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

    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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    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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            if (null == item) return;
            queue.put(item);
        }
        catch (InterruptedException e)
        {
            throw new CancellationException();
        }
    }

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            {
                slot = queue.poll(ITERATOR_POLL_TIMEOUT, ITERATOR_POLL_TIMEUNIT) ;
            }
            catch (InterruptedException e)
            {
                throw new CancellationException() ;
            }


            if (null != slot)
                break ;

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        {
            queue.put(t) ;
        }
        catch (InterruptedException e)
        {
            throw new CancellationException() ;
        }
    }

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    /**
     * Throws exception, if any, associated with the given status.
     */
    private void reportException(int s) {
        if (s == CANCELLED)
            throw new CancellationException();
        if (s == EXCEPTIONAL)
            rethrow(getThrowableException());
    }

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     * @return the exception, or {@code null} if none
     */
    public final Throwable getException() {
        int s = status & DONE_MASK;
        return ((s >= NORMAL)    ? null :
                (s == CANCELLED) ? new CancellationException() :
                getThrowableException());
    }

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    public final V get() throws InterruptedException, ExecutionException {
        int s = (Thread.currentThread() instanceof ForkJoinWorkerThread) ?
            doJoin() : externalInterruptibleAwaitDone();
        Throwable ex;
        if ((s &= DONE_MASK) == CANCELLED)
            throw new CancellationException();
        if (s == EXCEPTIONAL && (ex = getThrowableException()) != null)
            throw new ExecutionException(ex);
        return getRawResult();
    }

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                throw new InterruptedException();
        }
        if ((s &= DONE_MASK) != NORMAL) {
            Throwable ex;
            if (s == CANCELLED)
                throw new CancellationException();
            if (s != EXCEPTIONAL)
                throw new TimeoutException();
            if ((ex = getThrowableException()) != null)
                throw new ExecutionException(ex);
        }

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    @Override
    public void run() {
      ConcurrentLinkedHashMap<?, ?> map = mapRef.get();
      if (map == null) {
        throw new CancellationException();
      }
      int pendingTasks = 0;
      for (int i = 0; i < map.buffers.length; i++) {
        pendingTasks += map.bufferLengths.get(i);
      }

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