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From Richard Eckart de Castilho <...@apache.org>
Subject Re: messed up the impl of UIMA-2977 - calling destroy() method on External Resources
Date Fri, 21 Oct 2016 15:38:02 GMT
Hi all,

I also found the external resources part a bit confusing when I did the
external resources support for uimaFIT...

If I remember correctly, then there is at least one place in uimaFIT 
where I do rely on type erasure in order to smuggle some class object
through that does actually not fit the generic type defined in uimaFIT...
... I am not proud of it, but it works.

> On 21.10.2016, at 16:09, Marshall Schor <msa@schor.com> wrote:
> The new "destroy()" method on ResourceManager will have to filter the
> propagating of this to the external resources in this list, only doing this call
> for InnerImplementations that implement the destroy() method.  There's no API
> other than "Resource" for declaring this, so I propose to use this in filtering
> the destroy calls, something like:
>  if (candidate instanceof Resource) ((Resource)candidate).destroy();


> I plan to revert the change that required InnerImplementation classes to
> implement Resource, along these lines.


So here are some good/bad things about "customResourceSpecifier"
[+] it allows arbitrary InnerImplementation
[+] no need to implement Resource
[+] no mandatory built-in "properties" (like e.g. the setUrl in configurableDataResourceSpecifier)

[-] no life-cycle events, in particular no destroy()
[-] only string parameters

... and here some good/bad things about "configurableDataResourceSpecifier"
[+] life-cycle events
[+] same type of parameters (String, bool, lists, etc.) as for AEs etc. in UIMA
[-] mandatory built-in "properties" (setUrl());

What I would really find useful would be a "configurableResourceSpecifier" with these properties:
[+] gets life-cycle events (if it implements Resource interface, otherwise not) 
[+] same type of parameters (String, bool, lists, etc.) as for AEs etc. in UIMA
[+] no mandatory properties (like setUrl())


-- Richard

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