[kepler-dev] SampleDelay Actor Query

[Jianwu Wang]

Hi Subhav,

     I'm not familiar with Sample Delay Actor. Maybe some one else can help.

     About your workflow pausing until some condition is met. It seems 
to me that you can use 'Boolean Switch' to do it. Let the false branch 
be connected to its input, so that the 'Boolean Switch' actor will wait 
for another condition if the current condition is false. The true branch 
will be connected to the sub-workflow you want to execute.

     I attached a sample workflow using  'Boolean Switch' and 
'Interactive Shell' actor. Yet one weird phenomena of its execution is 
that the output is according to the previous input in 'Interactive 
Shell', not the current one. I'll keep digging it.

Best wishes

Sincerely yours

Jianwu Wang
jianwu at sdsc.edu
http://users.sdsc.edu/~jianwu/

Scientific Workflow Automation Technologies (SWAT) Laboratory
San Diego Supercomputer Center
University of California, San Diego
San Diego, CA, U.S.A.


On 4/4/2010 5:15 PM, subhav mital wrote:
> Alternatively, is there any actor that "pauses" the workflow until 
> some condition is met?
>
> ie. Similar to a flag value which upon getting reset (0), halts the 
> workflow and upon getting set (1) resumes the workflow.
>
> Thanks.
>
>
> On Sun, Apr 4, 2010 at 8:09 PM, subhav mital <mital.subhav at gmail.com 
> <mailto:mital.subhav at gmail.com>> wrote:
>
>     Hi,
>
>     I wish to use the Sample Delay Actor but am confused how is it
>     used to resolve deadlocks? Please let me know if there is any
>     sample demo of this?
>
>     Moreover, the documentation of interactive shell actor states:
>     "The actor is typically preceded by a SampleDelay actor, which
>     provides an initial welcome message or instructions"
>
>     Any explanation on how to incorporate these welcome messages?
>
>     Thanks...
>
>
>
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