[GitHub] incubator-brooklyn pull request: Adds boolean ConfigKey.isNonNull(...

[ahgittin <gi...@git.apache.org>]

Github user ahgittin commented on the pull request:

    https://github.com/apache/incubator-brooklyn/pull/356#issuecomment-72013306
  
    @sjcorbett i still think it is too confusing having `nonNull()` verified at deployment time for entities.  people routinely set config early in the start sequence but after deployment. if the `EntityFactory` check were remove i think we'd be fine, and we are clear that the meaning of `nonNull` is that a `get(key)` call never returns null.
    
    i'm okay with merging it once the deploy-time check is removed.  (that could be refactored to a utility method available on demand.)
    
    however if you have bandwidth or there is not a pressing need for this now my preference would still be to apply a `ConfigValidation` scheme instead of this impl, and to do this now rather than introduce the api proposed here which i think we'll deprecate.  a `ConfigValidation` scheme could have a `NON_NULL_ON_DEPLOY` or `NON_NULL_ON_USE` and we can cleanly do deploy-time checks.  it could then be expanded with things like `MATCHES_REGEX` and `IN_RANGE` etc.
    
    this could follow the `ConfigInheritance` pattern in https://github.com/apache/incubator-brooklyn/pull/483 .
    
    (with apologies for the delay in replying, and for the merge conflicts that are now present)



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