Cache scheduled jobs in memory so they can be executed without polling #205
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This was referenced Jan 25, 2021
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Replaces #163.
Uses a Concurrent::ScheduledTask that is able to schedule future jobs in memory; this is how Rails' Async adapter works. ScheduledTasks are stored in a TimerSet per Scheduler object, which has a
max_cachevalue.When a Scheduler is created, existing jobs are queried to prefill the cache with values. Otherwise, future-scheduled jobs are added to the cache as they are created/notified.
MAX_CACHE/--max-cacheconfiguration options; set to0to disable.Relates to #139 and #90.