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https://issues.apache.org/jira/browse/SHIRO-566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15306846#comment-15306846
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ASF GitHub Bot commented on SHIRO-566:
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GitHub user mattbishop opened a pull request:
https://github.com/apache/shiro/pull/19
SHIRO-566 Use Collections wrappers to save memory and cpu.
See https://issues.apache.org/jira/browse/SHIRO-566 for details
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mattbishop/shiro SHIRO-566
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/shiro/pull/19.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #19
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commit ed3a61538ebd776023168405befada19fe6e35ac
Author: Matt Bishop <[email protected]>
Date: 2016-05-30T17:47:28Z
SHIRO-566 Use Collections wrappers to save memory and cpu.
----
> CollectionUtils should use Collections wrappers of arrays if possible
> ---------------------------------------------------------------------
>
> Key: SHIRO-566
> URL: https://issues.apache.org/jira/browse/SHIRO-566
> Project: Shiro
> Issue Type: Improvement
> Components: Authorization (access control)
> Affects Versions: 1.2.4
> Environment: Any
> Reporter: Matt Bishop
> Priority: Trivial
>
> org.apache.shiro.util.CollectionUtils.asSet() and .asList() could use
> Collections wrappers for the passed-in elements. These are smaller and faster
> than copying the contents into other collections.
> The editability of the returned Collections is not required as currently it
> will return either an unmodifiable emptyList() / emptySet() or a modifiable
> ArrayList / LinkedHashSet. Ideally it would wrap the LinkedHashSet in
> unmodifiableSet and declare the immutability of the returned collections in
> the docs.
> In my use case for Shiro we create about 6000 - 7000 WildcardPermission
> objects per second. The great majority of them have a single subpart and
> don't need a proper LinkedHashSet created. This change improve the
> performance of our system by 10% under heavy load, mostly due to the reduced
> GC of temporary LinkedHashSet objects.
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