Hi Rahul, Thanks for your suggested work arounds. I think the count check on the SCXMLListener tracer would work for e for now. But I am eagerly waiting for 0.6 with your enhancement :-)
To clarify, if there had been an onEvent() callback, I could have easily checked if the event made it. I was considering events that do not effect to a state transition (due to a condition, for example). Now, with the work around, I will ensure that all events do effect a state transition for now. Also, thanks for your sugegstions on implementing role based events. That was very helpful. Regards -- Raj --- Rahul Akolkar <[EMAIL PROTECTED]> wrote: > On 9/29/06, Madhwaraj Rao <[EMAIL PROTECTED]> > wrote: > > Hi Rahul, > > > > I found it difficult to implement your suggestion. > > Events are asynchronous in my system, and having > this > > approach of first triggering an event, and > verifying > > that it resulted in a state transition (in an > > EntryListener.onTransition()) is error prone. What > if > > an event didn't result in a state transition? > > > <snip/> > > Then you know its "invalid" (I keep quoting it since > there is no such > thing, I'm just using the term in the context of > your application). > > > > Can you please sned me a code snippet with your > > approach so I can really verify that it could be > > applicable for me? > > > <snap/> > > Sure. Here are examples of the workarounds I was > talking about: > > <example-1> > > Set before = > executor.getCurrentStatus().getStates(); > > // fire the event(s) ... executor.triggerEvent(...) > etc. > > Set after = executor.getCurrentStatus().getStates(); > > // compare before and after (ofcourse, won't work if > there are self transitions) > > </example-1> > > -- OR -- > > <example-2> > > // say tracer tracks the count of the number of > transitions followed > SCXMLListener tracer = new TransitionTracer(); > executor.addListener(scxml, tracer); // scxml is the > oacsm.SCXML instance > > int before = tracer.count(); > > // fire the event(s) ... executor.triggerEvent(...) > etc. > > int after = tracer.count(); > > // if after == before, invalid > > </example-2> > > etc. ... > > > > Ideally, I would have liked a onEvent() callback > in > > the EntryListener. > > > <snip/> > > Not sure I understand. > > > > My other requirement is to prevent some events to > > effect a state transition if the user role doesn't > > have the right privileges. > > > <snap/> > > Yes, this is a common requirement. You can implement > it: > > * As a layer around Commons SCXML, using whatever > means you choose to > verify the user access rights as a function of the > current user and > current status of the state machine > > * As conditionals inside the SCXML document itself, > guarding > transitions and datamodel access appropriately > (possibly using custom > functions within the expression language chosen) > > -Rahul > > > > Thanks > > -- > > Raj > > > > --- Rahul Akolkar <[EMAIL PROTECTED]> wrote: > > > > > On 9/27/06, Madhwaraj Rao > <[EMAIL PROTECTED]> > > > wrote: > > > > Hello, > > > > > > > > I tried sending an invalid event to the state > > > machine > > > > and didn't see any error being reported. By > > > invalid I > > > > mean this event was not expected in the > current > > > state. > > > > > > > > Does the SCXMLSemanticsImpl report an error > (via > > > the > > > > the ErrorReporter) when such an event is > silently > > > > discarded? > > > > > > > <snip/> > > > > > > No, because the semantics treat it as simply an > > > inconsequential > > > trigger (causing no change to the state > machine), > > > rather than an > > > error. > > > > > > One of the ways you could track this is to > register > > > a SCXMLListener on > > > the executor and track onTransition() callbacks > (if > > > you get none, the > > > trigger is "invalid" -- per your definition > above). > > > > > > -Rahul > > > > > > > > > > Thanks > > > > -- > > > > Raj > > > > > > > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: > [EMAIL PROTECTED] > For additional commands, e-mail: > [EMAIL PROTECTED] > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
