[scxml] update datamodel from Java

[Hallvard Trætteberg <ha...@idi.ntnu.no>]

  I came across this one in the archive and would like to comment:

>>  A simple implementation would
>>  reevalute all events without and event attribute, a better
>>  implemention may ask the script engine which expression depends on
>>  what.

>  Indeed. We cater to a number of expression languages and if some
>  provide an ability to conveniently build such expression dependency
>  graphs, we can incorporate them on a case-by-case basis. Much of the
>  work to come up with such graphs would best be done outside Commons
>  SCXML as this work is currently incidental to SCXML.

I've lately worked on integrating SCXML with Javascript and EMF
(Eclipse Modeling Framework). One use case is reacting to changes in an EMF
object graph (not SCXML's native datamodel). With this integration you 
can use
Javascript in events, conditions and actions. When used in an event, the 
read
accesses to the EMF objects are recorded, and if the read parts are changed,
a corresponding event is sent to the machine. This mechanism is useful for
both an application's business logic and user interface, and is fairly 
cleanly
integrated with SCXML.

Hallvard


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Re: [scxml] update datamodel from Java

[Rahul Akolkar <ra...@gmail.com>]

On Tue, Sep 21, 2010 at 5:13 AM, Hallvard Trætteberg <ha...@idi.ntnu.no> wrote:
>  I came across this one in the archive and would like to comment:
>
>>>  A simple implementation would
>>>  reevalute all events without and event attribute, a better
>>>  implemention may ask the script engine which expression depends on
>>>  what.
>
>>  Indeed. We cater to a number of expression languages and if some
>>  provide an ability to conveniently build such expression dependency
>>  graphs, we can incorporate them on a case-by-case basis. Much of the
>>  work to come up with such graphs would best be done outside Commons
>>  SCXML as this work is currently incidental to SCXML.
>
> I've lately worked on integrating SCXML with Javascript and EMF
> (Eclipse Modeling Framework). One use case is reacting to changes in an EMF
> object graph (not SCXML's native datamodel). With this integration you can
> use
> Javascript in events, conditions and actions. When used in an event, the
> read
> accesses to the EMF objects are recorded, and if the read parts are changed,
> a corresponding event is sent to the machine. This mechanism is useful for
> both an application's business logic and user interface, and is fairly
> cleanly
> integrated with SCXML.
>
<snip/>

Cool, if this is available somewhere please post a pointer (and if you
want, such a pointer can also be added to the "Who is using it?"
section at the bottom of the home page [1] ).

In the particular conversation you quote above, the idea was to have
the ability to track such data dependencies in expressions in a more
native SCXML datamodel sense -- which gets interesting across the
number of ELs we support.

-Rahul

[1] http://commons.apache.org/scxml/0.9/


> Hallvard
>

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