Generic client interface for Monitor callbacks.
A client can register a Consumer callback anytime with the system
Monitor.
The client specifies what type of event it is interested in e.g.
periodic, on change, trigger etc. and specifies a Consumer object.
Everytime the Monitor wants to signal an event to the client it
triggers the Consumer callback (handler).
Consumer is created locally by the client.
readonly attribute long pending;
pending (readonly) - number of monitors using this Consumer
oneway void handler(in MonitorInfo info);
callback to be trigerred by Montiro everytime there is an event
info -info passed by Monitor to client
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