Re-Implement working NoParallelExecution

[michaelschnyder]

Applies to the following situation

Trigger has a Cron Definition of * * * * and a raises a jobrun at 12:00 which takes 5 mins.
Without NoParallelExecution, the trigger would again raise a jobRun at 12:01 even if the previous job did no complete.

-> NoParallelExecution does therefore prevent the trigger from triggering a new jobRun, but does not prevent other triggers from triggering a job.

[michaelschnyder]

I suggest to rename this feature to PreventJobRunDublication or use an enum JobRunDublication with (Ignore, Prevent)

@olibanjoli

[olibanjoli]

Duplication ;-)
Mhm I don't like the new name too much yet.

• ParallelExecution is a widely used term which is clear to everyone
• JobRunDuplication lacks the time component
• "Duplication of job runs" is a bit off to me since the feature is about blocking running something in parallel.

I'm sure there is a better name than NoParallelExecution.

Maybe

• DontTriggerIfPreviousDidNotFinish
• WaitForPrevious
• WaitForPreviousToFinish
• DisableConcurrency

[michaelschnyder]

So we decided to stick with this name for now, but have also discussed that we should extend the feature so that no other trigger (independent which type) can schedule a new run. Then it would be an update to the Job itself. See #46