NiFi Developer's Guide
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Processor Initialization

When a Processor is created, before any other methods are invoked, the init method of the AbstractProcessor will be invoked. The method takes a single argument, which is of type ProcessorInitializationContext. The context object supplies the Processor with a ComponentLog, the Processor's unique identifier, and a ControllerServiceLookup that can be used to interact with the configured ControllerServices. Each of these objects is stored by the AbstractProcessor and may be obtained by subclasses via the getLogger, getIdentifier, and getControllerServiceLookup methods, respectively.