alluxio.worker.netty.UnsupportedMessageHandler.java Source code

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Here is the source code for alluxio.worker.netty.UnsupportedMessageHandler.java

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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.worker.netty;

import alluxio.exception.status.UnimplementedException;
import alluxio.network.protocol.RPCProtoMessage;

import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

import javax.annotation.concurrent.ThreadSafe;

/**
 * Netty handler which replies to the client with an unknown message error for message types
 * which are no longer supported.
 */
@ChannelHandler.Sharable
@ThreadSafe
public class UnsupportedMessageHandler extends ChannelInboundHandlerAdapter {
    /**
     * Constructs a new unsupported message handler.
     */
    public UnsupportedMessageHandler() {
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object object) throws Exception {
        if (object instanceof RPCProtoMessage) { // Unknown proto message, reply proto.
            RPCProtoMessage resp = RPCProtoMessage
                    .createResponse(new UnimplementedException("Unrecognized RPC: " + object));
            ctx.writeAndFlush(resp);
        } else { // Unknown message, this should not happen.
            ctx.fireChannelRead(object);
        }
    }
}