Guewen Baconnier ebe52ef481 Avoid to hits the database too many times to check if the list of ...

printers needs to be refreshed.

Keep the last update datetime in cache and invalidate this datetime if is
is older than POLL_INTERVAL.  Thus, one process won't hit the DB more
than 1 time every POLL_INTERVAL (10 seconds currently) to check if it
needs to update the list.

2017-10-03 18:13:01 +02:00

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