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

        // If this thread successfully transitioned to COMPLETING, set the value
        // and exception and then release to the final state.
        this.value = v;
        // Don't actually construct a CancellationException until necessary.
        this.exception = ((finalState & (CANCELLED | INTERRUPTED)) != 0)
            ? new CancellationException("Future.cancel() was called.") : t;
        releaseShared(finalState);
      } else if (getState() == COMPLETING) {
        // If some other thread is currently completing the future, block until
        // they are done so we can guarantee completion.
        acquireShared(-1);

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  private static class ImmediateCancelledFuture<V> extends ImmediateFuture<V> {


    private final CancellationException thrown;


    ImmediateCancelledFuture() {
      this.thrown = new CancellationException("Immediate cancelled future.");
    }

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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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            }


            V innerGet() throws InterruptedException, ExecutionException {
                acquireSharedInterruptibly(0);
                if (getState() == CANCELLED)
                    throw new CancellationException();
                if (exception != null)
                    throw new ExecutionException(exception);
                return result;
            }

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            V innerGet(long nanosTimeout) throws InterruptedException, ExecutionException, TimeoutException {
                if (!tryAcquireSharedNanos(0, nanosTimeout))
                    throw new TimeoutException();
                if (getState() == CANCELLED)
                    throw new CancellationException();
                if (exception != null)
                    throw new ExecutionException(exception);
                return result;
            }

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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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                // 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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        this.latch.countDown();
      }
      
      if (this.state.get() == State.CANCELLED)
      {
        throw new CancellationException();
      }
      
      if (time == Long.MAX_VALUE)
      {
        this.latch.await();

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      }


      @Override
      public R get() throws InterruptedException, ExecutionException {
         if (isCancelled())
            throw new CancellationException("MapReduceTask already cancelled");
         try {
            return call.call();
         } catch (Exception e) {
            throw new ExecutionException(e);
         } finally {

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