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https://issues.apache.org/jira/browse/VELTOOLS-157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Osipov closed VELTOOLS-157.
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> Race condition when instantiating tools
> ---------------------------------------
>
> Key: VELTOOLS-157
> URL: https://issues.apache.org/jira/browse/VELTOOLS-157
> Project: Velocity Tools
> Issue Type: Bug
> Components: GenericTools, Misc
> Affects Versions: 2.0
> Environment: Linux/Tomcat
> Reporter: Colin Leroy
> Assignee: Claude Brisson
> Priority: Minor
> Fix For: 3.0
>
> Attachments: fix_tool_instantiation_race.patch
>
>
> Hello,
> Since Velocity tools are lazy-loaded when necessary only, there's a (wide)
> race condition problem during tools instantiation.
> Until the tool has been constructed, configure()'d and init()'d, it is not
> accessible in the toolbox cache and every invocation of the tool triggers a
> new Construct(), configure() and init().
> The problem is unavoidable with any tool for which initialization takes a few
> seconds on a heavy enough traffic - for example my Lucene-based search tool
> gets typically instantiated two or three times on my production servers, and
> can get instantiated dozens of time on an artificially generated load (siege
> for example).
> The following patch fixes that.
> I hope it's good enough to get incorporated, if not, I'm willing to put more
> work in it.
> Thanks for your help !
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