2008-08-08 02:37:18 +02:00
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/*
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2009-08-28 09:15:49 +02:00
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* Copyright 2009 Red Hat, Inc.
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2008-08-08 02:37:18 +02:00
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*
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2009-08-28 09:15:49 +02:00
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* Red Hat licenses this file to you under the Apache License, version 2.0
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* (the "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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2008-08-08 02:37:18 +02:00
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*
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2009-08-28 09:15:49 +02:00
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* http://www.apache.org/licenses/LICENSE-2.0
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2008-08-08 03:27:24 +02:00
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*
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2009-08-28 09:15:49 +02:00
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 02:37:18 +02:00
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2008-09-04 07:48:41 +02:00
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import java.io.ObjectInputStream;
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2008-08-08 02:37:18 +02:00
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import java.io.ObjectOutputStream;
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import java.io.OutputStream;
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2008-12-08 10:02:33 +01:00
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import java.util.concurrent.atomic.AtomicReference;
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2008-08-08 02:37:18 +02:00
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2008-08-08 03:40:10 +02:00
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import org.jboss.netty.buffer.ChannelBuffer;
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2008-12-08 10:02:33 +01:00
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import org.jboss.netty.buffer.ChannelBufferFactory;
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2008-08-08 03:40:10 +02:00
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import org.jboss.netty.buffer.ChannelBufferOutputStream;
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2008-12-08 10:02:33 +01:00
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import org.jboss.netty.buffer.ChannelBuffers;
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2008-12-17 08:38:32 +01:00
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import org.jboss.netty.channel.Channel;
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2008-08-08 03:40:10 +02:00
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import org.jboss.netty.channel.ChannelHandlerContext;
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2008-12-17 08:38:32 +01:00
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import org.jboss.netty.handler.codec.oneone.OneToOneEncoder;
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2008-08-08 02:37:18 +02:00
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/**
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2008-09-04 07:48:41 +02:00
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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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2010-01-26 10:04:19 +01:00
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* @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
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* @author <a href="http://gleamynode.net/">Trustin Lee</a>
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2008-08-08 02:37:18 +02:00
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*/
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2008-12-17 08:38:32 +01:00
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public class CompatibleObjectEncoder extends OneToOneEncoder {
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2008-08-08 02:37:18 +02:00
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2008-12-08 10:02:33 +01:00
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private final AtomicReference<ChannelBuffer> buffer =
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new AtomicReference<ChannelBuffer>();
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2008-08-08 02:37:18 +02:00
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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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2008-09-04 07:48:41 +02:00
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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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2008-08-08 02:37:18 +02:00
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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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2008-09-04 07:48:41 +02:00
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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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2008-08-08 02:37:18 +02:00
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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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2008-09-04 07:48:41 +02:00
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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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2008-12-17 08:38:32 +01:00
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@Override
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protected Object encode(ChannelHandlerContext context, Channel channel, Object msg) throws Exception {
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ChannelBuffer buffer = buffer(context);
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ObjectOutputStream oout = this.oout;
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2008-08-08 02:37:18 +02:00
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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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2008-12-08 11:07:06 +01:00
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buffer.discardReadBytes();
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2008-08-08 02:37:18 +02:00
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}
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}
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2008-12-17 08:38:32 +01:00
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oout.writeObject(msg);
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oout.flush();
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2011-11-12 19:25:27 +01:00
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return buffer.readBytes(buffer.readableBytes());
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2008-08-08 02:37:18 +02:00
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}
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2008-12-08 10:02:33 +01:00
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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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2008-08-08 02:37:18 +02:00
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}
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