Unique until started

[charithe]

Hi. The effect I am trying to achieve is to have only a single job enqueued for a given set of arguments. However, if a job with the same arguments is currently in the running state, I would like a new instance to be enqueued. This is because the currently running job probably won't see the new information that had just been added to the database.

I thought I would be able to achieve this by removing JobStateRunning from the unique-by-state list but it turns out that it is one of the mandatory states that must exist in that list.

The only other way I could think to achieve this is to list the jobs of the kind and, if there's a job in the running state, keep retrying the job insertion until it succeeds. That feels like a brittle solution though. Do you have any better suggestions for addressing this kind of scenario?