NiFi Developer's Guide
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Component Notification

The NiFi API provides notification support through use of Java Annotations. The org.apache.nifi.annotations.notification package contains several annotations for notification management. The following annotations may be applied to Java methods in a NiFi component to indicate to the framework when the methods should be called. For the discussion of Component Notification, we will define a NiFi component as a Processor, Controller Service, or Reporting Task.