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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.mina.common.IoFilterChain;
import org.apache.mina.common.ThreadModel;
import org.apache.mina.filter.ReferenceCountingIoFilter;
/**
* ReadWriteThreadModel is a Mina i/o filter chain factory, which creates a filter chain with seperate filters to
* handle read and write events. The seperate filters are {@link PoolingFilter}s, which have thread pools to handle
* these events. The effect of this is that reading and writing may happen concurrently.
*
* <p/>Socket i/o will only happen with concurrent reads and writes if Mina has seperate selector threads for each.
*
* <p/><table id="crc"><caption>CRC Card</caption>
* <tr><th> Responsibilities <th> Collaborations
* <tr><td> Create a filter chain with seperate read and write thread pools for read/write Mina events.
* <td> {@link PoolingFilter}
* </table>
*/
public class ReadWriteThreadModel implements ThreadModel
{
/** Holds the singleton instance of this factory. */
private static final ReadWriteThreadModel _instance = new ReadWriteThreadModel();
/** Holds the thread pooling filter for reads. */
private final PoolingFilter _asynchronousReadFilter;
/** Holds the thread pooloing filter for writes. */
private final PoolingFilter _asynchronousWriteFilter;
/**
* Creates a new factory for concurrent i/o, thread pooling filter chain construction. This is private, so that
* only a singleton instance of the factory is ever created.
*/
private ReadWriteThreadModel()
{
final ReferenceCountingExecutorService executor = ReferenceCountingExecutorService.getInstance();
_asynchronousReadFilter = PoolingFilter.createAynschReadPoolingFilter(executor, "AsynchronousReadFilter");
_asynchronousWriteFilter = PoolingFilter.createAynschWritePoolingFilter(executor, "AsynchronousWriteFilter");
}
/**
* Gets the singleton instance of this filter chain factory.
*
* @return The singleton instance of this filter chain factory.
*/
public static ReadWriteThreadModel getInstance()
{
return _instance;
}
/**
* Gets the read filter.
*
* @return The read filter.
*/
public PoolingFilter getAsynchronousReadFilter()
{
return _asynchronousReadFilter;
}
/**
* Gets the write filter.
*
* @return The write filter.
*/
public PoolingFilter getAsynchronousWriteFilter()
{
return _asynchronousWriteFilter;
}
/**
* Adds the concurrent read and write filters to a filter chain.
*
* @param chain The Mina filter chain to add to.
*/
public void buildFilterChain(IoFilterChain chain)
{
chain.addFirst("AsynchronousReadFilter", new ReferenceCountingIoFilter(_asynchronousReadFilter));
chain.addLast("AsynchronousWriteFilter", new ReferenceCountingIoFilter(_asynchronousWriteFilter));
}
}
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