/*
* Copyright (C) 2008 Trustin Heuiseung Lee
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA
*/
package net.gleamynode.netty.handler.codec.serialization;
import static net.gleamynode.netty.buffer.ChannelBuffers.*;
import static net.gleamynode.netty.channel.Channels.*;
import java.io.ObjectOutputStream;
import net.gleamynode.netty.buffer.ChannelBuffer;
import net.gleamynode.netty.buffer.ChannelBufferOutputStream;
import net.gleamynode.netty.channel.ChannelDownstreamHandler;
import net.gleamynode.netty.channel.ChannelEvent;
import net.gleamynode.netty.channel.ChannelHandlerContext;
import net.gleamynode.netty.channel.ChannelPipelineCoverage;
import net.gleamynode.netty.channel.MessageEvent;
/**
* @author The Netty Project (netty@googlegroups.com)
* @author Trustin Lee (trustin@gmail.com)
*
* @version $Rev:231 $, $Date:2008-06-12 16:44:50 +0900 (목, 12 6월 2008) $
*
*/
@ChannelPipelineCoverage("all")
public class ObjectEncoder implements ChannelDownstreamHandler {
private static final byte[] LENGTH_PLACEHOLDER = new byte[4];
private final int estimatedLength;
public ObjectEncoder() {
this(512);
}
public ObjectEncoder(int estimatedLength) {
if (estimatedLength <= 0) {
throw new IllegalArgumentException(
"estimatedLength: " + estimatedLength);
}
this.estimatedLength = estimatedLength;
}
public void handleDownstream(
ChannelHandlerContext context, ChannelEvent evt) throws Exception {
if (!(evt instanceof MessageEvent)) {
context.sendDownstream(evt);
return;
}
MessageEvent e = (MessageEvent) evt;
ChannelBufferOutputStream bout =
new ChannelBufferOutputStream(dynamicBuffer(estimatedLength));
bout.write(LENGTH_PLACEHOLDER);
ObjectOutputStream oout = new CompactObjectOutputStream(bout);
oout.writeObject(e.getMessage());
oout.flush();
oout.close();
ChannelBuffer msg = bout.buffer();
msg.setInt(0, msg.writerIndex() - 4);
write(context, e.getChannel(), e.getFuture(), msg);
}
}