How does job orientation affect the architecture?
Job orientation defines AstroGrid’s architecture. No useful work can be done on AstroGrid (at least via the supported use cases) without building a workflow and submitting a job. The most-important parts of the architecture are the interfaces between the web portal and JES and between JES and the data-handling services. These interface are AstroGrid’s Common Execution Architecture (CEA). Job orientation demands that the system record the specification of each job. CEA is a mechanism for recording those specifications and for passing them to web services. This descriptive power means that all CEA services have the same interface (same WSDL contract) and execution of any workflow, for any astronomical purpose, can be described by the same use case. The differences between jobs show up only inside the portal and inside the CEA services.
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