Page History
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- No notification mechanism to get the virtual or physical resource state changes.
- CloudStack generates a action event and persists in the DB. By polling through listEvents API one can get to know the events that occur but there is no mechanism to enable push notifications.
- usage server which generated usage events tight coupled into orchestration
Proposal
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- introduce a state machine for all the virtual and physical resources which CloudStack manages and generate an event on state transition
- Introduce a light weight event bus
- wildcard subscription
Use cases
- Usage/billing engines
- AMQP
- CMDB
- pub/sub notification service
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Overview
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