Databases
StackOverflow2013
Postsdbo
POresettable timeout in Java
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POresettable timeout in Java
    primarykey
    data
    text
    <p>(similar to <a href="https://stackoverflow.com/questions/32001/resettable-java-timer">"Resettable Java Timer"</a> but there are some subtleties I need to explore)</p> <p>I need a resettable timeout feature, so that if my class does not perform a particular action within an interval of time T0 (where T0 is in the neighborhood of 50-1000msec), then a method gets called:</p> <pre><code>class MyClass { static final private timeoutTime = 50; final private SomeTimer timer = new SomeTimer(timeoutTime, new Runnable () { public void run() { onTimeout(); }}); private void onTimeout() { /* do something on timeout */ } public void criticalMethod() { this.timer.reset(); } } </code></pre> <p>What can I use to implement this? I'm familiar with <a href="http://java.sun.com/javase/6/docs/api/java/util/concurrent/ScheduledExecutorService.html" rel="nofollow noreferrer">ScheduledExecutorService</a>, and the idea of calling <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/util/concurrent/Future.html#cancel%28boolean%29" rel="nofollow noreferrer">ScheduledFuture.cancel()</a> and then rescheduling the task <em>seems</em> like it should work, but then there's a potential hazard if cancel() fails and the scheduled task executes when it shouldn't. I feel like I'm missing a subtlety here.</p> <p>Also (perhaps more importantly), is there a way to test my implementation / prove that it works properly?</p> <p><strong>edit:</strong> I am particularly concerned about the case where <code>criticalMethod()</code> gets called often (perhaps several times per millisecond)... if I use ScheduledExecutorService, it just seems like a potential resource problem to keep creating new scheduled tasks + canceling old ones, rather than having a direct way to reschedule a task.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USJason S
    plurals
    1. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POresettable timeout in Java
      1. USJason Nichols
      1. VTFavorite
    2. VO
      singulars
      1. POresettable timeout in Java
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POresettable timeout in Java
      1. This table or related slice is empty.
      1. VTUpMod
    1. COAs a final addendum to my answer, you definitely should read through Java Concurrency in Practice if you haven't already. All the ideas in my answer came from that book (or personal experience, but the book matches up with my experiences).
      singulars
      1. POresettable timeout in Java
      1. USChris Jester-Young
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload