UserManagement: Add Membership Cache
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Key: JCR-2703
URL: https://issues.apache.org/jira/browse/JCR-2703
Project: Jackrabbit Content Repository
Issue Type: Improvement
Components: jackrabbit-core, security
Affects Versions: 2.1.0, 2.0.0
Reporter: angela
Assignee: angela
Fix For: 2.2.0
due to weakreference nature of the group members, retrieving the groups a given
authorizable is member is expensive as the corresponding
API call (Node#getWeakReferences) executes a query [fallback if search is
disabled: traversing the complete group tree, which isn't for free either].
i would therefore suggest to add a cache (authorizable nodeId -> group nodeids)
that is gets cleared upon any modification to group membership or
group removal and doesn't need any extra observation. this cache may
potentially obsolete the principal-based cache in DefaultPrincipalProvider...
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