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From "Ate Douma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SCXML-101) <datamodel> not handled as global
Date Wed, 11 Feb 2015 22:54:13 GMT

    [ https://issues.apache.org/jira/browse/SCXML-101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14317153#comment-14317153
] 

Ate Douma commented on SCXML-101:
---------------------------------

The early vs lazy initialization as defined by the specification is not yet covered properly,
so I'll leave this issue open for now to be resolved later.

> <datamodel> not handled as global
> ---------------------------------
>
>                 Key: SCXML-101
>                 URL: https://issues.apache.org/jira/browse/SCXML-101
>             Project: Commons SCXML
>          Issue Type: Bug
>    Affects Versions: 0.9
>            Reporter: Ingmar Kliche
>            Assignee: Ate Douma
>             Fix For: 2.0
>
>
> The SCXML spec says: "Logically, there is a single globally visible data model for the
entire state machine. As an authoring convenience, however, we allow <datamodel> as
a child of any <state>, thus allowing parts of the data model to be distributed throughout
the document closer to the locations where the data will be accessed. However, all instances
of the <data> element are created and initialized when the state machine is instantiated
and may be accessed from any state at any time." [1]
> There are two issues:
> 1) The current impl of commons-scxml introduced a scoping, such that <data> in
<datamodel> elements contained within a <state> are only visible in this state
and its children (due to context chain). I.e. the <datamodel> is not entirely global.
> 2) Initialization of <datamodel>'s contained in a <state> (i.e. non-root-datamodels)
take place while entering the corresponding state for the first time while creating the context
(SCXMLInstance#getContext()). But initialization of <data> elements has to take place
at state machine initialization time.
> [1] http://www.w3.org/TR/scxml/#datamodel



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