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* java/util/TimerTask.java: New version from Classpath.

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From-SVN: r39801
This commit is contained in:
Mark Wielaard 2001-02-17 15:27:34 +00:00 • committed by Mark Wielaard
parent 3f57b973f3
commit 6483cbecc4
2 changed files with 71 additions and 64 deletions
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131
libjava/java/util/TimerTask.java
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@ -7,7 +7,7 @@ GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
@ -58,74 +58,77 @@ package java.util;
* @since 1.3
* @author Mark Wielaard (mark@klomp.org)
*/
public abstract class TimerTask implements Runnable {
public abstract class TimerTask implements Runnable
{
/**
* If positive the next time this task should be run.
* If negative this TimerTask is canceled or executed for the last time.
*/
long scheduled;
/**
* If positive the next time this task should be run.
* If negative this TimerTask is canceled or executed for the last time.
*/
long scheduled;
/**
* If positive the last time this task was run.
* If negative this TimerTask has not yet been scheduled.
*/
long lastExecutionTime;
/**
* If positive the last time this task was run.
* If negative this TimerTask has not yet been scheduled.
*/
long lastExecutionTime;
/**
* If positive the number of milliseconds between runs of this task.
* If -1 this task doesn't have to be run more then once.
*/
long period;
/**
* If positive the number of milliseconds between runs of this task.
* If -1 this task doesn't have to be run more then once.
*/
long period;
/**
* If true the next time this task should be run is relative to
* the last scheduled time, otherwise it can drift in time.
*/
boolean fixed;
/**
* If true the next time this task should be run is relative to
* the last scheduled time, otherwise it can drift in time.
*/
boolean fixed;
/**
* Creates a TimerTask and marks it as not yet scheduled.
*/
protected TimerTask()
{
this.scheduled = 0;
this.lastExecutionTime = -1;
}
/**
* Creates a TimerTask and marks it as not yet scheduled.
*/
protected TimerTask() {
this.scheduled = 0;
this.lastExecutionTime = -1;
}
/**
* Marks the task as canceled and prevents any further execution.
* Returns true if the task was scheduled for any execution in the future
* and this cancel operation prevents that execution from happening.
* <p>
* A task that has been canceled can never be scheduled again.
* <p>
* In this implementation the TimerTask it is possible that the Timer does
* keep a reference to the TimerTask until the first time the TimerTask
* is actually scheduled. But the reference will disappear immediatly when
* cancel is called from within the TimerTask run method.
*/
public boolean cancel()
{
boolean prevented_execution = (this.scheduled >= 0);
this.scheduled = -1;
return prevented_execution;
}
/**
* Marks the task as canceled and prevents any further execution.
* Returns true if the task was scheduled for any execution in the future
* and this cancel operation prevents that execution from happening.
* <p>
* A task that has been canceled can never be scheduled again.
* <p>
* In this implementation the TimerTask it is possible that the Timer does
* keep a reference to the TimerTask until the first time the TimerTask
* is actually scheduled. But the reference will disappear immediatly when
* cancel is called from within the TimerTask run method.
*/
public boolean cancel() {
boolean prevented_execution = (this.scheduled >= 0);
this.scheduled = -1;
return prevented_execution;
}
/**
* Method that is called when this task is scheduled for execution.
*/
public abstract void run();
/**
* Method that is called when this task is scheduled for execution.
*/
public abstract void run();
/**
* Returns the last time this task was scheduled or (when called by the
* task from the run method) the time the current execution of the task
* was scheduled. When the task has not yet run the return value is
* undefined.
* <p>
* Can be used (when the task is scheduled at fixed rate) to see the
* difference between the requested schedule time and the actual time
* that can be found with <code>System.currentTimeMillis()</code>.
*/
public long scheduledExecutionTime() {
return lastExecutionTime;
}
/**
* Returns the last time this task was scheduled or (when called by the
* task from the run method) the time the current execution of the task
* was scheduled. When the task has not yet run the return value is
* undefined.
* <p>
* Can be used (when the task is scheduled at fixed rate) to see the
* difference between the requested schedule time and the actual time
* that can be found with <code>System.currentTimeMillis()</code>.
*/
public long scheduledExecutionTime()
{
return lastExecutionTime;
}
}