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

            }


            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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        taskProgress = taskLength;
    }
    
    protected void checkCancelled() {
        if ( isCancelled() )
            throw new CancellationException();
    }

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          } else {
            return value;
          }


        case CANCELLED:
          throw new CancellationException("Task was cancelled.");


        default:
          throw new IllegalStateException(
              "Error, synchronizer in invalid state: " + state);
      }

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


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

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        }
    }
    
    protected void checkCancelled() {
        if ( isCancelled() )
            throw new CancellationException();
    }

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


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

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      if (_exception != null)
        throw new ExecutionException(_exception);
      else if (_isDone)
        return _value;
      else if (_isCancelled)
        throw new CancellationException();
      else
        throw new TimeoutException();
    }

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      if (_exception != null)
        throw new ExecutionException(_exception);
      else if (_isDone || count != _alarmCount)
        return _value;
      else if (_isCancelled)
        throw new CancellationException();
      else
        throw new TimeoutException();
    }

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    synchronized(this) {
      while (! _done && ! _cancelled)
        wait();


      if (_cancelled)
        throw new CancellationException();


      if (_exception != null)
        throw new ExecutionException(_exception);


      return _value;

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