Completion event when the OmmState is having data state as SUSPECT and stream state as OPEN

Hi Team,

We are upgrading our application to use EMA API from RFA API.

Our question is that in case of RFA API, do we get any COMPLETION EVENT in the case when Data State of response message is SUSPECT and Stream State is OPEN.

Similar question we have for EMA API as well. When the data state of message is SUSPECT and Stream State is OPEN then do we get any subsequent response which is equivalent to COMPLETION_EVENT.

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Accepted answers

Jirapongse

@dimple.shah

Thank you for reaching out to us.

There is no COMPLETION_EVENT in EMA. The client can check the stream state, such as CLOSED to verify the status of the stream.

Moreover, the COMPLETION_EVENT in RFA is used to determine the point at which RFA closes an event stream. There are two ways in which an event stream can be closed:

The application closes the stream via unregisterClient() call to RFA. In this case, RFA might dispatch additional events that were in flight due to race condition.
The application receives an event that closes the stream.

Therefore, it is about the closed stream state, not open stream state.

All comments

Jirapongse

@dimple.shah

Thank you for reaching out to us.

There is no COMPLETION_EVENT in EMA. The client can check the stream state, such as CLOSED to verify the status of the stream.

Moreover, the COMPLETION_EVENT in RFA is used to determine the point at which RFA closes an event stream. There are two ways in which an event stream can be closed:

The application closes the stream via unregisterClient() call to RFA. In this case, RFA might dispatch additional events that were in flight due to race condition.
The application receives an event that closes the stream.

Therefore, it is about the closed stream state, not open stream state.

dimple.shah

My follow up question is that in case of RFA API when we get DataState as SUSPECT, and Stream State is OPEN then will the stream remain open or will we get any completion event.

As per the following logs we think we are getting the COMPLETION_EVENT in case of SUSPECT/OPEN state, but we want to confirm once.

Apr 24 2024 05:30:31 realtime::NVSnapshotSession-eventQueue1 WARN .dss.ds.rfa.omm.OMMPriceClient [] - RIC 300010.SZ/SNAPSHOT/SECURITY is STALE OPEN, SU

SPECT, TIMEOUT, "Item Request Timeout"

Apr 24 2024 05:30:31 realtime::NVSnapshotSession-eventQueue1 WARN .dss.ds.rfa.omm.OMMPriceClient [] - RIC 300010.SZ/SNAPSHOT/SECURITY is STALE OPEN, SUSPECT, NONE, "No connection or service is currently up that supports this request."

Apr 24 2024 05:33:26 realtime::NVSnapshotSession-eventQueue1 INFO .dss.ds.rfa.omm.OMMPriceClient [] - Received a COMPLETION_EVENT for 300010.SZ/SNAPSHOT/SECURITY

Apr 24 2024 05:33:26 realtime::NVSnapshotSession-eventQueue1 INFO .dss.ds.rfa.omm.OMMPriceClient [] - Will unsubscribe 300010.SZ/SNAPSHOT/SECURITY because it is a SNAPSHOT subscription

Jirapongse

@dimple.shah

If the Stream State is OPEN, it means that the stream remains open.

The application will get the COMPLETION_EVENT when:

The application closes the stream via unregisterClient() call to RFA. In this case, RFA might dispatch additional events that were in flight due to race condition.
The application receives an event that closes the stream.

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