Cancels the unit of work represented by this reference.
Cancels the unit of work represented by this reference.
Guaranteed idempotency - calling it multiple times should have the same side-effect as calling it only once. Implementations of this method should also be thread-safe.
Returns this future's cancelable reference.
Returns this future's cancelable reference.
Returns the underlying Future
reference.
Returns the underlying Future
reference.
Represents an asynchronous computation that can be canceled as long as it isn't complete.