/*
* 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.mina.filter.codec.support;
import org.apache.mina.common.ByteBuffer;
import org.apache.mina.common.WriteFuture;
import org.apache.mina.filter.codec.ProtocolEncoderOutput;
import org.apache.mina.util.Queue;
/**
* A {@link ProtocolEncoderOutput} based on queue.
*
* @author The Apache Directory Project (mina-dev@directory.apache.org)
* @version $Rev: 436993 $, $Date: 2006-08-26 07:36:56 +0900 (토, 26 8월 2006) $
*/
public abstract class SimpleProtocolEncoderOutput implements ProtocolEncoderOutput
{
private final Queue bufferQueue = new Queue();
public SimpleProtocolEncoderOutput()
{
}
public Queue getBufferQueue()
{
return bufferQueue;
}
public void write( ByteBuffer buf )
{
bufferQueue.push( buf );
}
public void mergeAll()
{
int sum = 0;
final int size = bufferQueue.size();
if( size < 2 )
{
// no need to merge!
return;
}
// Get the size of merged BB
for( int i = size - 1; i >= 0; i -- )
{
sum += ( ( ByteBuffer ) bufferQueue.get( i ) ).remaining();
}
// Allocate a new BB that will contain all fragments
ByteBuffer newBuf = ByteBuffer.allocate( sum );
// and merge all.
for( ;; )
{
ByteBuffer buf = ( ByteBuffer ) bufferQueue.pop();
if( buf == null )
{
break;
}
newBuf.put( buf );
buf.release();
}
// Push the new buffer finally.
newBuf.flip();
bufferQueue.push(newBuf);
}
public WriteFuture flush()
{
Queue bufferQueue = this.bufferQueue;
WriteFuture future = null;
if( bufferQueue.isEmpty() )
{
return null;
}
else
{
for( ;; )
{
ByteBuffer buf = ( ByteBuffer ) bufferQueue.pop();
if( buf == null )
{
break;
}
// Flush only when the buffer has remaining.
if( buf.hasRemaining() )
{
future = doFlush( buf );
}
}
}
return future;
}
protected abstract WriteFuture doFlush( ByteBuffer buf );
}