[jira] [Commented] (FELIX-4819) Use Set instead of List for cycle detection

["Guillaume Nodet (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FELIX-4819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14357126#comment-14357126 ] 

Guillaume Nodet commented on FELIX-4819:
----------------------------------------

The latest code for FELIX-4656 actually includes this one.

> Use Set instead of List for cycle detection
> -------------------------------------------
>
>                 Key: FELIX-4819
>                 URL: https://issues.apache.org/jira/browse/FELIX-4819
>             Project: Felix
>          Issue Type: Improvement
>          Components: Resolver
>            Reporter: Philippe Marschall
>              Labels: patch
>         Attachments: ResolverImpl.java.patch
>
>
> We did some profiling of the Felix resolver in our application and 16% were spent in {{ArrayList#indexOf}} called by {{{{ArrayList#contains}}. It seems that {{ResolverImpl}} uses {{java.util.ArrayList}} for data structures on which it only calls {{#add}} and {{#contains}} with the latter being O(n). A {{java.util.HashSet}} is the appropriate data structure for such this use case.



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