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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.proxy;
21  
22  import java.nio.charset.Charset;
23  
24  import org.apache.mina.core.buffer.IoBuffer;
25  import org.apache.mina.core.service.IoHandlerAdapter;
26  import org.apache.mina.core.session.IoSession;
27  import org.apache.mina.core.session.TrafficMask;
28  import org.slf4j.Logger;
29  import org.slf4j.LoggerFactory;
30  
31  /**
32   * Base class of {@link org.apache.mina.core.service.IoHandler} classes which handle
33   * proxied connections.
34   *
35   * @author The Apache MINA Project (dev@mina.apache.org)
36   * @version $Rev$, $Date$
37   *
38   */
39  public abstract class AbstractProxyIoHandler extends IoHandlerAdapter {
40      private static final Charset CHARSET = Charset.forName("iso8859-1");
41      public static final String OTHER_IO_SESSION = AbstractProxyIoHandler.class.getName()+".OtherIoSession";
42  
43      private final Logger logger = LoggerFactory.getLogger(getClass());
44      
45      @Override
46      public void sessionCreated(IoSession session) throws Exception {
47          session.setTrafficMask(TrafficMask.NONE);
48      }
49  
50      @Override
51      public void sessionClosed(IoSession session) throws Exception {
52          if (session.getAttribute( OTHER_IO_SESSION ) != null) {
53              IoSession sess = (IoSession) session.getAttribute(OTHER_IO_SESSION);
54              sess.setAttribute(OTHER_IO_SESSION, null);
55              sess.closeOnFlush();
56              session.setAttribute(OTHER_IO_SESSION, null);
57          }
58      }
59  
60      @Override
61      public void messageReceived(IoSession session, Object message)
62              throws Exception {
63          IoBuffer rb = (IoBuffer) message;
64          IoBuffer wb = IoBuffer.allocate(rb.remaining());
65          rb.mark();
66          wb.put(rb);
67          wb.flip();
68          ((IoSession) session.getAttribute(OTHER_IO_SESSION)).write(wb);
69          rb.reset();
70          logger.info(rb.getString(CHARSET.newDecoder()));
71      }
72  }