Perform an unclean shutdown of the executor only waiting up to maxWaitSeconds
Perform a "clean" shutdown of the executor by waiting for all tasks to finish
Attempt to submit this job to the queue.
Attempt to submit this job to the queue. Returns true if successful or false if the queue is full
Attempt to submit this job to the queue.
Attempt to submit this job to the queue. Returns Some(...) if successful or None if the queue is full