/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed 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.catalina.cluster.io;
/**
* The object reader object is an object used in conjunction with
* java.nio TCP messages. This object stores the message bytes in a
* <code>XByteBuffer</code> until a full package has been received.
* When a full package has been received, the append method will call messageDataReceived
* on the callback object associated with this object reader.<BR>
* This object uses an XByteBuffer which is an extendable object buffer that also allows
* for message encoding and decoding.
*
* @author Filip Hanik
* @version $Revision: 1.6 $, $Date: 2004/07/01 09:44:27 $
*/
import java.nio.channels.SocketChannel;
import java.nio.channels.Selector;
import java.nio.ByteBuffer;
import org.apache.catalina.cluster.io.XByteBuffer;
public class ObjectReader
{
private SocketChannel channel;
private Selector selector;
private ListenCallback callback;
private XByteBuffer buffer;
public ObjectReader( SocketChannel channel,
Selector selector,
ListenCallback callback ) {
this.channel = channel;
this.selector = selector;
this.callback = callback;
this.buffer = new XByteBuffer();
}
public SocketChannel getChannel() {
return this.channel;
}
public int append(byte[] data,int off,int len) throws java.io.IOException {
boolean result = false;
buffer.append(data,off,len);
int pkgCnt = buffer.countPackages();
return pkgCnt;
}
public int execute() throws java.io.IOException {
int pkgCnt = 0;
boolean pkgExists = buffer.doesPackageExist();
while ( pkgExists ) {
byte[] b = buffer.extractPackage(true);
callback.messageDataReceived(b);
pkgCnt++;
pkgExists = buffer.doesPackageExist();
}//end if
return pkgCnt;
}
public int write(ByteBuffer buf)
throws java.io.IOException {
return getChannel().write(buf);
}
}