[kepler-users] kepler interface to JXTA or P2PS

[Christopher Brooks]

VisualSense is based on the Ptolemy sources and can be used for
sensor networks.
http://ptolemy.eecs.berkeley.edu/visualsense/

VisualSense uses the wireless domain, which has some demos.
The wireless domain is part of the full Ptolemy release.

_Christopher
--------


    Hello Yang
    
    Thanks for explaining your experimental
    Corba communication model.  This might
    be a little too heavyweight for my needs.
    
    On a different note, are you aware of any
    Kepler/Ptolemy workflows that were designed
    for the purpose of modeling and obtaining
    simulation timings for high level network
    configurations ?  Are there any researchers
    who are using Kepler/Ptol. for network
    simul. and for getting simulated estimates
    of timing ?
    
    Thanks again for your response on the p-2-p
    issue.
    
    Maurice
    
    
    
    On Wed, 2005-11-30 at 13:00, Yang wrote:
    > Hi Maurice,
    > 
    > There is some work done last year by Thomas and me for distributing a PN 
    > model on a set of nodes. Although we assume there is one master node for 
    > designing, partitioning and distributing a model, after distributed the 
    > execution runs as peer-to-peer, i.e. one node can communicate with anothe
   r 
    > node directly. We used Corba for remote communication. In order to resolv
   e 
    > the communication dependency loop, we adapted the event channel idea: eac
   h 
    > node runs an agent to route messages to the corresponding agent on a remo
   te 
    > node, and the model on a node uses the agent on the same node (could be 
    > some other agent if necessary) to communicate with other models. No 
    > centralized event channel is used though, each agent act as a half event 
    > channel.
    > 
    > Although we didn't use JXTA or P2PS in this work, I feel we share some of
    
    > the design goals. It would also be interesting to see how JXTA or P2PS ca
   n 
    > make the design deferent from above. For example, I think we can get rid 
   of 
    > the agent for routing messages easily when we use JXTA or P2PS for the 
    > underlining discovery and communication.
    > 
    > There is some classes uses JXTA in the Ptolemy tree as Christopher pointe
   d 
    > out in his email. These classes are checked in by me long time ago and I 
   am 
    > not sure it is still compatible with the new JXTA version. There were two
    
    > main applications developed. One application supports peer-to-peer actor 
    > sharing. Another application is probably more interesting in the sense it
    
    > uses JXTA and Corba together: it allows one actor to discover other actor
   s 
    > uses JXTA, the IOR of the discovered actor is encapsulated in a JXTA 
    > message, the discovering actor can get the object reference from the IOR 
    > and do remote method call on the discovered actor. Not sure this 
    > combination is important for practical use. It may be useful when we pref
   er 
    > dynamic discovery and configuration, but prefer synchronous communication
    
    > (like remote method call rather than pipe). Anyway, it was for fun...
    > 
    > I agree with Matt on the JXTA comments. I haven't tried P2PS. Ian Wang 
    > demonstrated it to me in a workshop. It looked cool and much lighter than
    
    > JXTA. I would be happy to know how the programming with it is like if you
    
    > experiment with it.
    > 
    > Cheers,
    > 
    > Yang
    > 
    > At 12:52 PM 11/29/2005 -0900, Matt Jones wrote:
    > >Hi Maurice,
    > >
    > >We have been experimenting with JXTA and Jini in Kepler and Ptolemy, but
    > >at this point the work is largely in the experimental phase.  Daniel
    > >Cuadrado committed some code that allows for an DistributedSDF director,
    > >which can be used to distribute the computations on a set of Jini nodes.
    > >   This isn't fully mature because there is not yet enough control over
    > >what parts of the model are distributed and how the Jini nodes are set
    > >up and configured with Kepler.  But it does work.  You can compile and
    > >run the jini prototype in Kepler using "ant run-jinidev", although it
    > >would probably take some setup beforehand.
    > >
    > >In addition, I did some work on using JXTA to set up peer-to-peer grids
    > >-- it is in CVS but not tied in to the running application.  The JXTA
    > >work is described here:
    > >     http://kepler-project.org/Wiki.jsp?page=PeerToPeerKepler
    > >
    > >We haven't been able to work on this stuff lately due to more pressing
    > >issues in Kepler.  But I do plan to come back to it as soon as possible.
    > >   If you'd like to help out in this regard it would be welcomed.  I
    > >think we will probably drop the JXTA framework as it seems very hard to
    > >program to and somewhat fragile.  We'll have to evaluate other
    > >frameworks (Jini, P2PS, others) to see if they would be better than JXTA
   .
    > >
    > >Cheers,
    > >Matt
    > >
    > >
    > >Maurice Yarrow wrote:
    > > > Hello Kepler users
    > > >
    > > > Is there presently any way to interface
    > > > Kepler to either JXTA or P2PS ?
    > > >
    > > > I.e.: I would like to write autonymous
    > > > cli-servs-peers (have properties of both
    > > > client and server) that can communicate
    > > > with the director of a running Kepler instance.
    > > >
    > > > My goal is not well served by using Web
    > > > Services for a variety of reasons, so
    > > > the above model will allow more flexibility
    > > > for the type of real-time conduct I require.
    > > >
    > > > (Triana supports this but Kepler would be a
    > > > preferred platform for a variety of reasons.)
    > > >
    > > > Also apropos of this issue, what is the status
    > > > of the line item in Alpha 8 (Dec 9 release
    > > > indicated): "initial kepler grid support for
    > > > distributed directory/p2p" ?
    > > >
    > > >
    > > > Maurice Yarrow
    > > >
    > > >
    > > > _______________________________________________
    > > > Kepler-users mailing list
    > > > Kepler-users at ecoinformatics.org
    > > > http://mercury.nceas.ucsb.edu/ecoinformatics/mailman/listinfo/kepler-
   users
    > >
    > >--
    > >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    > >Matt Jones                                   Ph: 907-789-0496
    > >jones at nceas.ucsb.edu                    SIP #: 1-747-626-7082
    > >National Center for Ecological Analysis and Synthesis (NCEAS)
    > >UC Santa Barbara     http://www.nceas.ucsb.edu/ecoinformatics
    > >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    > >_______________________________________________
    > >Kepler-users mailing list
    > >Kepler-users at ecoinformatics.org
    > >http://mercury.nceas.ucsb.edu/ecoinformatics/mailman/listinfo/kepler-use
   rs
    > 
    
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