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

          } 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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    public T get() throws IOException, CancellationException {
        synchronized (lock) {
            switch (await()) {
                case DONE: return (T) result;
                case FAILED: throw (IOException) result;
                case CANCELLED: throw new CancellationException("Operation was cancelled");
                default: throw new IllegalStateException("Unexpected state " + status);
            }
        }
    }

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    public T getInterruptibly() throws IOException, InterruptedException, CancellationException {
        synchronized (lock) {
            switch (awaitInterruptibly()) {
                case DONE: return (T) result;
                case FAILED: throw (IOException) result;
                case CANCELLED: throw new CancellationException("Operation was cancelled");
                default: throw new IllegalStateException("Unexpected state " + status);
            }
        }
    }

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    }
    jobRecord.setState(State.CANCELED);
    UpdateSpec updateSpec = new UpdateSpec(jobRecord.getRootJobKey());
    updateSpec.getNonTransactionalGroup().includeJob(jobRecord);
    if (jobRecord.isExceptionHandlerSpecified()) {
      executeExceptionHandler(updateSpec, jobRecord, new CancellationException(), true);
    }
    backEnd.save(updateSpec, jobRecord.getQueueSettings());
  }

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        while (true) {
            attempts++;
            try {
                slot = queue.poll(this.pollTimeout, TimeUnit.MILLISECONDS);
            } catch (InterruptedException e) {
                throw new CancellationException();
            }


            if (null != slot)
                break;

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        producerThread = Thread.currentThread();


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

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        }


        @Override
        public T get() throws InterruptedException, ExecutionException {
            if (canceled) {
                throw new CancellationException();
            }
            return target.get();
        }

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        }


        @Override
        public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
            if (canceled) {
                throw new CancellationException();
            }
            return target.get(timeout, unit);
        }

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        }


        @Override
        public T get() throws InterruptedException, ExecutionException {
            if(canceled) {
                throw new CancellationException();
            }
            
            T object = null;


            try {

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        }


        @Override
        public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
            if (canceled) {
                throw new CancellationException();
            }
            
            T object = null;


            try {

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