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The consumers of a Manager's service interface may receive information both synchronously by querying the service, and asynchronously as an event listener (e.g. by using an EventListener a ListenerService interface that is part of each Service interface to register for events and implementing an EventListener interface for receiving the events).
Store
Also within the core and associated closely with the Manager, Stores have the task of indexing, persisting, and synchronizing the information received by the Manager. This includes ensuring consistency and robustness of information across multiple ONOS instances by directly communicating with stores on other ONOS instances. Further discussion of Stores in distributed settings is found in Cluster Coordination.
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