProtocolBufferMonitorFilter.class);
public static final long DEFAULT_FREQUENCY = 5000;
public static final int DEFAULT_THRESHOLD = 3000;
private int _bufferedMessages = 0;
private int _threshold;
private long _lastMessageOutputTime;
private long _outputFrequencyInMillis;
public ProtocolBufferMonitorFilter()
{
_threshold = DEFAULT_THRESHOLD;
_outputFrequencyInMillis = DEFAULT_FREQUENCY;
}
public ProtocolBufferMonitorFilter(int threshold, long frequency)
{
_threshold = threshold;
_outputFrequencyInMillis = frequency;
}
public void messageReceived(NextFilter nextFilter, IoSession session, Object message) throws Exception
{
_bufferedMessages++;
if (_bufferedMessages > _threshold)
{
long now = System.currentTimeMillis();
if ((now - _lastMessageOutputTime) > _outputFrequencyInMillis)
{
_logger.warn("Protocol message buffer exceeded threshold of " + _threshold + ". Current backlog: "
+ _bufferedMessages);
_lastMessageOutputTime = now;
}
}
nextFilter.messageReceived(session, message);
}
public void messageSent(NextFilter nextFilter, IoSession session, Object message) throws Exception
{
_bufferedMessages--;
nextFilter.messageSent(session, message);
}
public int getBufferedMessages()
{
return _bufferedMessages;
}
public int getThreshold()
{
return _threshold;
}
public void setThreshold(int threshold)
{
_threshold = threshold;
}
public long getOutputFrequencyInMillis()
{
return _outputFrequencyInMillis;
}
public void setOutputFrequencyInMillis(long outputFrequencyInMillis)
{
_outputFrequencyInMillis = outputFrequencyInMillis;
}
public long getLastMessageOutputTime()
{
return _lastMessageOutputTime;
}
}
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