Java tutorial
/* * 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 com.hxr.javatone.concurrency.netty.official.worldclock; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; import com.hxr.javatone.concurrency.netty.official.worldclock.WorldClockProtocol.Continent; import com.hxr.javatone.concurrency.netty.official.worldclock.WorldClockProtocol.DayOfWeek; import com.hxr.javatone.concurrency.netty.official.worldclock.WorldClockProtocol.LocalTime; import com.hxr.javatone.concurrency.netty.official.worldclock.WorldClockProtocol.LocalTimes; import com.hxr.javatone.concurrency.netty.official.worldclock.WorldClockProtocol.Location; import com.hxr.javatone.concurrency.netty.official.worldclock.WorldClockProtocol.Locations; import java.util.Calendar; import java.util.TimeZone; import java.util.logging.Level; import java.util.logging.Logger; import static java.util.Calendar.*; public class WorldClockServerHandler extends SimpleChannelInboundHandler<Locations> { private static final Logger logger = Logger.getLogger(WorldClockServerHandler.class.getName()); @Override public void messageReceived(ChannelHandlerContext ctx, Locations locations) throws Exception { long currentTime = System.currentTimeMillis(); LocalTimes.Builder builder = LocalTimes.newBuilder(); for (Location l : locations.getLocationList()) { TimeZone tz = TimeZone.getTimeZone(toString(l.getContinent()) + '/' + l.getCity()); Calendar calendar = getInstance(tz); calendar.setTimeInMillis(currentTime); builder.addLocalTime(LocalTime.newBuilder().setYear(calendar.get(YEAR)) .setMonth(calendar.get(MONTH) + 1).setDayOfMonth(calendar.get(DAY_OF_MONTH)) .setDayOfWeek(DayOfWeek.valueOf(calendar.get(DAY_OF_WEEK))).setHour(calendar.get(HOUR_OF_DAY)) .setMinute(calendar.get(MINUTE)).setSecond(calendar.get(SECOND)).build()); } ctx.write(builder.build()); } @Override public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { ctx.flush(); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { logger.log(Level.WARNING, "Unexpected exception from downstream.", cause); ctx.close(); } private static String toString(Continent c) { return c.name().charAt(0) + c.name().toLowerCase().substring(1); } }