/*
* 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.RPCErrorResponse;
import alluxio.network.protocol.RPCMessage;
import alluxio.network.protocol.RPCProtoMessage;
import alluxio.network.protocol.RPCResponse;
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 DataServerUnsupportedMessageHandler extends ChannelInboundHandlerAdapter {
/**
* Constructs a new unsupported message handler.
*/
public DataServerUnsupportedMessageHandler() {}
@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 if (object instanceof RPCMessage) { // Unknown non-proto message, reply non-proto.
RPCErrorResponse resp = new RPCErrorResponse(RPCResponse.Status.UNKNOWN_MESSAGE_ERROR);
ctx.writeAndFlush(resp);
} else { // Unknown message, this should not happen.
ctx.fireChannelRead(object);
}
}
}