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From Ralph Goers <>
Subject Re: Modifying pipeline at request time?
Date Sun, 27 Jun 2004 21:13:08 GMT
He asked if it was possible.  I agree - I would never dynamically generate 
a sitemap. Debugging and maintaining that could be a nightmare.


At 6/27/2004  05:37 AM, you wrote:
>On 27.06.2004 01:28, Ralph Goers wrote:
>>I should think one could write an action that generates a sub-sitemap and 
>>then cause that sub-sitemap to be invoked from the action using a source 
>Ok, this *might* work, but it sounds hacky and will be a hell to maintain, 
>won't it?
>IMO having many different pipelines, one for each document type, and 
>reusing the common parts via resources is much cleaner.
>>At 6/26/2004  08:17 AM, Joerg Heinicke wrote:
>>>>I would like to be able to dynamically generate and/or modify a pipeline at
>>>>request time, so that I can create an aggregated response using one or more
>>>>sub-documents, to be chosen based on the request. I'd also like to be 
>>>>able to
>>>>choose, at the same time, appropriate Transformers depending on the data
>>>>requested, and probably choose a Serializer as well. In short, I'd like 
>>>>to be
>>>>able to build a pipeline from scratch at request time.
>>>>I'd really rather not do this by performing if/else logic with a 
>>>>Selector in the
>>>>sitemap, because I don't want to have to edit it every time I create a 
>>>>new type
>>>>of sub-document.
>>>>I'm open to writing an action, using Flowscript, or just about anything 
>>>>that will perform well. I looked at the API for pipeline-related 
>>>>classes, but I
>>>>didn't see an obvious place to start. I'm also happy to achieve the 
>>>>same result
>>>>some other way, as long as it lets me choose data sources, transforms, and
>>>>output format at request time. Can anyone suggest an approach I should 
>>>>look at?
>>>That's not possible, the pipeline setup is the first thing that is done. 
>>>What you can do is to give the control over the pipeline selection 
>>>(read: not setup) to the flow and select dependent on the document type 
>>>the correct pipeline. When using resources you should reach a high level 
>>>of reusability. The dynamic aggregation can be done using CInclude or XInclude.
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