Tamas Palfy created NIFI-6729:
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             Summary: Create abstract generic ControllerServiceLookup class
                 Key: NIFI-6729
                 URL: https://issues.apache.org/jira/browse/NIFI-6729
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Extensions
            Reporter: Tamas Palfy
            Assignee: Tamas Palfy


The new  fairly new {{AzureStorageCredentialsControllerServiceLookup}} and the 
{{DBCPConnectionPoolLookup}} has a lot of common logic and points to a general 
concept that could be captured with an abstract implementation: 

A utility service that looks up a certain type of service from a predefined 
list.
These services are mapped to predefined string keys.
Which service is to be used is determined based on a flowfile attribute that 
holds the corresponding predefined key.



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