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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.core.service.IoHandler;
23  import org.apache.mina.core.service.IoHandlerAdapter;
24  import org.apache.mina.core.session.IoSession;
25  import org.apache.mina.example.sumup.message.AddMessage;
26  import org.apache.mina.example.sumup.message.ResultMessage;
27  import org.slf4j.Logger;
28  import org.slf4j.LoggerFactory;
29  
30  /**
31   * {@link IoHandler} for SumUp client.
32   *
33   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
34   */
35  public class ClientSessionHandler extends IoHandlerAdapter {
36  
37      private final static Logger LOGGER = LoggerFactory.getLogger(ClientSessionHandler.class);
38      
39      private final int[] values;
40  
41      private boolean finished;
42  
43      public ClientSessionHandler(int[] values) {
44          this.values = values;
45      }
46  
47      public boolean isFinished() {
48          return finished;
49      }
50  
51      @Override
52      public void sessionOpened(IoSession session) {
53          // send summation requests
54          for (int i = 0; i < values.length; i++) {
55              AddMessage m = new AddMessage();
56              m.setSequence(i);
57              m.setValue(values[i]);
58              session.write(m);
59          }
60      }
61  
62      @Override
63      public void messageReceived(IoSession session, Object message) {
64          // server only sends ResultMessage. otherwise, we will have to identify
65          // its type using instanceof operator.
66          ResultMessage rm = (ResultMessage) message;
67          if (rm.isOk()) {
68              // server returned OK code.
69              // if received the result message which has the last sequence
70              // number,
71              // it is time to disconnect.
72              if (rm.getSequence() == values.length - 1) {
73                  // print the sum and disconnect.
74                  LOGGER.info("The sum: " + rm.getValue());
75                  session.close(true);
76                  finished = true;
77              }
78          } else {
79              // seever returned error code because of overflow, etc.
80              LOGGER.warn("Server error, disconnecting...");
81              session.close(true);
82              finished = true;
83          }
84      }
85  
86      @Override
87      public void exceptionCaught(IoSession session, Throwable cause) {
88          session.close(true);
89      }
90  }