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Posted to dev@felix.apache.org by "Philippe Marschall (JIRA)" <ji...@apache.org> on 2015/04/05 14:37:33 UTC
[jira] [Commented] (FELIX-4819) Use Set instead of List for cycle
detection
[ https://issues.apache.org/jira/browse/FELIX-4819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14396206#comment-14396206 ]
Philippe Marschall commented on FELIX-4819:
-------------------------------------------
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.
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