Discovering RequestHandler parameters at runtime

[Grant Ingersoll <gs...@apache.org>]

Hi,

Is there anyway to interrogate a RequestHandler to discover what  
parameters it supports at runtime?  Kind of like a BeanInfo for  
RequestHandlers?  Has anyone else thought about doing this and what it  
might look like?  Seems like it would be useful for building dynamic  
web forms.

Thanks,
Grant

Re: Discovering RequestHandler parameters at runtime

[Chris Hostetter <ho...@fucit.org>]

: > Is there anyway to interrogate a RequestHandler to discover what parameters
: > it supports at runtime?  Kind of like a BeanInfo for RequestHandlers?  Has

: Also, check:
: http://wiki.apache.org/solr/MakeSolrMoreSelfService

Yeah, that wiki is as far as i ever got.  note that it vastly predates a 
lot of the LukeRequestHandler type stuff and even the general additude of 
moving more towards RequestHandlers as general processing units of solr 
for handling all requests (even admin style requests)

Note that while it might be handy to have something like BeanInfo where 
the *class* tells you what params it supports, the important feature would 
be something where the *instance* tells you what params it supports, 
because it won't want to advertise params that it has invariants set for.  
(i touch on this in that wiki)

Ultimatley i think it would be good if RequestHandlers implemented a 
method that returned a big data structure containing everything they 
wanted to "advertise" about themselves. and most of the admin screen and 
the "form.jsp" in the current codebase got replaced by a 
"FormRequestHandler" that would inspect the SolrCore for a list of all 
RequestHandlers that were advertising themselves and create forms for 
them.

-Hoss

Re: Discovering RequestHandler parameters at runtime

[Ryan McKinley <ry...@gmail.com>]

Grant Ingersoll wrote:
> Hi,
> 
> Is there anyway to interrogate a RequestHandler to discover what 
> parameters it supports at runtime?  Kind of like a BeanInfo for 
> RequestHandlers?  Has anyone else thought about doing this and what it 
> might look like?  Seems like it would be useful for building dynamic web 
> forms.
> 

currently there is not...  I started down that route a while ago, but 
got distracted by other things.  I think its a good idea.

Also, check:
http://wiki.apache.org/solr/MakeSolrMoreSelfService

ryan