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 <[email protected]> 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 <[email protected]>: > > 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" <[email protected]> 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 >>> [email protected] >>> http://lists.nceas.ucsb.edu/kepler/mailman/listinfo/kepler-dev >>> >>> > > > -- > 陈军 > School of Computer Science , Fudan University >
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