Re: [Boost-users] [statechart] Broadcasting events to orthogonal states

Subject: Re: [Boost-users] [statechart] Broadcasting events to orthogonal states
From: Bill Clark (bill_at_[hidden])
Date: 2009-09-08 12:38:48

If I'm not mistaken, this is addressed at
http://www.boost.org/doc/libs/1_40_0/libs/statechart/doc/rationale.html#Limitations,
in the section on "event dispatch to orthogonal regions."

Bill

2009/9/8 Vladimír Třebický <vladimir.trebicky_at_[hidden]>

> Hi all,
>
> first of all: thanks for the great library!
>
> I just dug into the boost::statechart tutorial trying to figure out
> how to deal with the following simple scenario: Let's say I have a
> complex application server represented by a single boost::state_chart
> with multiple modules (eg. network, database, etc.) represented by
> orthogonal spaces. I have a couple of system-wide events like "system
> shutdown". Handling these eventa is generally non-trivial and I'd like
> all the modules to process it independently. As I understand,
> statechart tries to deliver an event across al of the orthogonal
> spaces discarding it once it's processed by any of them (ie. by
> "return transit", "return discard_event", etc.). But I'd like these
> events to be delivered to _all_ orthogonal spaces no matter what they
> do with it.
>
> I could create a state for each of the orthogonal spaces. These
> wrappers would accept the system-wide events, translate them to
> local-events, post them locally and forward the system-wide event. But
> that's basically like having multiple statecharts for each of the
> modules and dispatching system-wide events manually.
>
> Thanks,
> Vladimir.
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