Thoughts on the e-Science Mediator in myGrid

M.Nedim Alpdemir

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Results of the experiment to be added here when WF executed

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e-Science Mediator: Motivation• Many e-Science processes requires the

composition of more than one myGrid component

• To Deliver myGrid as a service we need a gateway (Façade) to all myGrid components

• Simplify interdependency, increase de-coupling between myGrid components

e-Science Mediator: aims1. Application-oriented: directly supports the e-

Scientist by: • providing pre-configured e-Science processes templates (i.e.

system-level workflows)• helping in capturing and maintaining context information (via the

information model) that is relevant to the interpretation and sharing of the results of the e-science experiments.

• Facilitating personalisation and collaboration

2. Middleware-oriented: contributes to the synergy between myGrid services by:

• Acting as a sink for e-Science events initiated by myGrid components• Interpreting the intercepted events and triggering interactions with

other related components entailed by the semantics of those events• Compensating for possible impedance mismatches with other

services both in terms of data types and interaction protocols

Supporting the e-scientist

• Recurring use-cases can be captured

• Then corresponding process templates can be authored

• e-science mediator makes processes available to the user

launch semantic Search facility

Find WorkflowUse-case

Launch workflowEditor for selected WF

Enable MIR browser For storage with context

Find an interesting workflow for experiment

Create exp. Context for this user

Find WorkflowProcess

Examine and modify if necessary

Store to personal repositoryFor later re-use

Mediator Roles - 1

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Whenever a workflow is run using some data, the owner of the data being used can be informed (notified) about it

Mediator Roles - 2

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Whenever data is removed that was previously used, a notification message may be sent to the person who used that data, informing him/her of impending deletion.

Mediator Roles - 3

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If a workflow is deleted that was used by a particular person, the person may want to be notified of the deletion.

Fully Service-based approach

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Portal approach: mixed mode

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