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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.server.queue;
import org.apache.qpid.server.virtualhost.VirtualHost;
import org.apache.log4j.Logger;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
/**
* This is an abstract base class to handle
*/
public abstract class FlowableBaseQueueEntryList implements FlowableQueueEntryList
{
private static final Logger _log = Logger.getLogger(FlowableBaseQueueEntryList.class);
private final AtomicInteger _atomicQueueCount = new AtomicInteger(0);
private final AtomicLong _atomicQueueSize = new AtomicLong(0L);
private final AtomicLong _atomicQueueInMemory = new AtomicLong(0L);
/** The maximum amount of memory that is allocated to this queue. Beyond this the queue will flow to disk. */
private long _memoryUsageMaximum = 0;
/** The minimum amount of memory that is allocated to this queue. If the queueDepth hits this level then more flowed data can be read in. */
private long _memoryUsageMinimum = 0;
private AtomicBoolean _flowed;
private QueueBackingStore _backingStore;
protected AMQQueue _queue;
FlowableBaseQueueEntryList(AMQQueue queue)
{
_queue = queue;
_flowed = new AtomicBoolean(false);
VirtualHost vhost = queue.getVirtualHost();
if (vhost != null)
{
_backingStore = vhost.getQueueBackingStore();
}
}
public void setFlowed(boolean flowed)
{
if (_flowed.get() != flowed)
{
_log.info("Marking Queue(" + _queue.getName() + ") as flowed (" + flowed + ")");
_flowed.set(flowed);
}
}
public boolean isFlowed()
{
return _flowed.get();
}
public int size()
{
return _atomicQueueCount.get();
}
public long dataSize()
{
return _atomicQueueSize.get();
}
public long memoryUsed()
{
return _atomicQueueInMemory.get();
}
public void setMemoryUsageMaximum(long maximumMemoryUsage)
{
_memoryUsageMaximum = maximumMemoryUsage;
// Don't attempt to start the inhaler/purger unless we have a minimum value specified.
if (_memoryUsageMaximum > 0)
{
// If we've increased the max memory above what we have in memory then we can inhale more
if (_memoryUsageMaximum > _atomicQueueInMemory.get())
{
//TODO start inhaler
}
else // if we have now have to much memory in use we need to purge.
{
//TODO start purger
}
}
}
public long getMemoryUsageMaximum()
{
return _memoryUsageMaximum;
}
public void setMemoryUsageMinimum(long minimumMemoryUsage)
{
_memoryUsageMinimum = minimumMemoryUsage;
// Don't attempt to start the inhaler unless we have a minimum value specified.
if (_memoryUsageMinimum > 0)
{
// If we've increased the minimum memory above what we have in memory then we need to inhale more
if (_memoryUsageMinimum >= _atomicQueueInMemory.get())
{
//TODO start inhaler
}
}
}
public long getMemoryUsageMinimum()
{
return _memoryUsageMinimum;
}
protected boolean willCauseFlowToDisk(QueueEntryImpl queueEntry)
{
return _memoryUsageMaximum != 0 && memoryUsed() + queueEntry.getSize() > _memoryUsageMaximum;
}
protected void incrementCounters(final QueueEntryImpl queueEntry)
{
_atomicQueueCount.incrementAndGet();
_atomicQueueSize.addAndGet(queueEntry.getSize());
if (!willCauseFlowToDisk(queueEntry))
{
_atomicQueueInMemory.addAndGet(queueEntry.getSize());
}
else
{
setFlowed(true);
flowingToDisk(queueEntry);
}
}
/**
* Called when we are now flowing to disk
* @param queueEntry the entry that is being flowed to disk
*/
protected void flowingToDisk(QueueEntryImpl queueEntry)
{
try
{
queueEntry.flow();
}
catch (UnableToFlowMessageException e)
{
_atomicQueueInMemory.addAndGet(queueEntry.getSize());
}
}
protected void dequeued(QueueEntryImpl queueEntry)
{
_atomicQueueCount.decrementAndGet();
_atomicQueueSize.addAndGet(-queueEntry.getSize());
if (!queueEntry.isFlowed())
{
_atomicQueueInMemory.addAndGet(-queueEntry.getSize());
}
}
public QueueBackingStore getBackingStore()
{
return _backingStore;
}
}
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