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From Vadim Gritsenko <va...@reverycodes.com>
Subject Re: [RT] Virtual Sitemap Components
Date Wed, 21 Jul 2004 15:23:26 GMT
Sylvain Wallez wrote:

> Reinhard Poetz wrote:
>
> <snip/>
>
>> I have the same understanding after reading the whole thread. Though 
>> I'm not sure if we have consensus on actions. Anyway, what will be 
>> the order of execution of actions? IIUC all actions within a pipeline 
>> are execute *before* the pipeline is executed, aren't they? Will this 
>> behaviour remain?
>> Another question: Is this order of execution of actions by design and 
>> if yes, what's the reason?
>
>
>
> Hey Reinhard, back to basics! Actions are in the "control structure" 
> category, alongside match and select. So they must be executed first, 
> just as matchers and selectors, as their result is used to decide 
> which components are included in the pipeline.
>
> The problems of actions is that they are more than control structures 
> as they are allowed to modify the system state, or perform a redirect, 
> which is not what the pipeline instructions (<map:generate> 
> <map:transform> etc) are doing today. That's why actions may be 
> forbidden in VPCs, except maybe for virtual readers.


Any Action can be re-written as a Matcher in 10-15 seconds (only 
exception is this redirect mentioned above... shall we remove redirector 
from action interface? ;-) ). Thus, I totally miss the point why actions 
should be disallowed.

Vadim


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