/*
* 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:
*
* http://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.ChannelInboundMessageHandlerAdapter;
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.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Pattern;
public class WorldClockClientHandler extends ChannelInboundMessageHandlerAdapter<LocalTimes> {
private static final Logger logger = Logger.getLogger(
WorldClockClientHandler.class.getName());
private static final Pattern DELIM = Pattern.compile("/");
// Stateful properties
private volatile Channel channel;
private final BlockingQueue<LocalTimes> answer = new LinkedBlockingQueue<LocalTimes>();
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.write(builder.build());
LocalTimes localTimes;
boolean interrupted = false;
for (;;) {
try {
localTimes = answer.take();
break;
} catch (InterruptedException e) {
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) throws Exception {
channel = ctx.channel();
}
@Override
public void messageReceived(ChannelHandlerContext ctx, LocalTimes msg) throws Exception {
answer.add(msg);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
logger.log(
Level.WARNING,
"Unexpected exception from downstream.", cause);
ctx.close();
}
}