Ilkay
First of all thank you for your answer, but I have some questions about your suggestion. -Did you suggest that I develop new actors or there is some kind of actors in Kepler, ready to use, with the functionality (task-assigner; Check-Task) that you have proposed? -On Check Task1 are you suggested I call a web service that only responds when K-1 result is available? -After I sent my previous message I have tried kepler to invoke Web services but I found many limitations. First The Web Service actor only works with simple data types and it don?t support asynchronous calls and callbacks, a easy way to solve my problem: task3 will be notified on completion of task4(K-1). I appreciate If you can give me more some help Thanks Luis -----Original Message----- From: Ilkay Altintas [mailto:[email protected]] Sent: quarta-feira, 13 de Junho de 2007 1:28 To: Luis Assun??o Cc: Kepler-users at ecoinformatics.org Subject: Re: [kepler-users] Workflow with instances dependency Luis, You can have a workflow the has the instances of web services for item K of your simulation under PN or SDF (given n below is known before scheduling) and has monitoring actors (check and get results if necessary) for the tasks in item K-1. So assuming that your Task 1 through 4 depends also on each other and there are n items, one way to model it is: Check Task1(K-1) Check Task4 (K-1) | | V V K-Assigner(0..K..n) -> Task1 (K) -> Task2 (K)-------------- -> Task3 (K) -> Task4 (K) K-Assigner will keep assigning the new items as the item before is processed. In this way, you can model it using web services as only web services for one item will be used at one time. If you do this in PN, you might end up having thousands of web services at the same time for Task 1, but you can get around it by limiting it in the workflow by the K-Assigner actor. There might be more efficient ways of doing the same thing by keeping two instances running at the same time using PN. Something like below, but the one below won't work. K-Assigner(0..K..n) -> Task1 (K-1) -> Task2 (K-1) -> Task3 (K-1) -> Task4 (K-1) | | | | V V -> Task1 (K) -> Task2 (K) ------------------------> Task3 (K) -> Task4 (K) Hope you get the illustrations correctly... -ilkay On Jun 6, 2007, at 5:44 PM, Luis Assun??o wrote: Hi In my current research I have to modulate a simulation where I have thousands of input items and for each item I have the following workflow. Task1 ->Task2->Task3->Task4 But Task2 of item K depends of the completion of Task1 from item K-1 and Task3 of item K depends of the completion of Task4 from item K-1 I am interested to use modeling based on Workflows and I am also interested to support task execution as a Web Service. I am tried to modeling using Kepler with Web Service actor but I think it isn?t suitable to describe an workflow with thousand of instances (huge graphical boxes) and worst I don?t know the best way to describe task execution with dependencies from previous execution? Can someone advise me about what is the best pattern to this case? I appreciate in advance some advising. Many thanks Luis Assuncao Email: lass at isel.ipl.pt _______________________________________________ Kepler-users mailing list Kepler-users at ecoinformatics.org http://mercury.nceas.ucsb.edu/ecoinformatics/mailman/listinfo/kepler-users -- Ilkay ALTINTAS Lab Director, Scientific Workflow Automation Technologies (SWAT) San Diego Supercomputer Center(SDSC), UCSD 9500 Gilman Drive, MC: 0505 La Jolla, CA 92093-0505 phone: (858) 822-5453 fax: (858) 534-8303 web: <http://users.sdsc.edu/%7Ealtintas> http://users.sdsc.edu/~altintas -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mercury.nceas.ucsb.edu/ecoinformatics/pipermail/kepler-users/attachments/20070613/59f91a33/attachment.htm
