[jira] [Created] (NIFI-7130) Change FlowController and StandardFlowService to use interfaces and allow injection

["Andy LoPresto (Jira)" <ji...@apache.org>]

Andy LoPresto created NIFI-7130:
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             Summary: Change FlowController and StandardFlowService to use interfaces and allow injection
                 Key: NIFI-7130
                 URL: https://issues.apache.org/jira/browse/NIFI-7130
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Core Framework
    Affects Versions: 1.11.1
            Reporter: Andy LoPresto


The {{FlowController}} and {{StandardFlowService}} classes are critical components in the NiFi controller which require a number of collaborator services but create these classes internally and do not allow for dependency injection or inversion of control. This makes them nearly impossible to coherently unit test, and they are very brittle and tightly coupled to specific implementations. 

Introducing interfaces and allowing for dependency injection would greatly improve the testability and composition of these classes. 



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