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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.

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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