So you mean commons-scxml users should provide their application specific
SCXMLSemanticImpl.java? Which method should we use to use a custom one that
lives in a different than org.apache.commons.scxml.semantics package?
Thanks,
-Nestor
----- Original Message ----
From: Rahul Akolkar <[EMAIL PROTECTED]>
To: Jakarta Commons Users List <commons-user@jakarta.apache.org>
Sent: Monday, May 21, 2007 10:58:29 PM
Subject: Re: [SCXML] Event types
On 5/21/07, Nestor Urquiza <[EMAIL PROTECTED]> wrote:
> Hi Rahul,
>
> Talking about this I do not know if I posted about it before ( lazy now to
> search in the archives ) but at some point I ( at least ) thought about a
> special event let us say "app.error" that I was hoping to use from a custom
> action for example to provide an "exception" mechanism.
>
> In a glance imagine your custom action needs to stop the normal course of
> your SCXML code. I was hoping to use the type ERROR to define a special event
> called "app.error" that would be included in the transition element to
> specify where to go when an unexpected exception occurs.
>
> My guess a while ago was that it would be great to make commons-SCXML
> "exception aware" meaning that if for some reason an event of ERROR type is
> raised the complete state machine would stop processing the current logic
> triggerred by a regular event and would then proceed to the transitions to
> move the FSM to a state corresponding to the error event transition target.
>
> Makes sense?
>
<snip/>
Yes, users can leverage the event types (either existing or new /
user-defined) to have application-specific semantics, as you indicate
above. However, Commons SCXML itself does not use the type
information.
-Rahul
> Thanks,
>
> -Nestor
>
> ----- Original Message ----
> From: Rahul Akolkar <[EMAIL PROTECTED]>
> To: Jakarta Commons Users List <commons-user@jakarta.apache.org>
> Sent: Monday, May 21, 2007 1:06:18 PM
> Subject: Re: [SCXML] Event types
>
> On 5/20/07, Hanh-Missi Tran <[EMAIL PROTECTED]> wrote:
> > Hi
> >
> > A TriggerEvent object is associated with a type (CALL_EVENT,
> > SIGNAL_EVENT, ..) but I don't know what they are used for. I look in
> > the source code but whenever an event is handled, its type is not used
> > (I'm wrong ?). So can someone tell me what they may be used for ?
> >
> <snip/>
>
> You are correct, the type information is not used.
>
> One of the intents of providing that was to use it as potential basis
> for priority (for example, a CHANGE_EVENT, since its usually a derived
> event, would have a lower priority etc.) -- but that was never
> realized in code (or spec).
>
> -Rahul
>
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