I'm currently using the FileSystemPersister setup like this:

FileSystemPersisterFactory.create( cache, pathResolver, 1, TimeUnit.HOURS )

I'd like to use getRefreshing() and clear(). However, FileSystemPersister doesn't implement Clearable. How can I bust the cache of the FileSystemPersister while still utilizing a timed cache and networkBeforeStale()?

The readme section about SourcePerster and FileSystem make it seem like this is supposed to be working. Am I missing something?