Fetching with datastore & memcached

main.py

#!/usr/bin/env python
#
# Copyright 2007 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
from google.appengine.ext import webapp
from google.appengine.ext.webapp import util
from google.appengine.ext import db
from google.appengine.api import memcache

import time 

class User(db.Model):
  """Models """ 
  name = db.StringProperty(required=True)


class MainHandler(webapp.RequestHandler):
    def get(self):
        init_time = time.time()
        users = memcache.get('user_list') 
        if users is None:
            users = User.all()
            memcache.add('user_list', users, 8)
            self.response.out.write('users fetched from datastore in :') 
        else:
          self.response.out.write('users fetched from memcached in :') 
        end_time = time.time()
        self.response.out.write('%f milliseconds ' % 
                                (end_time - init_time) )
  
class PopulateHandler(webapp.RequestHandler):
    def get(self):
        for user in range(1000):
            User(name=str(time.time())).put()


def main():
    application = webapp.WSGIApplication([
              ('/', MainHandler),
              ('/populate/', PopulateHandler),
          ],  
                                         debug=True)
    util.run_wsgi_app(application)


if __name__ == '__main__':
    main()