OGSA Common Services

Beyond defining the OGSA service model, the OGSA specification defines a set of PortType's which have proven useful in ``production Grid environments,'' though such birds are rare to come by these days. The full set of OGSA PortType's defined in the OGSA specification are as follows:

• HandleResolver - A PortType which is used to find the WSDL describing GridService's.
• NotificationSource - A PortType which is used to broadcast any information of interest.
• NotificationSink - A PortType which is used by services which subscribe to NotificationSource's broadcasts.
• NotificationSubscription - A PortType which is used to manage how long a NotificationSink subscribes to a NotificationSource and to find out information about its subscription.
• Factory - A PortType which is used to create other GridService's.
• ServiceGroup - A PortType which is used to maintain information on groups of GridService's.

Each of these services is also a GridService, thus has all the findServiceData, setServiceData, requestTerminationAfter ...operations.