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From DCAE side, analytics (TCA) writes the events to Policy. Which topic to use is configurable, set within the "preferences" that sent to TCA. For R1 and R2, the topic DCAE writes to for sending events to Policy is an anonymous topic: unauthenticated.DCAE_CL_OUTPUT.
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I'm exploring the policy code to check the event handling and policy distribution.
What I understand by static analysis is that dmaap polls PDP to get the latest policies that are distributed if any and maintains the configurations there.
When an event occurs, it writes to dmaap expecting the policy to get the event information.
I want to know which particular component(BRMS gateway/any other) in policy starts a listener thread to get the event notification. What I found is there is AutoClientDMAAP in BRMS project which listens on topic PDPD-CONFIGURATION. But I guess this is being used for creating the latest artifacts in case a newer version of BRMS policy is been distributed to Policy.
Note: Currently, i'm looking at the Amsterdam code base of policy.