SimpleRecurringEventTimer.java revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* ident "%Z%%M% %I% %E% SMI"
*/
package com.sun.solaris.service.timer;
/**
* A recurring event timer. Like all Java time consumers, which rely on
* wall time, adjustments to the time of day will adversely affect the
* accuracy of the period.
*/
public class SimpleRecurringEventTimer implements RecurringEventTimer
{
/**
* Next time the event is to occur.
*/
private long nextFiring;
/**
* Period between recurrences of the event, in milliseconds.
*/
private long period;
/**
* Multiplier to convert seconds to milliseconds.
*/
public static final int SEC = 1000;
/**
* Establishes a timer which will fire every 'period'
* milliseconds starting from now.
*/
public SimpleRecurringEventTimer(long period)
{
this.period = period;
nextFiring = System.currentTimeMillis() + period;
}
/**
* Cause the current thread to wait until at least the time of
* the next event, as near as possible, unless interrupted.
*
* @throws InterruptedException if the thread is interrupted
* while waiting for the next firing. Subsequent calls to this
* method will wait for the same firing.
*/
public void waitUntilNextFiring() throws InterruptedException
{
long delta;
while ((delta = nextFiring - System.currentTimeMillis()) > 0)
Thread.sleep(delta);
nextFiring += period;
}
}