[jira] [Created] (MESOS-1162) Add a 'Percentage' abstraction.

["Benjamin Mahler (JIRA)" <ji...@apache.org>]

Benjamin Mahler created MESOS-1162:
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             Summary: Add a 'Percentage' abstraction.
                 Key: MESOS-1162
                 URL: https://issues.apache.org/jira/browse/MESOS-1162
             Project: Mesos
          Issue Type: Improvement
          Components: stout
            Reporter: Benjamin Mahler


It is currently difficult to add a percentage-based flag, if one desires it to be specified in the "0%"-"100%" form. This requires creating a {{string}} flag and doing all the parsing  / validation manually.

An alternative is to use a {{double}} flag with 0.0-1.0 being the valid range, however, this may not read as intuitively to operators.

Another alternative is to use a {{double}} flag with 0.0-100.0 as the valid range, with the '%' being implicit.

However, these two alternative techniques can lead to confusion since it's not clear how we're interpreting the value. Requiring the '%' symbol is nice because it leaves no room for ambiguity.

I would propose adding a 'Percentage' abstraction in stout that provides the parsing logic for use in flags. Percentages can basically be a wrapper around the underlying {{double}}.



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