[Click] Accessing element handlers from within a click script

[Peter De Cleyn]

Hi David,
You can certainly pass a handler as a parameter to an another element. This
is well documented in the handlerCall reference in
http://www.read.cs.ucla.edu/click/doxygen/classHandlerCall.html. Look for
the HandlerCall Objects section. An example  is given how to parse and call
a handler.

Regards,

Peter

Peter De Cleyn

IBBT - PATS research group
Dept. of Mathematics and Computer Sciences
University of Antwerp
Campus Middelheim, G3.26
Middelheimlaan 1
B-2020 Antwerpen, Belgium
Phone: +32 (0)3 265.33.64
Fax: +32 (0)3 265.37.77
Web: www.pats.ua.ac.be/peter.decleyn

On Fri, Aug 7, 2009 at 2:15 PM, david johnson <david.lloyd.johnson at gmail.com
> wrote:

> Hi
>
> I've got the following example code in which I'm continuously scanning
> for beacons and storing the results in bs.scan. I then want to send the
> results of the scan to other nodes in the network when I get a certain
> request message.
>
> To do this I need to access the BeaconScanner handler "scan". I'm new to
> click and maybe I'm breaking some fundamental rule in a click config
> script but is it possible to pass an element handler as a parameter to
> another element.
>
> I need to do it at this point in the code:
> 25   -> send_scan_results(### pass bs.scan handler to element ###)
>
> Thanks
> David
>
> =========================================
>
>  1 control :: ControlSocket("TCP", 7777);
>  2
>  3 rates :: AvailableRates(DEFAULT 2 4 11 22);
>  4
>  5 FromDevice(ath0, PROMISC true)
>  6   -> RadiotapDecap()
>  7   -> c1 :: Counter
>  8   -> wifi_cl :: Classifier(0/00%0c, /mgt
>  9       0/08%0c, /data);
>  10
>  11 wifi_cl [0] -> Classifier(0/80%f0)
>  12     -> c2 :: Counter
>  13     -> bs :: BeaconScanner()
>  14     -> Discard;
>  15
>  16 wifi_cl [1]
>  17   -> WifiDecap()
>  18   -> cognitive :: -> Classifier(//some String 1,
>  19       // Some String 2,
>  20       // Some String 3,
>  21       );
>  22
>  23 // Respond to Get beacons stored in node
>  24 cognitive [0]
>  25   -> send_scan_results(### pass bs.scan handler to element ###)
>  26   -> q;
>  27
>  28
>  29 q :: Queue(10)
>  30 -> wep_encap :: WepEncap(ACTIVE false)
>  31 -> set_rate :: SetTXRate(2)
>  32 -> rate :: ProbeTXRate(OFFSET 4,
>  33            THRESHOLD 0,
>  34            WINDOW 10000,
>  35            RT rates)
>  36 -> SetTXPower(63)
>  37 -> extra_encap :: ExtraEncap()
>  38 -> to_dev :: ToDevice (ath0);
>
>
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