Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>ok, here's an attempt at using ScheduledExecutorService. I'm impressed by the performance; I ran the test program with arguments 50 1 10 (50msec timeout; every 1msec the ResettableTimer is reset 10 times) and it uses virtually none of my CPU.</p> <pre><code>package com.example.test; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.ScheduledFuture; import java.util.concurrent.ScheduledThreadPoolExecutor; import java.util.concurrent.TimeUnit; import java.util.concurrent.atomic.AtomicReference; public class ResettableTimer { final private ScheduledExecutorService scheduler; final private long timeout; final private TimeUnit timeUnit; final private Runnable task; final private AtomicReference&lt;ScheduledFuture&lt;?&gt;&gt; ticket = new AtomicReference&lt;ScheduledFuture&lt;?&gt;&gt;(); /* use AtomicReference to manage concurrency * in case reset() gets called from different threads */ public ResettableTimer(ScheduledExecutorService scheduler, long timeout, TimeUnit timeUnit, Runnable task) { this.scheduler = scheduler; this.timeout = timeout; this.timeUnit = timeUnit; this.task = task; } public ResettableTimer reset(boolean mayInterruptIfRunning) { /* * in with the new, out with the old; * this may mean that more than 1 task is scheduled at once for a short time, * but that's not a big deal and avoids some complexity in this code */ ScheduledFuture&lt;?&gt; newTicket = this.scheduler.schedule( this.task, this.timeout, this.timeUnit); ScheduledFuture&lt;?&gt; oldTicket = this.ticket.getAndSet(newTicket); if (oldTicket != null) { oldTicket.cancel(mayInterruptIfRunning); } return this; } static public void main(String[] args) { if (args.length &gt;= 3) { int timeout = Integer.parseInt(args[0]); int period = Integer.parseInt(args[1]); final int nresetsPerPeriod = Integer.parseInt(args[2]); ScheduledExecutorService scheduler = new ScheduledThreadPoolExecutor(1); final ResettableTimer timer = new ResettableTimer(scheduler, timeout, TimeUnit.MILLISECONDS, new Runnable() { public void run() { System.out.println("timeout!"); } } ); // start a separate thread pool for resetting new ScheduledThreadPoolExecutor(5).scheduleAtFixedRate(new Runnable() { private int runCounter = 0; public void run() { for (int i = 0; i &lt; nresetsPerPeriod; ++i) { timer.reset(false); } if ((++this.runCounter % 100) == 0) { System.out.println("runCounter: "+this.runCounter); } } }, 0, period, TimeUnit.MILLISECONDS); try { while (true) { Thread.sleep(1000); } } catch (InterruptedException e) { System.out.println("interrupted!"); } } } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POresettable timeout in Java
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USJason S
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

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