A convenient wrapper for caching the results returned by the underlying VarSource.
A VarSource for ClassLoader resources.
A VarSource which queries a primary underlying source, and queries a failover source only when the primary result is VarSource.Failed.
A VarSource for observing the contents of a file with periodic polling.
A VarSource provides access to observerable named variables.
A VarSource for observing the contents of a file with periodic polling.
Note: java.nio.file provides WatchService, but Unfortunately we still need to be java 6 compatible.