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Behaviours: sbroker_meter.
Sets an alarm when the regulator's valve is slow to get a match for an interval.
sregulator_underload_meter can be used in as a sbroker_meter in a
sregulator. It will set a SASL alarm_handler alarm when the regulator's
valve is slow to get a match for an interval and clear it once the valve
gets matches fast for an interval. Its argument, spec(), is of the form:
#{alarm => Alarm :: any(), % default: {underload, self()}
target => Target :: integer(), % default: 100
interval => Interval :: pos_integer()}. % default: 1000
Alarm is the alarm_handler alarm that will be set/cleared by the meter
(defaults to {underload, self()}). Target is the target relative time for
the valve to get a match (defaults to 100). Interval is the interval in
milliseconds (defaults to 1000) that the valve must be above the target for
the alarm to be set and below the target for the alarm to be cleared. The
description of the alarm is {valve_slow, self()}.
sregulator because a sregulator_valve
will remain open when processes that should be available are not sending
requests and can not do anything to correct this. Whereas a sbroker can
not distinguish between one queue receiving too many requests or the other
too few. In either situation the congested sbroker_queue would drop
requests to correct the imbalance, causing a congestion alarm to be cleared
very quickly.Generated by EDoc