com.ibm.crail.namenode.rpc.netty.common.ResponseDecoder.java Source code

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Here is the source code for com.ibm.crail.namenode.rpc.netty.common.ResponseDecoder.java

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/*
 * Crail-Netty: An implementation of Crail DataNode and RPC interfaces
 *              to run on netty/TCP transport.
 *
 * Author: Animesh Trivedi <atr@zurich.ibm.com>
 *
 * Copyright (C) 2016, IBM Corporation
 *
 * 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 com.ibm.crail.namenode.rpc.netty.common;

import com.ibm.crail.namenode.rpc.netty.client.NettyRPCNamenodeClientGroup;

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

import java.util.List;

public class ResponseDecoder extends ByteToMessageDecoder {

    private NettyRPCNamenodeClientGroup group;

    public ResponseDecoder(NettyRPCNamenodeClientGroup grp) {
        this.group = grp;
    }

    @Override
    protected void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> list)
            throws Exception {
        if (byteBuf.readableBytes() < NettyResponse.CSIZE) {
            return;
        }
        long cookie = byteBuf.readLong();
        /* allocate a new response here and then proceed */
        NettyResponse resp = this.group.retriveAndRemove(cookie);
        resp.update(cookie, byteBuf);
        resp.getNettyCommonFuture().markDone();
    }
}