Hello,
The provenance capture in T2 captures 'everything' that happens when
workflows are invoked. The events that flow through your workflow are
captured as ProvenanceItems and sent across to the
ProvenanceReporter/Provenanceconnector plugin for processing. It is here
where you can change what happens to these events.
You would need to create your own ProvenanceConnector, have a look at the
DerbyProvenanceConnector in the SVN for ideas and also how to plugin your
own. It's really just a case of subclassing ProvenanceConnector and
overriding the addProvenanceItem method. You will also need the magic SPI
files in src/main/resources/META-INF/services to make sure your version can
be found by taverna. Taverna creates them through a factory so you also
need to create that class.
Cheers,
Ian
2009/10/12 Alan Williams <[email protected]>
> Girish Subramanian wrote:
> > Hi all,
>
> Hello,
>
> > I am planning to write a provenance plugin for Taverna.
>
> Have you looked at the provenance capture that is already in Taverna?
> In 2.1 beta 2 the information about the run is captured in a database
> and it is this data which is used to produce the "intermediate results"
> information.
>
> For 2.1, Paolo Missier, Ian Dunlop and Stuart Owen have been working on
> improving the provenance capture. This includes OPM support and an API
> to allow out-of-Taverna access to the provenance data.
>
> > I have the following
> > questions :
> >
> > 1. The SVN repository that I am using is
> > http://taverna.googlecode.com/svn/taverna/ . I guess this is the latest
> > ones. Please correct me if I am wrong.
>
> Yes, that is the code repository.
>
> > 2. For my provenance collection part I need some callback mechanism which
> > gets invoked , before invoking or executing any of the nodes in the
> > workflows. Do we have such a framework built in Taverna engine, else what
> is
> > the work around ? Can someone guide me through the classes that I should
> > look into to get this done .
>
> The relevant packages are under net.sf.taverna.t2.provenance.
> net.sf.taverna.t2.provenance.lineageservice.Provenance takes events and
> passes them to net.sf.taverna.t2.provenance.lineageservice.EventProcessor
>
> You would probably want to implement your own EventProcessor. Paolo and
> Ian can give more details.
>
> > 3. Is there any documentation which points out how to create a new plugin
> > for tavern.
>
> There will be archetypes available, certainly for activity plugins, for
> 2.1.
>
> > Thanks,
> > Girish Subramanian
>
> Alan
>
>
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--
Ian Dunlop
myGrid Team
School of Computer Science
University of Manchester
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Come build with us! The BlackBerry(R) Developer Conference in SF, CA
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ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
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