[jira] [Commented] (MATH-1341) "RandomDataGenerator" is brittle

["Luc Maisonobe (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MATH-1341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15282935#comment-15282935 ] 

Luc Maisonobe commented on MATH-1341:
-------------------------------------

Seems good to me.

> "RandomDataGenerator" is brittle
> --------------------------------
>
>                 Key: MATH-1341
>                 URL: https://issues.apache.org/jira/browse/MATH-1341
>             Project: Commons Math
>          Issue Type: Bug
>            Reporter: Gilles
>            Priority: Minor
>              Labels: API, cleanup, deprecation, thread-safety
>             Fix For: 4.0
>
>         Attachments: RandomUtils.java
>
>
> Class {{RandomDataGenerator}} can easily be misused as it advertizes a method to access its internal RNG (which is _not_ thread-safe).
> The class is also a mixed bag of "data generators" that are either "secure" or not.
> Moreover it uses the "lazy initialization" pattern (for the RNG instance) solely because of this duality; otherwise users that need one or the other form of data generation will obviously always use the RNG since all data generation methods need it.
> This entails also a performance hit (albeit tiny) as each call checks whether the RNG has been initialized already.
> The clean solution would be to separate the two types of data generation (secure vs not) into different classes.



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