Github user takezoe commented on the issue:
https://github.com/apache/incubator-predictionio/pull/425
@mars Some of them I suggested are applied by this pull request. But as a
result of checking the whole codebase, I thought that I shouldn't apply some of
them to the whole.
For now, all of my refactoring is this pull request, but I may create an
another pull request in the future.
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