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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.pool;
import org.apache.log4j.Logger;
import org.apache.mina.common.IdleStatus;
import org.apache.mina.common.IoFilterAdapter;
import org.apache.mina.common.IoSession;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
public class PoolingFilter extends IoFilterAdapter implements Job.JobCompletionHandler
{
private static final Logger _logger = Logger.getLogger(PoolingFilter.class);
public static final Set<EventType> READ_EVENTS = new HashSet<EventType>(Arrays.asList(EventType.RECEIVED));
public static final Set<EventType> WRITE_EVENTS = new HashSet<EventType>(Arrays.asList(EventType.WRITE));
private final ConcurrentMap<IoSession, Job> _jobs = new ConcurrentHashMap<IoSession, Job>();
private final ReferenceCountingExecutorService _poolReference;
private final Set<EventType> _asyncTypes;
private final String _name;
private final int _maxEvents = Integer.getInteger("amqj.server.read_write_pool.max_events", 10);
public PoolingFilter(ReferenceCountingExecutorService refCountingPool, Set<EventType> asyncTypes, String name)
{
_poolReference = refCountingPool;
_asyncTypes = asyncTypes;
_name = name;
}
private void fireEvent(IoSession session, Event event)
{
if (_asyncTypes.contains(event.getType()))
{
Job job = getJobForSession(session);
job.acquire(); //prevents this job being removed from _jobs
job.add(event);
if (job.activate())
{
_poolReference.getPool().execute(job);
}
}
else
{
event.process(session);
}
}
private Job getJobForSession(IoSession session)
{
Job job = _jobs.get(session);
return job == null ? createJobForSession(session) : job;
}
private Job createJobForSession(IoSession session)
{
return addJobForSession(session, new Job(session, this, _maxEvents));
}
private Job addJobForSession(IoSession session, Job job)
{
//atomic so ensures all threads agree on the same job
Job existing = _jobs.putIfAbsent(session, job);
return existing == null ? job : existing;
}
//Job.JobCompletionHandler
public void completed(IoSession session, Job job)
{
if (job.isComplete())
{
job.release();
if (!job.isReferenced())
{
_jobs.remove(session);
}
}
else
{
if (job.activate())
{
_poolReference.getPool().execute(job);
}
}
}
//IoFilter methods that are processed by threads on the pool
public void sessionOpened(NextFilter nextFilter, IoSession session) throws Exception
{
fireEvent(session, new Event(nextFilter, EventType.OPENED, null));
}
public void sessionClosed(NextFilter nextFilter, IoSession session) throws Exception
{
fireEvent(session, new Event(nextFilter, EventType.CLOSED, null));
}
public void sessionIdle(NextFilter nextFilter, IoSession session,
IdleStatus status) throws Exception
{
fireEvent(session, new Event(nextFilter, EventType.IDLE, status));
}
public void exceptionCaught(NextFilter nextFilter, IoSession session,
Throwable cause) throws Exception
{
fireEvent(session, new Event(nextFilter, EventType.EXCEPTION, cause));
}
public void messageReceived(NextFilter nextFilter, IoSession session,
Object message) throws Exception
{
//ByteBufferUtil.acquireIfPossible( message );
fireEvent(session, new Event(nextFilter, EventType.RECEIVED, message));
}
public void messageSent(NextFilter nextFilter, IoSession session,
Object message) throws Exception
{
//ByteBufferUtil.acquireIfPossible( message );
fireEvent(session, new Event(nextFilter, EventType.SENT, message));
}
public void filterWrite(NextFilter nextFilter, IoSession session, WriteRequest writeRequest) throws Exception
{
fireEvent(session, new Event(nextFilter, EventType.WRITE, writeRequest));
}
//IoFilter methods that are processed on current thread (NOT on pooled thread)
public void filterClose(NextFilter nextFilter, IoSession session) throws Exception
{
nextFilter.filterClose(session);
}
public void sessionCreated(NextFilter nextFilter, IoSession session)
{
nextFilter.sessionCreated(session);
}
public String toString()
{
return _name;
}
// LifeCycle methods
public void init()
{
_logger.info("Init called on PoolingFilter " + toString());
// called when the filter is initialised in the chain. If the reference count is
// zero this acquire will initialise the pool
_poolReference.acquireExecutorService();
}
public void destroy()
{
_logger.info("Destroy called on PoolingFilter " + toString());
// when the reference count gets to zero we release the executor service
_poolReference.releaseExecutorService();
}
}
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