Examples of artofillusion.util.ThreadManager

artofillusion.util.ThreadManager
This class coordinates threads for multi-threaded operations. The execution model provided by this class is a single "task" (e.g. tracing a ray through a single pixel) which must be executed many times. The task is parameterized by a single index (e.g. the column containing the pixel).
To use this class, pass it an object which implements the Task interface. It automatically creates an appropriate number of threads based on the number of available processors. When you call run(), the task is repeatedly executed by the worker threads, with the index running over the desired range. You may invoke run() any number of times (e.g. once for each row of the image). Finally, call finish() to clean up the worker threads.

  {
    final AtomicBoolean flags[] = new AtomicBoolean[1000];
    for (int i = 0; i < flags.length; i++)
      flags[i] = new AtomicBoolean();
    final AtomicBoolean error = new AtomicBoolean();
    ThreadManager tm = new ThreadManager(flags.length, new artofillusion.util.ThreadManager.Task()
    {
      public void execute(int index)
      {
        if (flags[index].get())
          error.set(true);
        flags[index].set(true);
      }
      public void cleanup()
      {
      }
    });
    for (int repeat = 0; repeat < 50; repeat++)
    {
      for (int i = 0; i < flags.length; i++)
        flags[i].set(false);
      error.set(false);
      tm.run();
      assertFalse(error.get());
      for (int i = 0; i < flags.length; i++)
        assertTrue(flags[i].get());
    }
  }

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  public void testCancel()
  {
    final AtomicBoolean canceled = new AtomicBoolean();
    final AtomicInteger errorCount = new AtomicInteger();
    final ThreadManager tm = new ThreadManager();
    tm.setNumIndices(1000);
    tm.setTask(new ThreadManager.Task()
    {
      public void execute(int index)
      {
        if (canceled.get())
          errorCount.incrementAndGet();
        if (index == 500)
        {
          tm.cancel();
          canceled.set(true);
        }
      }
      public void cleanup()
      {
      }
    });
    for (int repeat = 0; repeat < 50; repeat++)
    {
      canceled.set(false);
      errorCount.set(0);
      tm.run();
      assertTrue(errorCount.get() < Runtime.getRuntime().availableProcessors());
    }
  }

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Related Classes of artofillusion.util.ThreadManager

artofillusion.TestThreadManager

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