parameters: (self)
docstring: Overridden by HistoryManager to dump the cache before certain
          database lookups.
docstring_summary: Overridden by HistoryManager to dump the cache before certain
          database lookups.
docstring_tokens: Overridden by HistoryManager to dump the cache before certain database lookups .
function: def writeout_cache(self):
          """Overridden by HistoryManager to dump the cache before certain
          database lookups."""
          pass
function_tokens: def writeout_cache ( self ) : pass