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From "Peter Firmstone (JIRA)" <j...@apache.org>
Subject [jira] Updated: (RIVER-323) DynamicPolicyProvider - Concurrency
Date Mon, 09 Nov 2009 22:23:32 GMT

     [ https://issues.apache.org/jira/browse/RIVER-323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Peter Firmstone updated RIVER-323:

    Attachment: ConcurrentPermissions_DynamicPolicyProviderVersion3.patch

Various changes, reducing unnecessary object creation, structure changes, concurrency bug

> DynamicPolicyProvider - Concurrency
> -----------------------------------
>                 Key: RIVER-323
>                 URL: https://issues.apache.org/jira/browse/RIVER-323
>             Project: River
>          Issue Type: Improvement
>          Components: net_jini_security
>         Environment: All
>            Reporter: Peter Firmstone
>            Priority: Minor
>         Attachments: ConcurrentPermissions_DynamicPolicyProvider.patch, ConcurrentPermissions_DynamicPolicyProviderVersion2.patch,
>   Original Estimate: 40h
>  Remaining Estimate: 40h
> From the river-dev mail list:
> I have been looking into some seemingly slow responses in several clients running simultaneously,
and I see in some stack traces that there are synchronization points in DynamicPolicyProvider.implies()
that seem to be heavily contended.  We probably need to revisit this class and rewrite it
to use copy on write mutation so that reads (the majority of activity) are completely uncontended.
> Any thoughts or experience with this issue?
> Gregg Wonderly

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