Enable incremental cache cleanup Instead of computing the complete list of eligible files at once, SingleDepthFileFinder now returns an Iterable that creates an Iterator that will incrementally walk the file tree.
In addition, the CleanupAction.clean() operation now takes a CountdownTimer and implementations periodically check whether the timer has expired. If so, the current cleanup will be aborted. DefaultPersistentDirectoryCache now uses a timeout of 20 seconds which is well below the file locking timeout of 60 seconds.
The marker file (gc.properties) will only be updated if the complete cleanup was able to finish without expiring the timeout.
Clean up least recently used entries in external resources file store The files in the external resources file store cache are now automatically cleaned up based on a least recently used strategy. The structure in the cache is as follows: