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/*
 * (C) 2007-2012 Alibaba Group Holding Limited.
 * 
 * Licensed 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.
 * Authors:
 *   wuhua  , boyan 
 */
package com.taobao.metamorphosis.server.utils;

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;


/**
 * ϵͳʱ?仺??
 * 
 * @author boyan
 * @Date 2010-9-28
 * 
 */
public class SystemTimer {
    private final static ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();

    private static final long tickUnit = Long.parseLong(System.getProperty("notify.systimer.tick", "50"));

    static {
        executor.scheduleAtFixedRate(new TimerTicker(), tickUnit, tickUnit, TimeUnit.MILLISECONDS);
        Runtime.getRuntime().addShutdownHook(new Thread() {
            @Override
            public void run() {
                executor.shutdown();
            }
        });
    }

    private static volatile long time = System.currentTimeMillis();

    private static class TimerTicker implements Runnable {
        public void run() {
            time = System.currentTimeMillis();
        }
    }


    public static long currentTimeMillis() {
        return time;
    }

}