[jira] [Created] (KAFKA-3571) Traits for utilities like ConsumerGroupCommand

["Greg Zoller (JIRA)" <ji...@apache.org>]

Greg Zoller created KAFKA-3571:
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             Summary: Traits for utilities like ConsumerGroupCommand
                 Key: KAFKA-3571
                 URL: https://issues.apache.org/jira/browse/KAFKA-3571
             Project: Kafka
          Issue Type: New Feature
          Components: clients
    Affects Versions: 0.9.0.1
            Reporter: Greg Zoller
            Priority: Minor


I notice that several utilities like ConsumerGroupCommand are implemented (hard-wired really) to be command-line utilities.  It'd be really handy for testing if these were broken out as Scala traits (that don't call println) with the concrete classes or objects being the command-line utility.

As a trait I could create a thin wrapper class passing the same array of arguments, and instead of producing screen output the trait could produce result classes.  

The command-line utilities (your concrete classes implementing the traits) could format screen output from the result classes.

Why do this?  It'd be a really nice way for test code to query things like offsets and such after a test run.



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