NettyByteToMessageCodec.java

/*
 * Copyright (c) [2016] [ <ether.camp> ]
 * This file is part of the ethereumJ library.
 *
 * The ethereumJ library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The ethereumJ library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the ethereumJ library. If not, see <http://www.gnu.org/licenses/>.
 */
package org.ethereum.net.rlpx;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageCodec;
import io.netty.handler.codec.ByteToMessageDecoder;

import java.util.List;

/**
 * Since decoder field is not modifiable in the ByteToMessageCodec this class
 * overrides it to set the COMPOSITE_CUMULATOR for ByteToMessageDecoder as it
 * is more effective than the default one.
 */
public abstract class NettyByteToMessageCodec<I> extends ByteToMessageCodec<I> {

    private final ByteToMessageDecoder decoder = new ByteToMessageDecoder() {
        {
            setCumulator(COMPOSITE_CUMULATOR);
        }

        @Override
        public void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
            NettyByteToMessageCodec.this.decode(ctx, in, out);
        }

        @Override
        protected void decodeLast(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
            NettyByteToMessageCodec.this.decodeLast(ctx, in, out);
        }
    };

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        decoder.channelReadComplete(ctx);
        super.channelReadComplete(ctx);
    }
    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        decoder.channelInactive(ctx);
        super.channelInactive(ctx);
    }
    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        decoder.handlerAdded(ctx);
        super.handlerAdded(ctx);
    }
    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        decoder.handlerRemoved(ctx);
        super.handlerRemoved(ctx);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        decoder.channelRead(ctx, msg);
    }
}