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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  }