| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.giraph.comm.netty.handler; |
| |
| import org.apache.giraph.comm.netty.NettyClient; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.log4j.Logger; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.channel.ChannelHandlerContext; |
| import io.netty.channel.ChannelInboundHandlerAdapter; |
| import io.netty.util.ReferenceCountUtil; |
| |
| import javax.net.ssl.SSLException; |
| |
| import static org.apache.giraph.conf.GiraphConstants.NETTY_SIMULATE_FIRST_RESPONSE_FAILED; |
| |
| /** |
| * Generic handler of responses. |
| */ |
| public class ResponseClientHandler extends ChannelInboundHandlerAdapter { |
| /** Class logger */ |
| private static final Logger LOG = |
| Logger.getLogger(ResponseClientHandler.class); |
| /** Already dropped first response? (used if dropFirstResponse == true) */ |
| private static volatile boolean ALREADY_DROPPED_FIRST_RESPONSE = false; |
| /** Drop first response (used for simulating failure) */ |
| private final boolean dropFirstResponse; |
| /** Netty client that does the actual I/O and keeps track of open requests */ |
| private final NettyClient nettyClient; |
| /** Handler for uncaught exceptions */ |
| private final Thread.UncaughtExceptionHandler exceptionHandler; |
| |
| /** |
| * Constructor. |
| * @param nettyClient Client that does the actual I/O |
| * @param conf Configuration |
| * @param exceptionHandler Handles uncaught exceptions |
| */ |
| public ResponseClientHandler( |
| NettyClient nettyClient, |
| Configuration conf, |
| Thread.UncaughtExceptionHandler exceptionHandler) { |
| this.nettyClient = nettyClient; |
| dropFirstResponse = NETTY_SIMULATE_FIRST_RESPONSE_FAILED.get(conf); |
| this.exceptionHandler = exceptionHandler; |
| } |
| |
| @Override |
| public void channelRead(ChannelHandlerContext ctx, Object msg) |
| throws Exception { |
| if (!(msg instanceof ByteBuf)) { |
| throw new IllegalStateException("channelRead: Got a " + |
| "non-ByteBuf message " + msg); |
| } |
| |
| ByteBuf buf = (ByteBuf) msg; |
| int senderId = -1; |
| long requestId = -1; |
| int response = -1; |
| try { |
| senderId = buf.readInt(); |
| requestId = buf.readLong(); |
| response = buf.readInt(); |
| } catch (IndexOutOfBoundsException e) { |
| throw new IllegalStateException( |
| "channelRead: Got IndexOutOfBoundsException ", e); |
| } |
| ReferenceCountUtil.release(buf); |
| |
| boolean shouldDrop = false; |
| // Simulate a failed response on the first response (if desired) |
| if (dropFirstResponse && !ALREADY_DROPPED_FIRST_RESPONSE) { |
| LOG.info("channelRead: Simulating dropped response " + response + |
| " for request " + requestId); |
| setAlreadyDroppedFirstResponse(); |
| shouldDrop = true; |
| } |
| |
| nettyClient.messageReceived(senderId, requestId, response, shouldDrop); |
| } |
| |
| /** |
| * Set already dropped first response flag |
| */ |
| private static void setAlreadyDroppedFirstResponse() { |
| ALREADY_DROPPED_FIRST_RESPONSE = true; |
| } |
| |
| @Override |
| public void channelInactive(ChannelHandlerContext ctx) throws Exception { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("channelClosed: Closed the channel on " + |
| ctx.channel().remoteAddress()); |
| } |
| ctx.fireChannelInactive(); |
| } |
| |
| @Override |
| public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) |
| throws Exception { |
| // If SSLException, fail the client |
| if (cause instanceof SSLException) { |
| exceptionHandler.uncaughtException(Thread.currentThread(), cause); |
| } else { |
| LOG.warn("exceptionCaught: Channel channelId=" + |
| ctx.channel().hashCode() + " failed with remote address " + |
| ctx.channel().remoteAddress(), cause); |
| } |
| } |
| } |
| |