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From "Ate Douma (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SCXML-187) Add support for initial SCXML script (SCXML spec 3.2.2: <scxml> children)
Date Fri, 17 Jan 2014 13:05:19 GMT
Ate Douma created SCXML-187:
-------------------------------

             Summary: Add support for initial SCXML script (SCXML spec 3.2.2: <scxml>
children) 
                 Key: SCXML-187
                 URL: https://issues.apache.org/jira/browse/SCXML-187
             Project: Commons SCXML
          Issue Type: New Feature
    Affects Versions: 2.0
            Reporter: Ate Douma
            Assignee: Ate Douma
             Fix For: 2.0


The SCXML spec [1] section 3.2.2 <scxml> children, defines as an allowable child element:
- <script> Provides scripting capability. Occurs 0 or 1 times.

Current Commons SCXML doesn't yet support this feature, ignoring such initial script element.
As this will be very useful also for the Groovy language support (SCXML-186), I'll add this
feature to Commons SCXML now.

Important to note is the Context to be provided to such initial script execution.
The intend (at least in my interpretation) of using such an initial script is that it can
access as well as set any context (data) variable globally for the rest of the document.
This means that the Context for the initial script execution much be a parent Context for
all other element, including sibling 'root' states.
Using the root Context for this purpose however is IMO not the right way as it would (potentially)
impact/change the outcome of a reset of the SCXMLExecutor, which resets all Contexts except
for the root Context (as being a provider of *external* context).
So, the way I'm going to solve this is by introducing a separate InitialScriptContext, having
the root Context as parent and itself being used as parent for all other contexts, and thereby
properly resettable through SCXMLExecutor reset.

[1] http://www.w3.org/TR/2013/WD-scxml-20130801/



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