This use case can easily be handled by letting the module (or the necessary setup script for the application) set up the needed environment for the job. I think we can safely assume that all the needed applications will also be installed by the sys admin if he/she wants to get software A1 working. One example I can think of is the BEAST application used by our bioinformatics users. It's an application written in Java and requires that the java module also gets loaded when the beast module is loaded. On Wed, Mar 12, 2008 at 7:00 PM, Sergio Andreozzi < sergio.andreozzi@cnaf.infn.it> wrote:
Dear all,
I got a new use case for the Application Environment from Tibor Kalman (working on InstantGrid). He would like to be able to discover if an Application Environment depends on other Application Environments in order to be used.
Let's say that in a ComputingService, you have three installed application environments (which LocalID are AE1, AE2 and AE3). It could happen that a user wants to use AE1 for its job, but this will imply that AE1 has to use AE2 and AE3. The scheduler should be able to discover this in order to correctly submit the job.
The dependency can be captured by referring to the LocalID of the application on which another application depends on.
The questions are:
1. is there anybody else who has this requirement?
2. how could we model this in GLUE?
option a. add directed association from Application Environment to Application Environment which with label "Depends On" option b. add multi-value Dependency attribute to Application Environment class (basically an implementation of the association in option a.) option c. suggests usage of auxiliary entities
Please, send your comments on this issue.
Cheers, Sergio
-- Sergio Andreozzi INFN-CNAF, Tel: +39 051 609 2860 Viale Berti Pichat, 6/2 Fax: +39 051 609 2746 40126 Bologna (Italy) Web: http://www.cnaf.infn.it/~andreozzi<http://www.cnaf.infn.it/%7Eandreozzi>
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