Data store garbage collection: ScanEventListener not working
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Key: JCR-1469
URL: https://issues.apache.org/jira/browse/JCR-1469
Project: Jackrabbit
Issue Type: Bug
Affects Versions: core 1.4.1
Reporter: Thomas Mueller
Assignee: Thomas Mueller
Fix For: core 1.4.2
The ScanEventListener is currently only called when using the 'scan all nodes
recursively' strategy. It is not called when all persistence managers implement
IterablePersistenceManager (GarbageCollector.scanPersistenceManagers). The
ScanEventListener should be called in every case, otherwise it is not possible
to see the progress of the garbage collection.
However there is a problem: IterablePersistenceManager.getAllNodeIds() doesn't
return Node objects, and it would make little sense to create real node objects
(the performance advantage of scanPersistenceManagers would be lost).
Therefore, I propose a workaround: the ScanEventListener is called using a
'PseudoNode'. This is a class that implements Node but only has meaningful
getUUID() and toString() methods. This allows to create a meaningful progress
bar (as the UUIDs are returned in order).
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