/*
* (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 <wq163@163.com> , boyan <killme2008@gmail.com>
*/
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;
}
}