bftsmart.communication.client.netty.NettyTOMMessageEncoder.java Source code

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Here is the source code for bftsmart.communication.client.netty.NettyTOMMessageEncoder.java

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/**
Copyright (c) 2007-2013 Alysson Bessani, Eduardo Alchieri, Paulo Sousa, and the authors indicated in the @author tags
    
Licensed 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 bftsmart.communication.client.netty;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.ReentrantReadWriteLock;

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

import bftsmart.tom.core.messages.TOMMessage;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;

public class NettyTOMMessageEncoder extends MessageToByteEncoder<TOMMessage> {

    private boolean isClient;
    private ConcurrentHashMap<Integer, NettyClientServerSession> sessionTable;
    private ReentrantReadWriteLock rl;

    public NettyTOMMessageEncoder(boolean isClient,
            ConcurrentHashMap<Integer, NettyClientServerSession> sessionTable, ReentrantReadWriteLock rl) {
        this.isClient = isClient;
        this.sessionTable = sessionTable;
        this.rl = rl;
    }

    @Override
    protected void encode(ChannelHandlerContext context, TOMMessage sm, ByteBuf buffer) throws Exception {
        byte[] msgData;
        byte[] signatureData = null;

        msgData = sm.serializedMessage;
        if (sm.signed) {
            //signature was already produced before            
            signatureData = sm.serializedMessageSignature;
        }

        int dataLength = Integer.BYTES + msgData.length + Integer.BYTES
                + (signatureData != null ? signatureData.length : 0);

        /* msg size */
        buffer.writeInt(dataLength);

        /* data to be sent */
        buffer.writeInt(msgData.length);
        buffer.writeBytes(msgData);

        /* signature */
        if (signatureData != null) {
            buffer.writeInt(signatureData.length);
            buffer.writeBytes(signatureData);
        } else {
            buffer.writeInt(0);
        }

        context.flush();
    }

}