io.grapebaba.vineyard.common.codec.packet.PacketDecoder.java Source code

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Here is the source code for io.grapebaba.vineyard.common.codec.packet.PacketDecoder.java

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/*
 * Copyright 2015 281165273grape@gmail.com
 *
 * 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 io.grapebaba.vineyard.common.codec.packet;

import io.grapebaba.vineyard.common.protocol.packet.Packet;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ReplayingDecoder;

import java.util.List;

import static io.grapebaba.vineyard.common.protocol.packet.Packet.newBuilder;

/**
 * Decode the data packet through content length.
 */
public class PacketDecoder extends ReplayingDecoder<Packet> {

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
        final int payloadLength = in.readInt();
        final ByteBuf payload = in.readBytes(payloadLength);
        out.add(newBuilder().withBodyLength(payloadLength).withBodyByteBuf(payload).build());
    }
}