elephant.rpc.network.netty.codec.JDKSerialMessageEncoder Maven / Gradle / Ivy

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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 elephant.rpc.network.netty.codec;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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 io.netty.handler.codec.serialization.ObjectDecoder;
import io.netty.handler.codec.serialization.ObjectDecoderInputStream;

/**
 * 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 JDKSerialMessageEncoder extends MessageToByteEncoder {
    private static final byte[] LENGTH_PLACEHOLDER = new byte[4];
    //
    private static Logger logger=LoggerFactory.getLogger(JDKSerialMessageEncoder.class);
    //
    public JDKSerialMessageEncoder(){
    }
    @Override
    protected void encode(ChannelHandlerContext ctx, Serializable msg, ByteBuf out) throws Exception {
    	long startTime=System.currentTimeMillis();
    	int startIdx = out.writerIndex();

        ByteBufOutputStream bout = new ByteBufOutputStream(out);
        bout.write(LENGTH_PLACEHOLDER);
        ObjectOutputStream oout = new CompactObjectOutputStream(bout);
        oout.writeObject(msg);
        oout.flush();
        oout.close();

        int endIdx = out.writerIndex();

        out.setInt(startIdx, endIdx - startIdx - 4);
        //
        long endTime=System.currentTimeMillis();
        if(logger.isDebugEnabled()){
        	logger.debug("JDKSerialMessageEncoder encode time:{}",
        			(endTime-startTime)
        			);
        }
    }
}