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    1   /*
    2    * Copyright 2012 The Netty Project
    3    *
    4    * The Netty Project licenses this file to you under the Apache License,
    5    * version 2.0 (the "License"); you may not use this file except in compliance
    6    * with the License. You may obtain a copy of the License at:
    7    *
    8    *   http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    13   * License for the specific language governing permissions and limitations
    14   * under the License.
    15   */
    16  package org.jboss.netty.example.objectecho;
    17
    18  import java.util.ArrayList;
    19  import java.util.List;
    20  import java.util.concurrent.atomic.AtomicLong;
    21  import java.util.logging.Level;
    22  import java.util.logging.Logger;
    23
    24  import org.jboss.netty.channel.ChannelEvent;
    25  import org.jboss.netty.channel.ChannelHandlerContext;
    26  import org.jboss.netty.channel.ChannelState;
    27  import org.jboss.netty.channel.ChannelStateEvent;
    28  import org.jboss.netty.channel.ExceptionEvent;
    29  import org.jboss.netty.channel.MessageEvent;
    30  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
    31
    32  /**
    33   * Handler implementation for the object echo client.  It initiates the
    34   * ping-pong traffic between the object echo client and server by sending the
    35   * first message to the server.
    36   */
    37  public class ObjectEchoClientHandler extends SimpleChannelUpstreamHandler {
    38
    39      private static final Logger logger = Logger.getLogger(
    40              ObjectEchoClientHandler.class.getName());
    41
    42      private final List<Integer> firstMessage;
    43      private final AtomicLong transferredMessages = new AtomicLong();
    44
    45      /**
    46       * Creates a client-side handler.
    47       */
    48      public ObjectEchoClientHandler(int firstMessageSize) {
    49          if (firstMessageSize <= 0) {
    50              throw new IllegalArgumentException(
    51                      "firstMessageSize: " + firstMessageSize);
    52          }
    53          firstMessage = new ArrayList<Integer>(firstMessageSize);
    54          for (int i = 0; i < firstMessageSize; i ++) {
    55              firstMessage.add(i);
    56          }
    57      }
    58
    59      public long getTransferredMessages() {
    60          return transferredMessages.get();
    61      }
    62
    63      @Override
    64      public void handleUpstream(
    65              ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
    66          if (e instanceof ChannelStateEvent &&
    67              ((ChannelStateEvent) e).getState() != ChannelState.INTEREST_OPS) {
    68              logger.info(e.toString());
    69          }
    70          super.handleUpstream(ctx, e);
    71      }
    72
    73      @Override
    74      public void channelConnected(
    75              ChannelHandlerContext ctx, ChannelStateEvent e) {
    76          // Send the first message if this handler is a client-side handler.
    77          e.getChannel().write(firstMessage);
    78      }
    79
    80      @Override
    81      public void messageReceived(
    82              ChannelHandlerContext ctx, MessageEvent e) {
    83          // Echo back the received object to the server.
    84          transferredMessages.incrementAndGet();
    85          e.getChannel().write(e.getMessage());
    86      }
    87
    88      @Override
    89      public void exceptionCaught(
    90              ChannelHandlerContext ctx, ExceptionEvent e) {
    91          logger.log(
    92                  Level.WARNING,
    93                  "Unexpected exception from downstream.",
    94                  e.getCause());
    95          e.getChannel().close();
    96      }
    97  }