[Click] Doubt about information elements

[Eddie Kohler]

Hi Pedro,

> I am implementing RIP support for Click.

Great!  We'd love to distribute it when you're done.

> And i have a problem: I want to make the manage of the routing table  
> independent from RIP elements, so, it could be accesed by two or more  
> elements (Maybe one "RIP core" and the other "lookup routes"). I don't  
> know how no-element classes work so i cannot make Routing table  
> static. I have read something about information elements but i don't  
> understand how it can help me.

Hm.  Well, first, I'd expect the routing table to be encapsulated in an  
element.  So do you really want a no-element class?

I can point you at a couple information elements:
- PortInfo (one of the simplest ones)
- PerfCountInfo
Maybe looking at these will help you get a feel for the style.

Now, if you want to just figure out how to get Click to include a .cc  
file that doesn't contain an element, that's simple.  Add  
ELEMENT_PROVIDES(SomeIdentifierForYourFile) to the bottom of the .cc  
file.  Make sure you add ELEMENT_REQUIRES(ThatIdentifier) to any other  
elemnents requiring that code.  See userlevel/fakepcap.cc for an  
example.

Does this help?
Eddie


>
> At this moment RIP core makes both actions, but this solution is not  
> extensible and i don't like it.
>
> Any ideas or help will be very wellcome.
>
> Sorry about my english.
>
> Pedro Menchen
> student at University of Coruña
>
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