[kepler-users] branch the workflow

[Bertram Ludaescher]

Yes, SDF requires fixed token production/consumption rates which doesn't go
well with "conditional execution" / "data-dependent routing" of tokens.
There's also the  September 2008 Kepler
Newsletter<https://kepler-project.org/users/newsletter/2008-09-kepler-news.pdf>
 which explains this use case.

Here's a part of it (partial; get the newsletter for the rest):

[image: 2011-02-12_1359.png]

Bertram


On Thu, Feb 10, 2011 at 2:01 PM, Christopher Brooks
<cxh at eecs.berkeley.edu>wrote:

> Hi Hao,
> See:
>
> http://ptolemy.eecs.berkeley.edu/ptolemyII/ptII8.0/ptII/doc/codeDoc/ptolemy/backtrack/automatic/ptolemy/actor/lib/BooleanSwitch.html
>
> "Note that the this actor may be used in Synchronous Dataflow (SDF) models,
> but only under certain circumstances. Specifically, downstream actors will
> be fired whether a token is sent to them or not. This will only work if the
> downstream actors specifically check to see whether input tokens are
> available."
>
> Models that have branches that can change during execution are
> not usually SDF because the number of tokens can change during
> execution.  SDF statically schedules the firing of tokens
> depending on the number of tokens produced or consumed.
>
> Try using DDF.
>
> Try searching the net and groups for BooleanSwitch, see
> https://kepler-project.org/users/faq#the-booleanswitch-actor-is
>
> _Christopher
>
>
> On 2/10/11 12:46 PM, Hao Qian wrote:
>
>> Hi,
>>
>> Under the SDF director, how to branch the workflow according to some
>> condition, like an “if – else –“ statement? There is a “Boolean Switch”
>> actor, but the document says it cannot be used under SDF
>> director.
>>
>> Thanks!
>>
>> Hao
>>
>>
>>
>> _______________________________________________
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>> Kepler-users at kepler-project.org
>> http://lists.nceas.ucsb.edu/kepler/mailman/listinfo/kepler-users
>>
>
> --
> Christopher Brooks, PMP                       University of California
> CHESS Executive Director                      US Mail: 337 Cory Hall
> Programmer/Analyst CHESS/Ptolemy/Trust        Berkeley, CA 94720-1774
> ph: 510.643.9841                              (Office: 545Q Cory)
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