NAME
alarm_handler - An Alarm Handling ProcessDESCRIPTION
The alarm handler process is a gen_event event manager process that receives alarms in the system. This process is not intended to be a complete alarm handler. It defines a place to which alarms can be sent. One simple event handler is installed in the alarm handler at startup, but users are encouraged to write and install their own handlers. The simple event handler sends all alarms as info reports to the error logger, and saves all in a list. This list can be passed to a user-defined event handler, which can be installed later. The list can grow large if many alarms are generated. This is a good reason to install a better user-defined handler. Functions are provided to set and clear alarms. The alarm format is defined by the user. For example, an event handler for SNMP can be defined, together with an alarm Management Information Base (MIB). The alarm handler is part of the SASL application. When writing new event handlers for the alarm handler, the following events must be handled:- {set_alarm, {AlarmId, AlarmDescr}}:
- This event is generated by alarm_handler:set_alarm({AlarmId, AlarmDecsr}).
- {clear_alarm, AlarmId}:
- This event is generated by alarm_handler:clear_alarm(AlarmId).
EXPORTS
clear_alarm(AlarmId) -> void()
Types:
AlarmId = term()
Sends event clear_alarm to all event handlers.
When receiving this event, the default simple handler clears the latest received
alarm with id AlarmId.
Returns a list of all active alarms. This function can only be used when the
simple handler is installed.
Types:
alarm() = {AlarmId, AlarmDescription}
AlarmId = term()
AlarmDescription = term()
Sends event set_alarm to all event handlers.
When receiving this event, the default simple handler stores the alarm.
AlarmId identifies the alarm and is used when the alarm is
cleared.
SEE ALSO
error_logger(3erl), gen_event(3erl)| sasl 4.2 | Ericsson AB |