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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.netcat;
21  
22  import org.apache.mina.core.buffer.IoBuffer;
23  import org.apache.mina.core.service.IoHandler;
24  import org.apache.mina.core.service.IoHandlerAdapter;
25  import org.apache.mina.core.session.IdleStatus;
26  import org.apache.mina.core.session.IoSession;
27  
28  /**
29   * {@link IoHandler} implementation for NetCat client.  This class extended
30   * {@link IoHandlerAdapter} for convenience.
31   *
32   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
33   */
34  public class NetCatProtocolHandler extends IoHandlerAdapter {
35      @Override
36      public void sessionOpened(IoSession session) {
37          // Set reader idle time to 10 seconds.
38          // sessionIdle(...) method will be invoked when no data is read
39          // for 10 seconds.
40          session.getConfig().setIdleTime(IdleStatus.READER_IDLE, 10);
41      }
42  
43      @Override
44      public void sessionClosed(IoSession session) {
45          // Print out total number of bytes read from the remote peer.
46          System.err.println("Total " + session.getReadBytes() + " byte(s)");
47      }
48  
49      @Override
50      public void sessionIdle(IoSession session, IdleStatus status) {
51          // Close the connection if reader is idle.
52          if (status == IdleStatus.READER_IDLE) {
53              session.close(true);
54          }
55      }
56  
57      @Override
58      public void messageReceived(IoSession session, Object message) {
59          IoBuffer buf = (IoBuffer) message;
60          // Print out read buffer content.
61          while (buf.hasRemaining()) {
62              System.out.print((char) buf.get());
63          }
64          System.out.flush();
65      }
66  }