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https://issues.apache.org/jira/browse/TUSCANY-1459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12514015
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Frank Budinsky commented on TUSCANY-1459:
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Patch looks perfect!
Can we apply it or does it cause breakage if not syncronized with TUSCANY-1143?
> Remove package registry delegation to EPackage.Registry.INSTANCE
> ----------------------------------------------------------------
>
> Key: TUSCANY-1459
> URL: https://issues.apache.org/jira/browse/TUSCANY-1459
> Project: Tuscany
> Issue Type: Improvement
> Components: Java SDO Implementation
> Affects Versions: Java-SDO-1.0
> Environment: WinXP
> Reporter: Fuhwei Lwo
> Priority: Critical
> Fix For: Java-SDO-1.0
>
> Attachments: 1459.patch
>
>
> This improvement is to reduce today's 3 tier registry delegation mechanism to
> 2 tier's so we won't rely on EPackage.Registry.INSTANCE.
> Current design:
> The default HelperContext created by using HelperProvider.getDefaultContext()
> is using the EPackage.Registry.INSTANCE as its package registry that can be
> delegated to the TCCL's registry. The local HelperContext created by using
> api.SDOUtil.createHelperContext() is creating a local package registry that
> can delegate to the builtInModelRegistry that potentially delegates to the
> EPackage.Registry.INSTANCE.
> default HelperContext (EPackage.Registry.INSTANCE/TCCL based)
> local HelperContext (local package registry) --delegate-->
> builtInModelRegistry --delegate--> EPackage.Registry.INSTANCE
> EMF, SDO runtime models, SDO type models are resided in the
> EPackage.Registry.INSTANCE
> SDO type models (sdoModel.xsd, sdoJava.xsd, sdoXML.xsd, and sdoInternal.xsd)
> are resided in both builtInModelRegistry and
> EPackage.Registry.INSTANCE (registered in the FactoryBase.java)
> User models will reside either in the EPackage.Registry.INSTANCE or local
> package registry
> New design:
> The builtInModelRegistry will become the end of registry delegation chain
> that would contain all required EMF and SDO runtime models and type models.
> The user models will reside at the local registry created for the helper
> context. If it's the default helper context, the special registry will be the
> SDOPackageRegistryDelegator that is similar to
> EPackage.Registry.INSTANCE$Delegator that would look up TCCL's registry and
> at the end of chain delegates to the builtInModelRegistry. If it's the local
> HelperContext, a regular Hashmap registry will be used then delegates to the
> builtInModelRegistry.
> default HelperContext (SDOPackageRegistryDelegator/TCCL based) --delegate-->
> builtInModelRegistry
> local HelperContext (local package registry) --delegate-->
> builtInModelRegistry
> EMF, SDO runtime, and SDO type models all reside in the builtInModelRegistry
> User models will reside either in the SDOPackageRegistryDelegator(TCCL based)
> or local package registry
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