[kepler-users] Kepler Question

[Edward A. Lee]

We have done some experimenting with having multiple workflows running
and communicating in the (underlying) Ptolemy II system.  Yang Zhao made
some Ptolemy II models a few years ago that implemented a distributed
chat application as a concept demo.  But we've never really packaged
up this work...  It would be well worth doing...

Edward


Bertram Ludaescher wrote:
> 
> 
> On Thu, Oct 2, 2008 at 1:27 AM, ted leslie <tleslie at tcn.net 
> <mailto:tleslie at tcn.net>> wrote:
> 
> 
>     I just stumpled upon Kepler and am absolutly blown away!
> 
>     I think it will be very useful for me,
>     but one requirement that I would have is,
> 
>     Can I have workflows interact?
>     Can one trigger another, or start it up?
>     Can they communicate to one another?
>     (maybe even a WF run within a WF?, import a WF as a data provider to
>     another WF?)
> 
> 
> There are several answers to this: First, a workflow running within a 
> workflow is called a "composite actor" or "subworkflow" in our 
> terminology. When one nests a wf inside another one, the question 
> arises: how should this be executed? What's the model of computation. 
> Thanks to Ptolemy's various underlying models of computation, we can use 
> in Kepler different ways of nesting workflows inside one another, all 
> with clear semantics (there are papers and documentation describing how 
> this works).
> 
> Having said this, we normally don't think of multiple instances of 
> workflows as running indepdently and then somehow communicating. 
> Although such a thing is possible (e.g. this *might* be related somewhat 
> to Ptolemy's life cycle models, where one model (aka workflow in Kepler 
> lingo) can start another one), we rather think of workflows typically as 
> data-driven analysis pipelines (dataflow process networks). 
> 
> 
>     Also, I use Linux exclusively, but to avoid Java installs and other
>     prereq.
>     I just put it into a Windows OS on vmware, to give it a quick look.
>     Is the Linux version as full featured as the Windows? (or fuller, or
>     lessor?)
>     (If not what are diffs?)
> 
> 
> I'm not aware of a difference. And you can always get the latest version 
> via the source code repository.
>  
> 
> 
>     These might be very noob questions, and I don't mind  "RTFM",
>     but these are fundimental Q's I would appreacate brief feed back on,
>     (or reference pointers)
>     before I take a much deeper dive in.
> 
> 
> Here is a good starting point:
> http://www.kepler-project.org/Wiki.jsp?page=Documentation
> 
> Bertram
>  
> 
> 
>     Thanks,
> 
> 
>     --
>     ted leslie <tleslie at tcn.net <mailto:tleslie at tcn.net>>
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> 
> 
> 
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