[Click] Elements handlers
Rafael Paoliello Guimaraes
rafael.guimaraes at ac.upc.edu
Fri Mar 11 08:24:07 EST 2005
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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