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| package com.glaurent.utils;
/**
* The CountDown class implements a count down features.
* @author glaurent
*/
public class CountDown extends Thread {
/** Remaining time before the CountDown is over (in milliseconds). */
private long _delay;
/** Action to launch every second (round second). */
private CountDownAction _ticAction;
/** Action to launch when the CountDown reaches zero. */
private CountDownAction _lastAction;
/** Indicates if the CountDown is in pause mode. */
private boolean _pause = false;
/**
* Constructs a CountDown but do not start it.
* @param delay Duration (in seconds) of the CountDown to create.
* @param ticAction Action to launch every second (round second). ticAction should be as quick as possible.
* If it lasts more than a second, and the next tic occurs and the current ticAction is not yet terminated,
* the next ticAction won't be launched. ticAction can be set to null if no action should be launched every
* second.
* There is no guarantee that ticAction will be executed <u>every</u> second.
* Also, tickAction can be launched seeveral times for the same second.
* @param lastAction Action to launch when the CountDown reaches zero. lastAction cannot be set to null.
* @exception IllegalArgumentException Thrown if delay is negative or null or if lastAction is set to null.
*/
public CountDown(int delay, CountDownAction ticAction, CountDownAction lastAction) {
if(delay <= 0) {
throw new IllegalArgumentException("CountDown delay must be stricly positive (here set to " + _delay + "seconds)");
}
if(lastAction == null) {
throw new IllegalArgumentException("CountDown last action must be set (here set to null)");
}
_delay = delay * 1000;
_ticAction = ticAction;
_lastAction = lastAction;
}
/**
* Starts this CountDown. When this CountDown reaches zero, the last action specified when this CountDown
* was constructed will be launched.
*/
public void start() {
super.start();
}
/**
* Pause this CountDown. The CountDown will be resumed when the method unpause() is called.
* If this CountDown is already paused, nothing will occur.
* @see unpause()
*/
public void pause() {
synchronized(this) {
if(!_pause) {
_pause = true;
notify();
}
}
}
/**
* Unpause this CountDown that has been paused by a previous call of the pause() method.
* If this CountDown is not paused, nothing will occur.
* @see pause()
*/
public void unpause() {
synchronized(this) {
if(_pause) {
_pause = false;
notify();
}
}
}
/**
* Interrupts this CountDown. When called, this CountDown cannot be started again.
* To pause this CountDown, use the pause() method instead.
* @see start()
* @see pause()
*/
public void interrupt() {
super.interrupt();
}
/**
* Gets the remaining time (in seconds) before this CountDown reaches zero.
* @return The remaining time (in seconds) of this CountDown.
*/
public int getRemainingTime() {
return Math.round(_delay / 1000f);
}
/**
* Sets the remaining time (in seconds) of this CountDown.
* Setting the remaining time of an interrupted CountDown or a CountDown that have reached zero is useless
* since it cannot be started again.
* This method can be called on a unstarted, started or paused CountDown.
* @param delay The new time remaining time (in seconds) of this CountDown.
*/
public void setRemainingTime(int delay) {
_delay = delay * 1000;
}
/**
* Internal use only!
* This method shouldn't ever be called by an application.
*/
public void run() {
synchronized(this) {
try {
final CountDown cd = this;
Runnable tic = new Runnable() {
public void run() {
synchronized(_ticAction) {
if(isAlive() && !isInterrupted()) {
_ticAction.doAction(cd);
}
}
}
};
long startTime, sleepTime;
Thread ticThread = null;
while(_delay > 0) {
// Count even the "while(_pause)" condition execution time
startTime = System.nanoTime();
// Pauses the thread if in pause mode
while(_pause) {
wait();
// Possible end of pause, reset startTime
startTime = System.nanoTime();
}
sleepTime = _delay % 1000l;
wait((sleepTime == 0l ? 1000l : sleepTime));
// Launch the tic action
if(_ticAction != null && (ticThread == null || !ticThread.isAlive())) {
ticThread = new Thread(tic);
ticThread.start();
}
_delay -= (System.nanoTime() - startTime) / 1000000l;
}
synchronized(_lastAction) {
// Stop the tic action if exists
if(_ticAction != null && ticThread != null) ticThread.interrupt();
// Launch the last action
_lastAction.doAction(this);
}
} catch(InterruptedException ie) {
// Do nothing but simply ends the run method without executing _lastAction
}
}
}
/**
* Unit tests.
* @param args Unused.
*/
public static void main(String[] args) throws Exception {
CountDown count;
CountDownAction tic, last;
System.out.println("Constructing tic action...");
tic = new CountDownAction() {
public void doAction(CountDown cd) {
System.out.println("Tic (remaining " + cd.getRemainingTime() + " secs)");
}
};
System.out.println("Tic action constructed");
System.out.println("Constructing last action...");
last = new CountDownAction() {
public void doAction(CountDown cd) {
System.out.println("Time's up (remaining " + cd.getRemainingTime() + " secs)");
}
};
System.out.println("Last action constructed");
System.out.println("Constructing count down...");
count = new CountDown(10, tic, last);
System.out.println("Count down constructed");
System.out.println("Starting count down...");
count.start();
System.out.println("Count down started");
Thread.sleep(5500);
System.out.println("Pausing count down... (" + count.getRemainingTime() + " seconds remaining)");
count.pause();
System.out.println("Count down paused (" + count.getRemainingTime() + " seconds remaining)");
Thread.sleep(4000);
System.out.println("Pausing count down (again)... (" + count.getRemainingTime() + " seconds remaining)");
count.pause();
System.out.println("Count down paused (again) (" + count.getRemainingTime() + " seconds remaining)");
Thread.sleep(4000);
System.out.println("Unpausing count down... (" + count.getRemainingTime() + " seconds remaining)");
count.unpause();
System.out.println("Count down unpaused (" + count.getRemainingTime() + " seconds remaining)");
}
} |
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