ranger/ext/cached_function.py

   1 # Copyright (C) 2012  Roman Zimbelmann <romanz@lavabit.com>
   2 #
   3 # This program is free software: you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation, either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 def cached_function(fnc):
  17   cache = {}
  18   def inner_cached_function(self, *args):
  19     try:
  20       return cache[args]
  21     except:
  22       value = fnc(self, *args)
  23       cache[args] = value
  24       return value
  25   inner_cached_function._cache = cache
  26   return inner_cached_function
  27