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1   /*
2    * Copyright 2009 Red Hat, Inc.
3    *
4    * Red Hat licenses this file to you under the Apache License, version 2.0
5    * (the "License"); you may not use this file except in compliance with the
6    * 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  /**
41   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
42   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
43   *
44   * @version $Rev: 2190 $, $Date: 2010-02-19 18:08:01 +0900 (Fri, 19 Feb 2010) $
45   */
46  public class LocalTimeClientHandler extends SimpleChannelUpstreamHandler {
47  
48      private static final Logger logger = Logger.getLogger(
49              LocalTimeClientHandler.class.getName());
50  
51      // Stateful properties
52      private volatile Channel channel;
53      private final BlockingQueue<LocalTimes> answer = new LinkedBlockingQueue<LocalTimes>();
54  
55      public List<String> getLocalTimes(Collection<String> cities) {
56          Locations.Builder builder = Locations.newBuilder();
57  
58          for (String c: cities) {
59              String[] components = c.split("/");
60              builder.addLocation(Location.newBuilder().
61                  setContinent(Continent.valueOf(components[0].toUpperCase())).
62                  setCity(components[1]).build());
63          }
64  
65          channel.write(builder.build());
66  
67          LocalTimes localTimes;
68          boolean interrupted = false;
69          for (;;) {
70              try {
71                  localTimes = answer.take();
72                  break;
73              } catch (InterruptedException e) {
74                  interrupted = true;
75              }
76          }
77  
78          if (interrupted) {
79              Thread.currentThread().interrupt();
80          }
81  
82          List<String> result = new ArrayList<String>();
83          for (LocalTime lt: localTimes.getLocalTimeList()) {
84              result.add(
85                      new Formatter().format(
86                              "%4d-%02d-%02d %02d:%02d:%02d %s",
87                              lt.getYear(),
88                              lt.getMonth(),
89                              lt.getDayOfMonth(),
90                              lt.getHour(),
91                              lt.getMinute(),
92                              lt.getSecond(),
93                              lt.getDayOfWeek().name()).toString());
94          }
95  
96          return result;
97      }
98  
99      @Override
100     public void handleUpstream(
101             ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
102         if (e instanceof ChannelStateEvent) {
103             logger.info(e.toString());
104         }
105         super.handleUpstream(ctx, e);
106     }
107 
108     @Override
109     public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent e)
110             throws Exception {
111         channel = e.getChannel();
112         super.channelOpen(ctx, e);
113     }
114 
115     @Override
116     public void messageReceived(
117             ChannelHandlerContext ctx, final MessageEvent e) {
118         boolean offered = answer.offer((LocalTimes) e.getMessage());
119         assert offered;
120     }
121 
122     @Override
123     public void exceptionCaught(
124             ChannelHandlerContext ctx, ExceptionEvent e) {
125         logger.log(
126                 Level.WARNING,
127                 "Unexpected exception from downstream.",
128                 e.getCause());
129         e.getChannel().close();
130     }
131 }