Grid Service concepts

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Grid Service concepts
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Access restriction to SDEs

• Access to SDEs MAY be subject to policy
  restrictions. This implies, for example
• Some service data elements MAY not be available
  to some clients.
• Some service data value elements within an SDE
  MAY not be available to some clients.
• Two different clients MAY see different service
  data value elements in the same serviceData
  element from the same Grid service instance.

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Service identification

• A GS instance is globally named by a Grid Service
  Handle (GSH) .
• GSH is just a minimal name in the form of a URI,
• not enough information to allow a client to
  communicate directly with the service instance.
• Is valid for the whole lifetime of the instance
• GSH must be resolved to a Grid Service Reference
  (GSR).
• A GSR contains all information that a client
  requires
• It is a WSDL (possible to have different
  bindings, if you implement a custom
  handle-resolver service)
• May become invalid during service instance
  lifetime

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(Taken from OGSA-DAI design Document, by S.Laws
and M.Antonioleti)
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Grid Service Registry States
(Taken from OGSA-DAI design Document, by S.Laws
and M.Antonioleti)
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Grid Service Factory States
(Taken from OGSA-DAI design Document, by S.Laws
and M.Antonioleti)
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Grid Service States
(Taken from OGSA-DAI design Document, by S.Laws
and M.Antonioleti)
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Example Scenario 1 DQP initialisation
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Example Scenario 2 Distributing Evaluator
Instances
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The complete picture
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