In order to maintain flexibility in the system, three kinds of
Figure 4. Delegation flow in GateService
Lee
Copyright ?© 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission
of Idea Group Inc. is prohibited.
SSO service invocations are provided. The first method is that the user manually sets up
identities to use for the next service invocation in the task itself. This is the same method of
invocation as in WSGrid. The second method is inheritance, for those whose current identity
should remain in use in the following invocation. The last method is to allow the service to
automatically pick up a proper token for the specified node used in the next invocation.
By using ???Single Sign-On??? service, the user is allowed to submit tasks to different nodes at
different times of execution without modifying the code.
Adaptable Configuration
Configuration Service is used because of the distributed environment. In the original design
of WSGrid, all the spaces/nodes are distinct, even though they might have the same owner.
Hence, a difficulty arises when a user wants to set up the same configuration or have the
same delegation on different spaces/nodes.
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