1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 * 19 */ 20 package org.apache.mina.example.reverser; 21 22 import org.apache.mina.core.service.IoHandler; 23 import org.apache.mina.core.service.IoHandlerAdapter; 24 import org.apache.mina.core.session.IoSession; 25 26 /** 27 * {@link IoHandler} implementation of reverser server protocol. 28 * 29 * @author The Apache MINA Project (dev@mina.apache.org) 30 * @version $Rev: 671827 $, $Date: 2008-06-26 10:49:48 +0200 (jeu, 26 jun 2008) $, 31 */ 32 public class ReverseProtocolHandler extends IoHandlerAdapter { 33 @Override 34 public void exceptionCaught(IoSession session, Throwable cause) { 35 // Close connection when unexpected exception is caught. 36 session.close(); 37 } 38 39 @Override 40 public void messageReceived(IoSession session, Object message) { 41 // Reverse reveiced string 42 String str = message.toString(); 43 StringBuffer buf = new StringBuffer(str.length()); 44 for (int i = str.length() - 1; i >= 0; i--) { 45 buf.append(str.charAt(i)); 46 } 47 48 // and write it back. 49 session.write(buf.toString()); 50 } 51 }