[glue-wg] Dependencies among Application Environments

[Sergio Andreozzi]

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
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