Java tutorial
/** * 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.drill.exec.rpc; import io.netty.channel.ChannelHandler; import io.netty.channel.ChannelHandlerContext; public class RpcExceptionHandler<C extends RemoteConnection> implements ChannelHandler { static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(RpcExceptionHandler.class); private final C connection; public RpcExceptionHandler(C connection) { this.connection = connection; } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { if (!ctx.channel().isOpen() || cause.getMessage().equals("Connection reset by peer")) { logger.warn("Exception occurred with closed channel. Connection: {}", connection.getName(), cause); return; } else { logger.error("Exception in RPC communication. Connection: {}. Closing connection.", connection.getName(), cause); ctx.close(); } } @Override public void handlerAdded(ChannelHandlerContext ctx) throws Exception { } @Override public void handlerRemoved(ChannelHandlerContext ctx) throws Exception { } }