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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  }