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From Marshall Schor <...@schor.com>
Subject Re: [jira] [Commented] (UIMA-2903) List resources in a ResourceManager / remove hack in uimaFIT
Date Mon, 10 Jun 2013 15:24:41 GMT
In order to help us think through the architectural implications of these kinds
of changes, I think it will be helpful to add a couple of architecture sections
to the UIMA wiki that document the use cases and design considerations for
things like external resources and resource managers.

I'll start some pages on these.

-Marshall
On 6/7/2013 7:14 PM, Richard Eckart de Castilho (JIRA) wrote:
>     [ https://issues.apache.org/jira/browse/UIMA-2903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13678562#comment-13678562
] 
>
> Richard Eckart de Castilho commented on UIMA-2903:
> --------------------------------------------------
>
> Is it a conscious design decisions that resources created via ResourceManager do not
know about the ResourceManager they were created in? 
>
> *Allow access to creating ResourceManager* -- It would seem to be useful that one registered
resource could access a ResourceManager to request another registered resource. Currently,
a resource apparently gets its own ResourceManager and does not see its fellow resources.

>
> *Defer call to Resource.initialize() for shared resources* -- If a resource could see
the ResourceManager that created it, it would also be useful either to defer the invocation
of the initialize() method until all non-parametrized resources have been instantiated in
ResourceManager_impl. initializeExternalResources(), so that a resource may fetch another
resource instance (although the latter may not yet have been initialized). 
>
> These two features might be an alternative solution to adding a listResources() method,
because uimaFIT could then invoke the ExternalResourceInitializer in the initialize() method
and wouldn't have to try and defer that.
>
>                 
>> List resources in a ResourceManager / remove hack in uimaFIT
>> ------------------------------------------------------------
>>
>>                 Key: UIMA-2903
>>                 URL: https://issues.apache.org/jira/browse/UIMA-2903
>>             Project: UIMA
>>          Issue Type: Improvement
>>          Components: Core Java Framework, uimaFIT
>>            Reporter: Richard Eckart de Castilho
>>
>> uimaFIT currently gets a list of resources that are registered with a ResourceManager.
This is handled via accessing the "mResourceMap" field of the ResourceManager_impl class via
reflection. Obviously, this is not a good solution.
>> uimaFIT iterates over the resources in the context while initializing resources that
are referenced form other external resources.
>> There may be two options:
>> # add a listResources() method to the ResourceManager interface
>> # get the resources that need to be initialized in some other way. I don't know if
there is one, because if there was, I'd probably have used it. Looking at the @ExternalResource
annotations doesn't help, because they do not give informations about the resource bindings.
The bindings are only available in the ResourceManager, which takes us back to 1).
>> Would it be possible to add a method allowing to list the resource bindings registered
in a ResourceManager to the ResourceManager interface?
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