[jira] Updated: (MNG-2717) Cache the repo dependencies

["Brian Fox (JIRA)" <ji...@codehaus.org>]

     [ http://jira.codehaus.org/browse/MNG-2717?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brian Fox updated MNG-2717:
---------------------------

    Fix Version/s:     (was: Reviewed Pending Version Assignment)
                   2.1

> Cache the repo dependencies
> ---------------------------
>
>                 Key: MNG-2717
>                 URL: http://jira.codehaus.org/browse/MNG-2717
>             Project: Maven 2
>          Issue Type: Improvement
>          Components: Artifacts and Repositories
>    Affects Versions: 2.0.4
>            Reporter: Nigel Magnay
>            Priority: Minor
>             Fix For: 2.1
>
>
> Once projects get of a significant size, there can be a large number of dependencies, and transitive dependencies thereof. 
> In our WAR projects (for example), this can approach a few hundred dependencies (though there are a fair number of duplicates).
> Looking at JProfiler (after examinining one of my own non-maven tools that also parses POM files), the parsing cycle of reading all these POM files from the local repo, and pull-parsing them for dependencies takes a significant proportion of the execute time (4 of the top 10 hotspots are in MXParser.
> Since non-snapshot dependencies ought never to change their dependencies [1], and dependency download could trigger the fact that the dependencies might have changed anyway, some kind of caching mechanism could be used to speed this up (something like {artifact, scope} -> List{artifact}).
> [1] I have reserved a particular space in hell for those people who *do* change the deps on released POMs... ;-S

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