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      1 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 # Use of this source code is governed by a BSD-style license that can be
      3 # found in the LICENSE file.
      4 
      5 from future import Future
      6 
      7 
      8 class ObjectStore(object):
      9   '''A class for caching picklable objects.
     10   '''
     11   def Get(self, key):
     12     '''Gets a |Future| with the value of |key| in the object store, or None
     13     if |key| is not in the object store.
     14     '''
     15     return self.GetMulti((key,)).Then(lambda keys: keys.get(key))
     16 
     17   def GetMulti(self, keys):
     18     '''Gets a |Future| with values mapped to |keys| from the object store, with
     19     any keys not in the object store omitted.
     20     '''
     21     raise NotImplementedError(self.__class__)
     22 
     23   def Set(self, key, value):
     24     '''Sets key -> value in the object store.
     25     '''
     26     self.SetMulti({ key: value })
     27 
     28   def SetMulti(self, items):
     29     '''Atomically sets the mapping of keys to values in the object store.
     30     '''
     31     raise NotImplementedError(self.__class__)
     32 
     33   def Del(self, key):
     34     '''Deletes a key from the object store.
     35     '''
     36     self.DelMulti([key])
     37 
     38   def DelMulti(self, keys):
     39     '''Deletes |keys| from the object store.
     40     '''
     41     raise NotImplementedError(self.__class__)
     42