1 #!/usr/bin/python2.5

     2 #

     3 # Copyright 2008 the Melange authors.

     4 #

     5 # Licensed under the Apache License, Version 2.0 (the "License");

     6 # you may not use this file except in compliance with the License.

     7 # You may obtain a copy of the License at

     8 #

     9 #   http://www.apache.org/licenses/LICENSE-2.0

    10 #

    11 # Unless required by applicable law or agreed to in writing, software

    12 # distributed under the License is distributed on an "AS IS" BASIS,

    13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    14 # See the License for the specific language governing permissions and

    15 # limitations under the License.

    16 

    17 """Module containing some basic caching functions.

    18 """

    19 

    20 __authors__ = [

    21     '"Sverre Rabbelier" <sverre@rabbelier.nl>',

    22   ]

    23 

    24 

    25 from functools import wraps

    26 

    27 

    28 def getCacher(get, put):

    29   """Returns a caching decorator that uses get and put

    30   """

    31 

    32   # TODO(SRabbelier) possibly accept 'key' instead, and define

    33   # get and put in terms of key, depends on further usage

    34 

    35   def cache(func):

    36     """Decorator that caches the result from func

    37     """

    38   

    39     @wraps(func)

    40     def wrapper(*args, **kwargs):

    41       result = get(*args, **kwargs)

    42       if result:

    43         return result

    44 

    45       result = func(*args, **kwargs)

    46       put(result)

    47       return result

    48 

    49     return wrapper

    50 

    51   return cache