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To simplify the work in gathering the common data required to create a PortalEvent the IPortalEventFactory interface defines APIs for publishing each type of event. As new events are added new methods should be added to this interface to publish each even type.
PortalEvent Persistence
As a method of gathering statistics about the portal and serving as an audit log uPortal comes with a service that stores all PortalEvents to a database. Events within a uPortal instance are queued and asynchronously flushed to the database once per second.https://wiki.jasig.org/display/UPC/Portal+Events