[jira] [Closed] (OAK-5589) GlobbingPathFilter constructor is expensive

["Davide Giannella (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-5589?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davide Giannella closed OAK-5589.
---------------------------------

Bulk close for 1.6.1

> GlobbingPathFilter constructor is expensive
> -------------------------------------------
>
>                 Key: OAK-5589
>                 URL: https://issues.apache.org/jira/browse/OAK-5589
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.6.0
>            Reporter: Stefan Egli
>            Assignee: Stefan Egli
>             Fix For: 1.7.0, 1.8, 1.6.1
>
>         Attachments: OAK-5589.patch
>
>
> The [GlobbingPathFilter constructor|https://github.com/apache/jackrabbit-oak/blob/jackrabbit-oak-1.6.0/oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/observation/filter/GlobbingPathFilter.java#L75] is doing an expensive {{ImmutableList.copyOf}} while traversing down a path as part of filtering. ImmutableList internally first creates a Builder with capacity 4 - thus frequently has to do an {{ObjectArrays.arraysCopyOf}}.
> Two things that can be improved here:
> * as suggested by [~mduerig] that [private constructor|https://github.com/apache/jackrabbit-oak/blob/jackrabbit-oak-1.6.0/oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/observation/filter/GlobbingPathFilter.java#L74] - should not copy at all. Only the public constructors should. So the public constructors should be rewritten to reflect this.
> * {{ImmutableList.copyOf}} cannot be passed an initial capacity unfortunately. Perhaps there's an alternative for this though.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)