is prohibited.
organizations, and a user (the task submitter) usually holds many credentials as identities.
???Single Sign-On??? is the capability to allow the user to be authenticated as a member once,
and then retain valid membership for a long time. It is rather important in WSGrid, because
the virtual organization is formed by nodes and users, and the relationships are multiple.
Therefore, a user might hold different identities and security tokens within different nodes.
To invoke services on nodes, the caller needs to be authenticated on behalf of the user, and
so needs a proper identity. The users in WSGrid can be authenticated manually. Therefore,
the user must stay on line as long as the task is running. Alternatively, he can also manually
set up his identities immediately before the service invocation or task submissions, for
instance, using:
Change dent ty to (token@ )
Subm t_task (job ) to Node
The ???Single Sign-On??? service of GateService provides another solution to this problem. A
preparative function to be done is identities federation. This function associates the proper
identities and security tokens with the corresponding node, such as using:
Id_Federat on(token@ , Node )
After the federation of identities, the service is able to pick up the proper security token
for every service invocation.
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