WorldClockServerHandler Class — netty Architecture

Source Code

example/src/main/java/io/netty/example/worldclock/WorldClockServerHandler.java lines 32–72

public class WorldClockServerHandler extends SimpleChannelInboundHandler<Locations> {

    @Override
    public void channelRead0(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) {
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ctx.close();
    }

    private static String toString(Continent c) {
        return c.name().charAt(0) + c.name().toLowerCase().substring(1);
    }
}