| Previous | Table of Contents | Next |
The session is an interface inherited by data access and alarms & events sessions. A session represents a single conversation
with the DAIS service. A session has a connection to a shut down callback used by a server to shut down clients in the case
of an ordered shut down of the server. If the session object is destroyed or a failure is detected by the server when invoking
an operation on any callback objects, then the session is terminated.
A session object corresponds to the OPC server object; hence each OPC server object will be represented by a session object
in DAIS.
Figure 3-5 DAIS session IDL in UML
The status() method corresponds to the read only SessionStatus attribute in the IDL. The callback() get and set methods correspond
to the ShutDownCallback attribute.