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Subject: RE: [SCXML] W3C specs compatibility and state transition issues
Date: Fri, 11 Apr 2008 13:34:24 -0700
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Thread-Topic: [SCXML] W3C specs compatibility and state transition issues
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From: "Ouyang, Landon - ES/RDR -Gil" <Landon.Ouyang@itt.com>
To: Jakarta Commons Users List <user@commons.apache.org>
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Hi Rahul,

Thanks for the quick and helpful response. I am still having trouble
creating a conditional state transition. Using your example, I added a
conditional transition in my XML file as follows:

<state id=3D"six">
<datamodel>
        <data name=3D"result">
                <value>0</value>
        </data>
</datamodel>
 <transition cond=3D"$(result.value eq '1')" target=3D"zero"
event=3D"display.next"/>
 <transition cond=3D"$(result.value eq '0')" target=3D"seven"
event=3D"display.next"/>
 <transition target=3D"five" event=3D"display.prev"/>
</state>

My handler for state 6 is the following:
public void six(){
      getEngine().getRootContext().set("result.value", "1");
        }

I have a NEXT button in my GUI that fires off the 'display.next' event.
In state 5, I hit this NEXT button and this code gets executed. I would
assume that when I hit the NEXT button again I should be in state 0, but
instead I stay in state 6 indefinitely!

Can you tell me what I am doing wrong?

--
Landon Ouyang
Member Technical Staff
ITT Electronics Systems, Radar Systems - Gilfillan
7821 Orion Ave,
Van Nuys, CA 91406
(818) 901-2982

-----Original Message-----
From: Rahul Akolkar [mailto:rahul.akolkar@gmail.com]
Sent: Thursday, April 10, 2008 6:22 PM
To: Jakarta Commons Users List
Subject: Re: [SCXML] W3C specs compatibility and state transition issues

On Thu, Apr 10, 2008 at 8:30 PM, Ouyang, Landon - ES/RDR -Gil
<Landon.Ouyang@itt.com> wrote:
> Apologize for the duplicate e-mail, I had to be schooled on the proper
format by Mr. Cooper. :)
>
>
> I am a new user of Commons SCXML. I have two very basic questions:
>
> 1)      How much of the W3C specs for SCXML is supported with Common
SCXML? Are all of the tags recognized?
>
<snip/>

Not supported:
  <anchor> (supporting this one is optional for engines)
  <validate>

Experimental (due to missing pieces in draft spec, see TBD markers for
example):
  <invoke>


> 2)      Basing my code off of the simple stopwatch example, I created
a simple Java app that navigated across 10 states. I noticed that if I
put any code in the state handler methods that fires off events to
transition to other states, the application still thinks I am in the
*previous* state! For example, if I am in the state 5 subroutine and
fire off an EVENT_NEXT event to go to state 6, the app actually keeps me
in state 5 because it still thinks I am in state 4! Is it true that the
state machine transitions *after* the handler for the new state is
called? If so, how do I put custom code so that the state can make
transition decisions based on certain conditions?
>
<snap/>

You'd have to do that asynchronously (the executor is still processing
the earlier event). However ...

I'd store the result of "certain conditions" in the datamodel, and
query the datamodel later, like so:

public void foo() { // handler for state "foo"

    // check certain conditions, create someresultbean

    getEngine().getRootContext().put("fooresult", someresultbean);
}

And further, in a totally fictitious example:

<state id=3D"foo">
    <transition cond=3D"fooresult.success" target=3D"bar"/>
    <transition cond=3D"fooresult.numfailures gt 2" target=3D"exit"/>
    <transition cond=3D"not fooresult.success" target=3D"foo"/> <!-- try
again -->
    <!-- foo's other content -->
</state>

-Rahul


>
>
> --
> Landon Ouyang
> Member Technical Staff
> ITT Electronics Systems, Radar Systems - Gilfillan
> 7821 Orion Ave,
> Van Nuys, CA 91406
> (818) 901-2982
>

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