| Methods to aid classes recover from OutOfMemoryErrors by denying
or reducing service rather than a complete shutdown of the JVM.
It's intended that classes use to functionality to allow then to
deny service when memory is low to allow the JVM to recover,
rather than start new operations that are probably doomed to
failure due to the low memory.
Expected usage is one instance of this class per major logical
operation, e.g. creating a connection, preparing a statement,
adding an entry to a specific cache etc.
The logical operation would call isLowMemory() before starting
the operation, and thrown a static exception if it returns true.
If during the operation an OutOfMemoryException is thrown the
operation would call setLowMemory() and throw its static exception
representing low memory.
Future enhancments could be a callback mechanism for modules
where they register they can reduce memory usage on a low
memory situation. These callbacks would be triggered by
a call to setLowMemory. For example the page cache could
reduce its current size by 10% in a low memory situation.
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