Notification listeners

2 min

give you flexibility in implementing custom integrations with analytics providers.

let you configure integrations by passing data to external services.

work by triggering a callback function that you define.

Use cases

The following are a few example use cases for notification listeners:

Send data to an analytics service and report feature flag decision data. For example, report that user_123 was assigned to variation A.

Use SDK events to send alerts to data monitoring tools like New Relic and Datadog to visualize how A/B tests affect service-level metrics.

Pass all events to an external data tier, like a data warehouse, for additional processing and to use business intelligence tools.

Re-initialize your SDK to retrieve updated feature flag configuration data for your business-critical features.

Notification listeners

Notification listeners in Feature Experimentation work by triggering a callback function that you define and provide at runtime. The following methods or lifecycle events trigger notification listeners if you have implemented the listener:

Decide methods – Invoke the Decision notification listener if the listener is enabled.

Track event method – Invokes the Track notification listener if the listener is enabled.

Important This method does not call the track notification listener when the specified event key is invalid

Event batch flushed – Invokes the Log event notification listener if the listener is enabled.

New datafile retrieved – Invokes the OptimizelyConfigUpdate notification listener if this listener is enabled.