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From "Guillaume Nodet (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SSHD-739) A call to resolvePropertyValue can be very inefficient
Date Tue, 11 Apr 2017 18:52:41 GMT

    [ https://issues.apache.org/jira/browse/SSHD-739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15964806#comment-15964806
] 

Guillaume Nodet commented on SSHD-739:
--------------------------------------

I also wonder if there's a need to make the {{SyspropsMapWrapper}} dynamic at all.  If it
would be initialized at construction time, it would not have to iterate through all the system
properties each time.

> A call to resolvePropertyValue can be very inefficient
> ------------------------------------------------------
>
>                 Key: SSHD-739
>                 URL: https://issues.apache.org/jira/browse/SSHD-739
>             Project: MINA SSHD
>          Issue Type: Bug
>            Reporter: Guillaume Nodet
>
> Each time a property is retrieved, all system properties names are iterated.
> This is because {{PropertyResolverUtil#resolvePropertyValue}} is calling {{GenericUtils.isEmpty(props)}}
on a {{SyspropsMapWrapper}}.
> This can be solved by using {{isNull(props)}} instead of {{isEmpty(props)}} as there's
no need to check if the map is empty.
> In the same call, there's also a call to {{System.getProperty}} which seems to be redundant
with the {{SyspropsMapWrapper}}.  I think it should be removed.



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