| /** |
| * 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.hadoop.oncrpc; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.jboss.netty.channel.ChannelHandlerContext; |
| import org.jboss.netty.channel.ChannelStateEvent; |
| import org.jboss.netty.channel.ExceptionEvent; |
| import org.jboss.netty.channel.MessageEvent; |
| import org.jboss.netty.channel.SimpleChannelHandler; |
| |
| /** |
| * A simple TCP based RPC client handler used by {@link SimpleTcpServer}. |
| */ |
| public class SimpleTcpClientHandler extends SimpleChannelHandler { |
| public static final Log LOG = LogFactory.getLog(SimpleTcpClient.class); |
| protected final XDR request; |
| |
| public SimpleTcpClientHandler(XDR request) { |
| this.request = request; |
| } |
| |
| @Override |
| public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) { |
| // Send the request |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("sending PRC request"); |
| } |
| ChannelBuffer outBuf = XDR.writeMessageTcp(request, true); |
| e.getChannel().write(outBuf); |
| } |
| |
| /** |
| * Shutdown connection by default. Subclass can override this method to do |
| * more interaction with the server. |
| */ |
| @Override |
| public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) { |
| e.getChannel().close(); |
| } |
| |
| @Override |
| public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) { |
| LOG.warn("Unexpected exception from downstream: ", e.getCause()); |
| e.getChannel().close(); |
| } |
| } |