[erlang-questions] Sending messages to gen_event manager

Ben Hood 0x6e6562@REDACTED
Sat Jul 21 17:59:56 CEST 2007

Thanks for clarifying point 1 so concisely.

> > 2. Say I have multiple event handlers that need to respond differently
> > to different types of events, it is a sounder design to add multiple
> > callbacks to one event manager and then pattern match on the
> > handle_event/2 callback, or does it make more sense to just create a
> > new event manager for each event type?
> >
> > Naively I would go for the latter option, but this may create lots of
> > event manager processes. Is this problematic?
> This is pretty much a design decision depending on the types of
> events, and what you do with them.  Either approach will work fine,
> it's just a matter of figuring out which is simplest in your case.
> Be aware that all event handlers run in series in the process of the
> event manager.  An event handler which crashes is silently deleted
> from the event manager - use add_sup_handler to get notifications of
> this.

So the implication of the serial execution is that if you wanted
different events to be handled by different handlers concurrently, you
would have to use separate manager processes, right?



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