Examples of java.util.concurrent.FutureTask

java.util.concurrent.FutureTask
A cancellable asynchronous computation. This class provides a base implementation of {@link Future}, with methods to start and cancel a computation, query to see if the computation is complete, and retrieve the result of the computation. The result can only be retrieved when the computation has completed; the {@code get}methods will block if the computation has not yet completed. Once the computation has completed, the computation cannot be restarted or cancelled (unless the computation is invoked using {@link #runAndReset}).
A {@code FutureTask} can be used to wrap a {@link Callable} or{@link Runnable} object. Because {@code FutureTask} implements{@code Runnable}, a {@code FutureTask} can be submitted to an{@link Executor} for execution.
In addition to serving as a standalone class, this class provides {@code protected} functionality that may be useful when creatingcustomized task classes. @since 1.5 @author Doug Lea @param < V> The result type returned by this FutureTask's {@code get} methods

   * @param runnable
   *            The Runnable that has to be called on JFX thread.
   */
  static public void runAndWait(final Runnable runnable) {
    try {
      FutureTask future = new FutureTask(runnable, null);
      Platform.runLater(future);
      future.get();
    }
    catch (InterruptedException | ExecutionException e) {
      throw new RuntimeException(e);
    }
  }

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            _oneInstance),


            _timeout);


         _futureResult = new FutureTask(_callable);
         return _futureResult;
         
      }
      catch (Exception e)
      {

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   }


   public Object call() throws Exception
   {


      FutureTask result = new FutureTask(function);




      Thread thread = Executors.defaultThreadFactory().newThread(result);


      thread.start();


      try
      {


         startingTime = System.currentTimeMillis();


         Object obj = result.get(millis, TimeUnit.MILLISECONDS);


         endingTime = System.currentTimeMillis();


         return obj;

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     */


    @SuppressWarnings("unchecked")
    public CallbackFuture(InvocationContext ic, AsyncHandler handler) {
        cft = new CallbackFutureTask(ic.getAsyncResponseListener(), handler);
        task = new FutureTask(cft);
        executor = ic.getExecutor();
        
        /*
         * TODO review.  We need to save the invocation context so we can set it on the
         * response (or fault) context so the FutureCallback has access to the handler list.

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        synchronized (tasks)
        {
            Iterator<FutureTask> taskIterator = tasks.iterator();
            while (taskIterator.hasNext())
            {
                FutureTask task = taskIterator.next();
                task.cancel(true);
            }
            tasks.clear();
        }
    }

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     * @throws QueryInterruptedException if the operation is cancelled (by the user in another thread)
     */
    protected Object performExecuteTask(final Object... args)
    {
        Integer timeout = getTimeoutMillis();
        FutureTask theTask = null;
        final Object[] threadResults = new Object[1];
        try
        {
            // Execute the query in its own thread so we can time it out
            theTask = new FutureTask(new Runnable()
            {
                public void run()
                {
                    threadResults[0] = performExecuteInternal(args);
                }
            }, null);
            tasks.add(theTask);


            // start task in a new thread
            if (NucleusLogger.QUERY.isDebugEnabled())
            {
                if (timeout != null && timeout > 0)
                {
                    NucleusLogger.QUERY.debug(LOCALISER.msg("021019", toString(), timeout));
                }
                else
                {
                    NucleusLogger.QUERY.debug(LOCALISER.msg("021022", toString()));
                }
            }
            new Thread(theTask).start();


            // wait for the execution to finish, timeout after the users limit is exceeded if required
            if (timeout != null && timeout > 0)
            {
                theTask.get(timeout, TimeUnit.MILLISECONDS);
            }
            else
            {
                theTask.get();
            }
            tasks.remove(theTask);
        }
        catch (TimeoutException e)
        {

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     * @param results The results
     * @return The query task
     */
    protected FutureTask getPerformExecuteTask(final Map parameters, final Object[] results)
    {
        FutureTask theTask = new FutureTask(new Runnable()
        {
            public void run()
            {
                results[0] = performExecute(parameters);
            }

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      return recvBuf;
    }


    ExecutorService executor = Executors.newSingleThreadExecutor();
    MultiFetch multiFetch = new MultiFetch();
    FutureTask<?> task = new FutureTask(multiFetch, null);
    executor.execute(task);
    try {
      task.get(fetchTimeoutSeconds, TimeUnit.SECONDS);
    } catch(InterruptedException ie) {
      // attempt to cancel execution of the task.
      task.cancel(true);
      LOG.error("interrupted during fetch: "+ie.toString());
    } catch(ExecutionException ee) {
      // attempt to cancel execution of the task.
      task.cancel(true);
      LOG.error("exception during fetch: "+ee.toString());
    } catch(TimeoutException te) {
      // attempt to cancel execution of the task.  
      task.cancel(true);
      LOG.error("timeout for fetch: "+te.toString());
    }


    executor.shutdownNow();
    multiFetch.close();

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