[Click] Elements handlers

[Beyers Cronje]

Hi Rafael,

So I presume you want an element to call the handler, and not just access the handler via /proc/click ?

What I've done in the past is just add a standard class interface, in your case "routes". During configuration phase gain a pointer to your LinearIPLookup element via upstream_elements downstream_elements or via a configuration option. Then call the "routes" interface directly when needed.
I'm not sure if this is the "Click" way of doing things but it works for me.

Beyers

-----Original Message-----
From: Rafael Paoliello Guimaraes [mailto:rafael.guimaraes at ac.upc.edu]
Sent: Friday, March 11, 2005 3:24 PM
To: Beyers Cronje
Cc: click at amsterdam.lcs.mit.edu
Subject: Re: [Click] Elements handlers


Ok... But this will just print the result. And I want to return the 
result, not to print it. Just like what it is done by read handlers... 
But the only difference with respect to read handlers is that I want to 
pass some arguments to this handler.

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
===========================================


Beyers Cronje wrote:
> PS When I say "return the results" I meant via click_chatter().
> 
> -----Original Message-----
> From: Beyers Cronje 
> Sent: Friday, March 11, 2005 3:09 PM
> To: 'Rafael Paoliello Guimaraes'
> Cc: click at amsterdam.lcs.mit.edu
> Subject: RE: [Click] Elements handlers
> 
> 
> 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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