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https://issues.apache.org/jira/browse/NIFI-3004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15803173#comment-15803173
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Andy LoPresto commented on NIFI-3004:
-------------------------------------

After discussing with Pierre I also added an expiration (currently 5 
invocations) of {{customValidate}} where even if a property has not been 
changed, the validation results cache will expire and the whole validation will 
occur when called. 

> Improve StandardSSLContextService customValidate
> ------------------------------------------------
>
>                 Key: NIFI-3004
>                 URL: https://issues.apache.org/jira/browse/NIFI-3004
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Extensions
>    Affects Versions: 1.0.0
>            Reporter: Michael Moser
>            Assignee: Pierre Villard
>            Priority: Minor
>              Labels: newbie
>
> The StandardSSLContextService customValidate() method can be called many 
> times in one validation cycle, so it must be efficient.  Currently, it calls 
> validateStore() on keystore and truststore, which opens each file and 
> verifies it can be read and the password is correct.  If that works then it 
> calls verifySslConfig() which creates 3 sample SSLContext objects.
> Improve this by remembering when customValidate() has been successful and 
> avoiding doing another full validation either for a very small amount of time 
> or until one of the Property values changes.



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