suggestion: RequestProcessor hooks/plugins instead of subclassing?

[ll]

Here's a thought, and I couldn't find any evidence in the list archives 
of this being discussed before. There are many good reasons to extend 
RequestProcessor, but of course it's not possible to use more than one 
RequestProcessor subclass at a time (unless they extend each other), 
and there seems to be an issue with multiple conflicting 
RequestProcessor subclasses-- I can think of several open source struts 
add-ons that do this, plus of course TilesRequestProcessor, and I can't 
use them all together. Plus, I have extended RequestProcessor myself 
(to provide custom access control).

But what if there were a plug-in interface for RequestProcessor to 
provide extra functionality, instead of overriding methods? Then you 
could combine an arbitrary number of per-request customizations. Maybe 
this is complicated because the RequestProcessor interface is quite 
large, and I'm sure there will always still be *some* reason to extend 
RequestProcessor, but I'm sure most people just override a few common 
methods like processPreprocess(), processRoles(), etc., so at least 
this might take care of 90% of the cases.

Any thoughts on this? Perhaps this should be posted to the struts 
developer list instead... but I thought I'd see if it gets shot down 
here first :)

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