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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.netty.example.worldclock;
  
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.SimpleChannelInboundHandler;
  import io.netty.example.worldclock.WorldClockProtocol.Continent;
  import io.netty.example.worldclock.WorldClockProtocol.LocalTime;
  import io.netty.example.worldclock.WorldClockProtocol.LocalTimes;
  import io.netty.example.worldclock.WorldClockProtocol.Location;
  import io.netty.example.worldclock.WorldClockProtocol.Locations;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Formatter;
  import java.util.List;
  import java.util.concurrent.BlockingQueue;
  import java.util.concurrent.LinkedBlockingQueue;
  import java.util.regex.Pattern;
  
  public class WorldClockClientHandler extends SimpleChannelInboundHandler<LocalTimes> {
  
      private static final Pattern DELIM = Pattern.compile("/");
  
      // Stateful properties
      private volatile Channel channel;
      private final BlockingQueue<LocalTimes> answer = new LinkedBlockingQueue<LocalTimes>();
  
      public WorldClockClientHandler() {
          super(false);
      }
  
      public List<String> getLocalTimes(Collection<String> cities) {
          Locations.Builder builder = Locations.newBuilder();
  
          for (String c: cities) {
              String[] components = DELIM.split(c);
              builder.addLocation(Location.newBuilder().
                  setContinent(Continent.valueOf(components[0].toUpperCase())).
                  setCity(components[1]).build());
          }
  
          channel.writeAndFlush(builder.build());
  
          LocalTimes localTimes;
          boolean interrupted = false;
          for (;;) {
              try {
                  localTimes = answer.take();
                  break;
              } catch (InterruptedException ignore) {
                  interrupted = true;
              }
          }
  
          if (interrupted) {
              Thread.currentThread().interrupt();
          }
  
          List<String> result = new ArrayList<String>();
          for (LocalTime lt: localTimes.getLocalTimeList()) {
              result.add(
                      new Formatter().format(
                              "%4d-%02d-%02d %02d:%02d:%02d %s",
                              lt.getYear(),
                              lt.getMonth(),
                              lt.getDayOfMonth(),
                              lt.getHour(),
                              lt.getMinute(),
                              lt.getSecond(),
                              lt.getDayOfWeek().name()).toString());
          }
  
          return result;
      }
  
      @Override
      public void channelRegistered(ChannelHandlerContext ctx) {
          channel = ctx.channel();
      }
  
      @Override
      public void channelRead0(ChannelHandlerContext ctx, LocalTimes times) throws Exception {
          answer.add(times);
      }
 
     @Override
     public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
         cause.printStackTrace();
         ctx.close();
     }
 }