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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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 io.netty.handler.codec.serialization;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufOutputStream;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;

import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

/**
 * An encoder which serializes a Java object into a {@link ByteBuf}.
 * 

* Please note that the serialized form this encoder produces is not * compatible with the standard {@link ObjectInputStream}. Please use * {@link ObjectDecoder} or {@link ObjectDecoderInputStream} to ensure the * interoperability with this encoder. */ @Sharable public class ObjectEncoder extends MessageToByteEncoder { private static final byte[] LENGTH_PLACEHOLDER = new byte[4]; @Override protected void encode(ChannelHandlerContext ctx, Serializable msg, ByteBuf out) throws Exception { int startIdx = out.writerIndex(); ByteBufOutputStream bout = new ByteBufOutputStream(out); ObjectOutputStream oout = null; try { bout.write(LENGTH_PLACEHOLDER); oout = new CompactObjectOutputStream(bout); oout.writeObject(msg); oout.flush(); } finally { if (oout != null) { oout.close(); } else { bout.close(); } } int endIdx = out.writerIndex(); out.setInt(startIdx, endIdx - startIdx - 4); } }





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