IPF Persistent Scheduler
Introduction
IPF’s Persistent Scheduler allows you to schedule jobs of any kind.
It is based on the Quartz scheduler, and works with cron expressions in combination with calendars in order to execute one-time or recurrent jobs. It also features a persistence layer whose main role is to keep single source of truth with regards to the definition of tasks and also persists job history in an append-only journal.
The Scheduler also features failsafes such as a rescheduling module which runs at startup and restores all the scheduled
jobs back into Quartz after a previous failure. To use the Scheduler, start with SchedulingModuleInterface.
Finally, it is designed to be run in a Akka Cluster to ensure that jobs are scheduled across the cluster and can survive any number of node failures (including a total outage). Certain aspect like rehydration of jobs and processing of failed jobs are run on a Cluster Singleton to prevent duplicate processing in these scenarios.
The architecture for the scheduler is shown below:
