runOnce

Step function to process one job from the Messenger.graderQueue

Works as follows:

• clean any reserved jobs from Messenger.graderReservedQueue

• get next job from Messenger.graderQueue

• pop and parse the job to a JobRequest

• fire the JobRequest

• catch any throwables

• finally delete this one incoming job from Messenger.graderReservedQueue

Step function to process one provided message from the subscription channels

Works as follows:

• pop and parse the job to a JobRequest

• fire the JobRequest