[jira] [Created] (SLING-7175) Improve concurrency in FSDynamicClassLoader

["Karl Pauls (JIRA)" <ji...@apache.org>]

Karl Pauls created SLING-7175:
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             Summary: Improve concurrency in FSDynamicClassLoader
                 Key: SLING-7175
                 URL: https://issues.apache.org/jira/browse/SLING-7175
             Project: Sling
          Issue Type: Improvement
          Components: Commons
    Affects Versions: File System ClassLoader 1.0.6
            Reporter: Karl Pauls
            Assignee: Karl Pauls
             Fix For: File System ClassLoader 1.0.8


FSDynamicClassLoader currently maintains two synchronized sets of class names that have been loaded ( a "hit" and a "miss" set). That can be a source of contention when a lot of classes are loaded concurrently. 

I think we can optimize this somewhat by a) merging the two sets into one (as they are never used independently from what I can tell) and b) using a Collections.newSetFromMap(new ConcurrentHashMap) instead of a Collections.synchronizedSet(new HashSet()). 

Furthermore, the isDirty boolean flag should be volatile as it might be accessed concurrently. 



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