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Feature: Move schedule monitoring to its own thread #4
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Previous Architecture
Previous, every 30 cycles through the sentinel guard loop, the database was queried for schedules which need to be run. This assumed the guard loop was executed at once per second and also adds additional unnecessary work roughly every 30 seconds.
New Architecture
With this change, the scheduler check is preformed in a dedicated thread, which blocks for 60s, then queries the database. As the highest resolution of schedules is one minute, this means the check is done as infrequently as possible.
Considerations
There will be some slight time drift, as the call to
scheduleris not a zero-time call, but the drift should be in the order of milliseconds and we're not a hard real time scheduling system here.