[Click] Elements handlers

[Beyers Cronje]

Hi Rafael,

A standard Write handler should do the trick. Just pass the argument the your "routes" handler and do the neccesary lookups inside your handler routine and return the results.

Beyers

-----Original Message-----
From: click-bounces at amsterdam.lcs.mit.edu
[mailto:click-bounces at amsterdam.lcs.mit.edu]On Behalf Of Rafael
Paoliello Guimaraes
Sent: Friday, March 11, 2005 2:31 PM
To: Marko Zec
Cc: click at amsterdam.lcs.mit.edu
Subject: Re: [Click] Elements handlers


Ok, I know this. I have done this with read handlers and write 
handlers... I have even read that if I want a read/write handler, I 
should register two handlers with the same name, one for write and one 
for read. But my case is different. I want to register a handler that is 
read and write at the same time. For example, in the LinearIPLookup 
table there is a read handler called "table" that simply returns the 
routing table. Well, suppose I wanted to provide an additional handler 
(routes) that given a destination address, would return the entries on 
the routing table that could be use to route data to this address... How 
thid could be done?

Example:

if the routing table is:

DST           OUT
10.0.2.0/24   1
20.7.4.0/24   2
10.0.0.0/16   1

if I called this new handler like this: routes(10.0.2.1)
it would return me the following string:

10.0.2.0/24   1
10.0.0.0/16   1

Is it possible to be implemented (or is there any alternative way to do 
this), or would I have to modify the Element class?

Cheers,

===========================================
  Rafael Paoliello Guimaraes
  PhD Student - Computer Networking Group
  Department of Computer Architecture (DAC)
  Polytechnic University of Catalonia (UPC)
  Phone: +34-934017187   Fax: +34-934017055
  URL: http://people.ac.upc.es/rpaoliel
===========================================


Marko Zec wrote:
> On Thursday 10 March 2005 21:22, Rafael Paoliello Guimaraes wrote:
>>Hi,
>>
>>I am writing some new Click elements and I have a doubt concerning
>>the handlers of an element. I have seen read handler and write
>>handlers implemented, but I have not seen any read/write handler. Is
>>there this possibility? I want the handler to return me a string
>>based on some arguments I introduce.
>>
>>I have implemented the following handler:
>>
>>String
>>MyElement::thehandler_handler(const String &conf_in, Element *e, void
>>*thunk, ErrorHandler *errh)
>>
>>
>>But I don't know how to add it to the element? Is this right? How
>>should I do it?
> 
> 
> The Element class provides the add_handlers() virtual function which you 
> may override to explicitely export custom handler hooks.  Just grep 
> through existing elements for add_handlers...
> 
> Marko
> 
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