2008-08-08 02:37:18 +02:00
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/*
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2008-08-08 03:27:24 +02:00
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* JBoss, Home of Professional Open Source
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2008-08-08 02:37:18 +02:00
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*
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* Copyright 2008, Red Hat Middleware LLC, and individual contributors
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* by the @author tags. See the COPYRIGHT.txt in the distribution for a
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* full listing of individual contributors.
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2008-08-08 02:37:18 +02:00
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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2008-08-08 02:37:18 +02:00
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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2008-08-08 03:27:24 +02:00
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* License along with this software; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
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2008-08-08 02:37:18 +02:00
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*/
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2008-08-08 03:40:10 +02:00
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package org.jboss.netty.handler.codec.serialization;
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2008-08-08 03:40:10 +02:00
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import static org.jboss.netty.channel.Channels.*;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.OutputStream;
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import java.util.concurrent.atomic.AtomicReference;
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import org.jboss.netty.buffer.ChannelBuffer;
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import org.jboss.netty.buffer.ChannelBufferFactory;
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import org.jboss.netty.buffer.ChannelBufferOutputStream;
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import org.jboss.netty.buffer.ChannelBuffers;
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import org.jboss.netty.channel.ChannelDownstreamHandler;
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import org.jboss.netty.channel.ChannelEvent;
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import org.jboss.netty.channel.ChannelHandlerContext;
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import org.jboss.netty.channel.ChannelPipelineCoverage;
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import org.jboss.netty.channel.MessageEvent;
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/**
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* An encoder which serializes a Java object into a {@link ChannelBuffer}
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* (interoperability version).
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* <p>
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* This encoder is interoperable with the standard Java object streams such as
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* {@link ObjectInputStream} and {@link ObjectOutputStream}.
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*
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* @author The Netty Project (netty-dev@lists.jboss.org)
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* @author Trustin Lee (tlee@redhat.com)
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*
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* @version $Rev:231 $, $Date:2008-06-12 16:44:50 +0900 (목, 12 6월 2008) $
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*/
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@ChannelPipelineCoverage("one")
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public class CompatibleObjectEncoder implements ChannelDownstreamHandler {
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private final AtomicReference<ChannelBuffer> buffer =
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new AtomicReference<ChannelBuffer>();
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private final int resetInterval;
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private volatile ObjectOutputStream oout;
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private int writtenObjects;
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/**
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* Creates a new instance with the reset interval of {@code 16}.
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*/
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public CompatibleObjectEncoder() {
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this(16); // Reset at every sixteen writes
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}
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/**
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* Creates a new instance.
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*
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* @param resetInterval
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* the number of objects between {@link ObjectOutputStream#reset()}.
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* {@code 0} will disable resetting the stream, but the remote
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* peer will be at the risk of getting {@link OutOfMemoryError} in
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* the long term.
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*/
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public CompatibleObjectEncoder(int resetInterval) {
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if (resetInterval < 0) {
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throw new IllegalArgumentException(
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"resetInterval: " + resetInterval);
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}
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this.resetInterval = resetInterval;
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}
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/**
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* Creates a new {@link ObjectOutputStream} which wraps the specified
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* {@link OutputStream}. Override this method to use a subclass of the
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* {@link ObjectOutputStream}.
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*/
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protected ObjectOutputStream newObjectOutputStream(OutputStream out) throws Exception {
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return new ObjectOutputStream(out);
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}
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public void handleDownstream(
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ChannelHandlerContext context, ChannelEvent evt) throws Exception {
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if (!(evt instanceof MessageEvent)) {
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context.sendDownstream(evt);
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return;
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}
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MessageEvent e = (MessageEvent) evt;
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ChannelBuffer buffer = buffer(context);
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ObjectOutputStream oout = this.oout;
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if (resetInterval != 0) {
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// Resetting will prevent OOM on the receiving side.
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writtenObjects ++;
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if (writtenObjects % resetInterval == 0) {
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oout.reset();
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2008-12-08 11:08:34 +01:00
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// Also discard the byproduct to avoid OOM on the sending side.
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buffer.discardReadBytes();
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}
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}
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oout.writeObject(e.getMessage());
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oout.flush();
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ChannelBuffer encoded = buffer.readBytes(buffer.readableBytes());
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write(context, e.getChannel(), e.getFuture(), encoded, e.getRemoteAddress());
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}
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private ChannelBuffer buffer(ChannelHandlerContext ctx) throws Exception {
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ChannelBuffer buf = buffer.get();
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if (buf == null) {
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ChannelBufferFactory factory = ctx.getChannel().getConfig().getBufferFactory();
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buf = ChannelBuffers.dynamicBuffer(factory);
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if (buffer.compareAndSet(null, buf)) {
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boolean success = false;
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try {
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oout = newObjectOutputStream(new ChannelBufferOutputStream(buf));
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success = true;
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} finally {
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if (!success) {
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oout = null;
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}
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}
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} else {
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buf = buffer.get();
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}
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}
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return buf;
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}
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}
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