Examples of java.util.concurrent.CancellationException

java.util.concurrent.CancellationException
Exception indicating that the result of a value-producing task, such as a {@link FutureTask}, cannot be retrieved because the task was cancelled. @since 1.5 @author Doug Lea

      }
      
      private V innerGet(long timeout, TimeUnit unit)
            throws ExecutionException, TimeoutException, InterruptedException {
         if (isCancelled())
            throw new CancellationException("Task already cancelled");


         long timeoutNanos = computeTimeoutNanos(timeout, unit);
         long endNanos = System.nanoTime() + timeoutNanos;
         V response;
         try {

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    public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {


      ArrayBlockingQueue<Object> localRQ = resultQueue;


      if (state.get() == CANCELED)
        throw new CancellationException();


      if (localRQ == null && state.get() == ADDED)
        throw new IllegalStateException("Tried to get result twice");


      Object r = localRQ.poll(timeout, unit);


      // could have been canceled while waiting
      if (state.get() == CANCELED) {
        if (r != null)
          throw new IllegalStateException("Nothing should have been added when in canceled state");


        throw new CancellationException();
      }


      if (r == null)
        throw new TimeoutException();

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    @Override
    public boolean cancel(boolean mayInterruptIfRunning) {


        LOG.debug("Attempting to cancel");


        CancellationException ce = null;
        synchronized (latch) {
            if (!isCancelled() && !isDone() && cancelOwner(mayInterruptIfRunning)) {


                LOG.debug("Successfully cancelled");


                ce = new CancellationException();
                result.set(ce);
            } else {
                LOG.debug("Unable to cancel");
            }

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        LOG.trace("Entering wait");
        latch.await();
        LOG.trace("Wait completed");


        if (isCancelled()) {
            throw new CancellationException();
        }


        Object object = result.get();


        if (object instanceof ExecutionException) {

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        }


        LOG.trace("Wait completed");


        if (isCancelled()) {
            throw new CancellationException();
        }


        Object object = result.get();


        if (object instanceof ExecutionException) {

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            if (clearList) {
                tilesToDraw_queue.clear(); 
            }
            
            throw new CancellationException();
        }
    }

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    @Override
    public void run() {
      MapMakerInternalMap<?, ?> map = mapReference.get();
      if (map == null) {
        throw new CancellationException();
      }


      for (Segment<?, ?> segment : map.segments) {
        segment.runCleanup();
      }

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                // Wait for removal to complete
                while (map.containsKey(name)) try {
                    map.wait();
                } catch (InterruptedException ex) {
                    Thread.currentThread().interrupt();
                    throw new CancellationException("Service install was cancelled");
                }
                boolean intr = false;
                try {
                    while (map.containsKey(name)) try {
                        map.wait();
                        return realBuilder.install();
                    } catch (InterruptedException e) {
                        if (respectInterruption) {
                            Thread.currentThread().interrupt();
                            throw new CancellationException("Service install was cancelled");
                        } else {
                            intr = true;
                        }
                    }
                } finally {

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            try {
                modelController.acquireLock(respectInterruption);
                lockDepth = depth;
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
                throw new CancellationException("Operation cancelled asynchronously");
            }
        }
    }

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    private void awaitContainerMonitor() {
        try {
            modelController.awaitContainerMonitor(respectInterruption, 1);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            throw new CancellationException("Operation cancelled asynchronously");
        }
    }

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