[kepler-dev] what's the CHANNEL in kepler

[Matt Jones]

Yes, that is true.  The channel number is scoped per port, and so each port
will start with channel 0 and increment up from there.

Matt


On Thu, Jul 31, 2014 at 7:09 PM, 陈军 <jam.chenjun at gmail.com> wrote:

> Since there‘s so many repeated values in the channel field, I guess
> channel is unique between ports, but not unique in the large?
>
>
> 2014-07-31 23:07 GMT+08:00 Matt Jones <jones at nceas.ucsb.edu>:
>
> Channels are the connections between ports.  A multiport can have multiple
>> channels attached, which are numbered starting at 0. So the database field
>> holds those values.
>>
>> Matt
>> On Jul 31, 2014 8:01 AM, "陈军" <jam.chenjun at gmail.com> wrote:
>>
>>>  hi,
>>>
>>> "
>>> https://kepler-project.org/developers/interest-groups/provenance-interest-group/interfaces-to-provenance-for-reap/?searchterm=schema
>>> "
>>> In this web page, there is the provenance database schema. In the
>>> *port_event* table, there is a field *channel*.
>>>
>>> "
>>> https://code.kepler-project.org/code/kepler/trunk/modules/provenance/docs/provenance.pdf
>>> "
>>> In this document, there is an explanation. "A port event occurred at
>>> *time*, on port *port_id*, and on *channel* from actor firing *fire_id*
>>> ."
>>>
>>> I thought channel means that data flow path between actors.
>>> But after I execute several different workflows and record the
>>> provenance data and check the hsql provenance. I find that in the 48 lists
>>> of *port_event* row, 47 lists of the *channel* field is 0, and the rest
>>> list of the *channel* field is 1. Seems that my thought wrong.
>>>
>>> So what's the channel in kepler provenance?
>>> (Maybe channel is used by the underlying ptolemy sending tokens, but not
>>> utilized by the kepler provenance module?)
>>>
>>> --
>>> 陈军
>>> School of Computer Science , Fudan University
>>>
>>> _______________________________________________
>>> Kepler-dev mailing list
>>> Kepler-dev at kepler-project.org
>>> http://lists.nceas.ucsb.edu/kepler/mailman/listinfo/kepler-dev
>>>
>>>
>
>
> --
> 陈军
> School of Computer Science , Fudan University
>
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