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From Sylvain Wallez <sylv...@apache.org>
Subject Re: [RT] The API for the request object
Date Tue, 06 Jul 2004 16:52:09 GMT
Vadim Gritsenko wrote:

> Jeremy Quinn wrote:
>
>> On 6 Jul 2004, at 11:13, Sylvain Wallez wrote:
>>
>>>> Now, the basic mechanism for this could be to scan all attribute 
>>>> values of the request and find out if the value should be cleaned 
>>>> up or not. This could be done by either testing for the usual 
>>>> suspects from Avalon (Disposable, Recyclable) or by defining a new 
>>>> Cocoon specific interface.
>>>> But perhaps there is a better way?
>>>>
>>>
>>> What about adding a list of ProcessingListeners to the object model, 
>>> which can be augmented by the various components that participate in 
>>> request handling, and is called at particular places such as:
>>> - processing start (such listeners must be registered in the xconf),
>>> - sitemap mount,
>>> - end of pipeline building,
>>> - start of pipeline execution (differs from the previous one as it 
>>> may not be called if the result is cached)
>>> - end of pipeline execution
>>> - end of processing
>>>
>>> That would allow e.g. a flowscript to register a listener that 
>>> closes a hibernate session once the processing is terminated, thus 
>>> allowing the same session to be used in the view.
>>>
>>
>> I believe this is already possible with the JXTemplate callback hook:
>>
>>     catch (return) {session.close ()}
>>
>> though there does seem to be a lot of confusion about it and the 
>> syntax is strange ;)
>
>
> I think those listeners are not only for flowscript, but more generic 
> approach. Btw, sendPageAndWait also has a provision for clean up 
> function. Problem is it does not work each time [1].


Yep. We could reimplement this feature with sitemap listeners, therefore 
solving this predictability problem.

Sylvain

-- 
Sylvain Wallez                                  Anyware Technologies
http://www.apache.org/~sylvain           http://www.anyware-tech.com
{ XML, Java, Cocoon, OpenSource }*{ Training, Consulting, Projects }


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