5.11 Condition Refresh related Events

5.11.1 Overview

Following are sub-types of SystemEventType that will be generated in response to a Refresh Methods call. They are illustrated in Figure 25.

5.11.2 RefreshStartEventType

This EventType is used by a Server to mark the beginning of a Refresh Notification cycle. Its representation in the AddressSpace is formally defined in Table 133.

5.11.3 RefreshEndEventType

This EventType is used by a Server to mark the end of a Refresh Notification cycle. Its representation in the AddressSpace is formally defined in Table 134.

5.11.4 RefreshRequiredEventType

This EventType is used by a Server to indicate that a significant change has occurred in the Server or in the subsystem below the Server that could or does invalidate the Condition state of a Subscription. Its representation in the AddressSpace is formally defined in Table 135.

When a Server detects an Event queue overflow, it shall track if any Condition Events have been lost, if any Condition Events were lost, it shall issue a RefreshRequiredEventType Event to the Client after the Event queue is no longer in an overflow state.