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

["Philippe Marschall (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FELIX-4819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Philippe Marschall updated FELIX-4819:
--------------------------------------
    Comment: was deleted

(was: Indeed it does. I'll close as a duplicate.)

> 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)