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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.sumup;
21  
22  import org.apache.mina.common.IoHandler;
23  import org.apache.mina.common.IoHandlerAdapter;
24  import org.apache.mina.common.IoSession;
25  import org.apache.mina.example.sumup.message.AddMessage;
26  import org.apache.mina.example.sumup.message.ResultMessage;
27  import org.apache.mina.util.SessionLog;
28  
29  /**
30   * {@link IoHandler} for SumUp client.
31   * 
32   * @author The Apache Directory Project (mina-dev@directory.apache.org)
33   * @version $Rev: 555855 $, $Date: 2007-07-13 05:19:00 +0200 (Fri, 13 Jul 2007) $
34   */
35  public class ClientSessionHandler extends IoHandlerAdapter {
36      private final int[] values;
37  
38      private boolean finished;
39  
40      public ClientSessionHandler(int[] values) {
41          this.values = values;
42      }
43  
44      public boolean isFinished() {
45          return finished;
46      }
47  
48      public void sessionOpened(IoSession session) {
49          // send summation requests
50          for (int i = 0; i < values.length; i++) {
51              AddMessage m = new AddMessage();
52              m.setSequence(i);
53              m.setValue(values[i]);
54              session.write(m);
55          }
56      }
57  
58      public void messageReceived(IoSession session, Object message) {
59          // server only sends ResultMessage. otherwise, we will have to identify
60          // its type using instanceof operator.
61          ResultMessage rm = (ResultMessage) message;
62          if (rm.isOk()) {
63              // server returned OK code.
64              // if received the result message which has the last sequence
65              // number,
66              // it is time to disconnect.
67              if (rm.getSequence() == values.length - 1) {
68                  // print the sum and disconnect.
69                  SessionLog.info(session, "The sum: " + rm.getValue());
70                  session.close();
71                  finished = true;
72              }
73          } else {
74              // seever returned error code because of overflow, etc.
75              SessionLog.warn(session, "Server error, disconnecting...");
76              session.close();
77              finished = true;
78          }
79      }
80  
81      public void exceptionCaught(IoSession session, Throwable cause) {
82          session.close();
83      }
84  }