[ http://issues.apache.org/jira/browse/TUSCANY-546?page=all ]
Geoff Winn updated TUSCANY-546:
-------------------------------
Attachment: TUSCANY-546.patch
I've implemented one option for making the type system more flexible and the
changes are attached as a patch.
Built and tested on XP with VC7.1 and RHEL3.
This version allows brand new types to be added after a data object has been
created, however existing types cannot be modified. An attempt to create a
duplicate type is treated in the same way as it was previously.
> Flexible Type System
> --------------------
>
> Key: TUSCANY-546
> URL: http://issues.apache.org/jira/browse/TUSCANY-546
> Project: Tuscany
> Issue Type: Improvement
> Components: C++ SDO
> Affects Versions: Cpp-current
> Environment: all
> Reporter: Ed Slattery
> Assigned To: Geoff Winn
> Fix For: Cpp-current
>
> Attachments: TUSCANY-546.patch
>
>
> The SDO type system may be added to by loading a schema, or by using the data
> factory addType/addPropertyToType apis. When the first data object is
> created, the type system is frozen and the properties of parent types are
> transferred to child types - the system is 'resolved'.
> There is a requirement being proposed that we should be able to unfreeze the
> system, and add new types after the first data object creation, as long as
> the new ones dont cause the old model to be modified.
> This has substantial knock on effects, and would need to be designed
> carefully.
> Ths issues to consider:
> 1) A type is loaded which is already in the system - throw, or warn, or
> silently ignore?
> 2) Attempt to add a property to an existing type - throw or ignore?
> 3) When moving data objects from one factory to another - the compatibility
> of type systems is tested - would need to narrow this to validation only of
> the types actually being copied at the time.
> The suggestion is that the sensible place to add this is in AddType, which
> could, after resolve, simply still work, but add types not to the type
> system, but to a resolver cache. At any object instantiation, if the resolver
> cache is not empty, then a new resolve of only the new types is performed.
> Duplicate types are silently ignored.
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