Interface IJobFailureObserver

Namespace

Millrace.Workflows

Assembly

Millrace.dll

Lets a layer above react when the substrate dead-letters a job, by contributing work that commits with that job's own terminal transition.

public interface IJobFailureObserver

Remarks

A saga compensates when an activity fails past its retry policy — but at that moment nothing of the engine is running: the activity threw, and the worker dead-letters the job on its own. Without this the workflow would never learn that one of its steps died, and the instance would sit in Running forever with no failure recorded anywhere.

The observer returns records rather than writing anything, for the same reason the dispatcher does: a notification inserted separately could be lost while the job still went Dead, which is precisely the half-state the atomic transition exists to prevent.

Methods

OnDeadLettered(JobRecord)

Jobs to insert atomically with job's dead-letter transition. Empty when this observer has nothing to say about the job.