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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.localtime;
    17
    18  import java.util.ArrayList;
    19  import java.util.Collection;
    20  import java.util.Formatter;
    21  import java.util.List;
    22  import java.util.concurrent.BlockingQueue;
    23  import java.util.concurrent.LinkedBlockingQueue;
    24  import java.util.logging.Level;
    25  import java.util.logging.Logger;
    26
    27  import org.jboss.netty.channel.Channel;
    28  import org.jboss.netty.channel.ChannelEvent;
    29  import org.jboss.netty.channel.ChannelHandlerContext;
    30  import org.jboss.netty.channel.ChannelStateEvent;
    31  import org.jboss.netty.channel.ExceptionEvent;
    32  import org.jboss.netty.channel.MessageEvent;
    33  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
    34  import org.jboss.netty.example.localtime.LocalTimeProtocol.Continent;
    35  import org.jboss.netty.example.localtime.LocalTimeProtocol.LocalTime;
    36  import org.jboss.netty.example.localtime.LocalTimeProtocol.LocalTimes;
    37  import org.jboss.netty.example.localtime.LocalTimeProtocol.Location;
    38  import org.jboss.netty.example.localtime.LocalTimeProtocol.Locations;
    39
    40  public class LocalTimeClientHandler extends SimpleChannelUpstreamHandler {
    41
    42      private static final Logger logger = Logger.getLogger(
    43              LocalTimeClientHandler.class.getName());
    44
    45      // Stateful properties
    46      private volatile Channel channel;
    47      private final BlockingQueue<LocalTimes> answer = new LinkedBlockingQueue<LocalTimes>();
    48
    49      public List<String> getLocalTimes(Collection<String> cities) {
    50          Locations.Builder builder = Locations.newBuilder();
    51
    52          for (String c: cities) {
    53              String[] components = c.split("/");
    54              builder.addLocation(Location.newBuilder().
    55                  setContinent(Continent.valueOf(components[0].toUpperCase())).
    56                  setCity(components[1]).build());
    57          }
    58
    59          channel.write(builder.build());
    60
    61          LocalTimes localTimes;
    62          boolean interrupted = false;
    63          for (;;) {
    64              try {
    65                  localTimes = answer.take();
    66                  break;
    67              } catch (InterruptedException e) {
    68                  interrupted = true;
    69              }
    70          }
    71
    72          if (interrupted) {
    73              Thread.currentThread().interrupt();
    74          }
    75
    76          List<String> result = new ArrayList<String>();
    77          for (LocalTime lt: localTimes.getLocalTimeList()) {
    78              result.add(
    79                      new Formatter().format(
    80                              "%4d-%02d-%02d %02d:%02d:%02d %s",
    81                              lt.getYear(),
    82                              lt.getMonth(),
    83                              lt.getDayOfMonth(),
    84                              lt.getHour(),
    85                              lt.getMinute(),
    86                              lt.getSecond(),
    87                              lt.getDayOfWeek().name()).toString());
    88          }
    89
    90          return result;
    91      }
    92
    93      @Override
    94      public void handleUpstream(
    95              ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
    96          if (e instanceof ChannelStateEvent) {
    97              logger.info(e.toString());
    98          }
    99          super.handleUpstream(ctx, e);
    100     }
    101
    102     @Override
    103     public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent e)
    104             throws Exception {
    105         channel = e.getChannel();
    106         super.channelOpen(ctx, e);
    107     }
    108
    109     @Override
    110     public void messageReceived(
    111             ChannelHandlerContext ctx, final MessageEvent e) {
    112         boolean offered = answer.offer((LocalTimes) e.getMessage());
    113         assert offered;
    114     }
    115
    116     @Override
    117     public void exceptionCaught(
    118             ChannelHandlerContext ctx, ExceptionEvent e) {
    119         logger.log(
    120                 Level.WARNING,
    121                 "Unexpected exception from downstream.",
    122                 e.getCause());
    123         e.getChannel().close();
    124     }
    125 }