[Click] Script element

[Ian Rose]

Jimmy -

I'm not sure if you care, but if you want your Script element to run at 
other times (e.g. when a packet is received, or when a handler is 
called), take a look at the optional TYPE parameter:

http://read.cs.ucla.edu/click/elements/script#script-types

For what its worth, Script(TYPE PACKET, ...) is a nice debugging tool.

- Ian

Cliff Frey wrote:
> First the click configuration is loaded.  This means that all elements are
> created (including all Script elements) and configured and initialized.  At
> this point, the click configuration is considered to be loaded.  Then
> "tasks" are allowed to run.  In your example, the Source element, UnQueue
> element, and Script element all have associated tasks.  Those tasks will
> start running in round-robin fashion.  You cannot really make any
> assumptions about the order of the first instruction in your script vs the
> first action of the Source element, but you can control it if the Source
> starts out disabled.
> 
> For instance
> 
> click foo.click
> 
> foo.click:
> 
> is :: InfiniteSource(LIMIT 1, ACTIVE false) -> Print -> Discard;
> Script(
>   print "script is starting",
>   writeq is.active true,
>   print "script started the source",
>   wait 1.0,
>   print "script is stopping the router",
>   stop);'
> 
> 
> On Thu, Mar 11, 2010 at 10:10 AM, Jimmy <fanyang.scu at gmail.com> wrote:
> 
>> Hi all,
>>
>> I read the script element description and know that it can be used to
>> configure the network. I also used it to implement some simple
>> comfiguration.
>>
>> My question is how and when is this element executed?  Below is a
>> simple example:
>>
>> 1  Source -> Queue -> UnQueue -> Print -> Discard;
>> 2  Script( ... );
>>
>> So line 1 just sets the network and line 2 implements the
>> configuration. Is line 2 executed parallel with line 1? Or is it
>> executed after line 1 is executed?
>>
>> Thanks.
>> --
>> Best Regards,
>>
>> Jimmy
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>>
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