Devserver: have a separate ObjectStore namespace (both memcache and datastore)

chrome/common/extensions/docs/server2/github_file_system.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import json
 import logging
 import os
 
 import appengine_blobstore as blobstore
-from appengine_wrappers import urlfetch
+from appengine_wrappers import GetAppVersion, urlfetch
 from file_system import FileSystem, StatInfo
 from future import Future
 from object_store_creator import ObjectStoreCreator
 from StringIO import StringIO
 from zipfile import ZipFile, BadZipfile
 
 ZIP_KEY = 'zipball'
 USERNAME = None
 PASSWORD = None
 
@@ skipping 35 matching lines @@
     self._blobstore.Set(_MakeBlobstoreKey(self._key_to_set),
                         blob,
                         blobstore.BLOBSTORE_GITHUB)
     return return_zip
 
 class GithubFileSystem(FileSystem):
   """FileSystem implementation which fetches resources from github.
   """
   def __init__(self, fetcher, blobstore):
     self._fetcher = fetcher
-    self._stat_object_store = ObjectStoreCreator(GithubFileSystem).Create()
+    self._stat_object_store = (ObjectStoreCreator.SharedFactory(GetAppVersion())
+        .Create(GithubFileSystem).Create())
     self._blobstore = blobstore
     self._version = None
     self._GetZip(self.Stat(ZIP_KEY).version)
 
   def _GetZip(self, version):
     blob = self._blobstore.Get(_MakeBlobstoreKey(version),
                                blobstore.BLOBSTORE_GITHUB)
     if blob is not None:
       try:
         self._zip_file = Future(value=ZipFile(StringIO(blob)))
@@ skipping 84 matching lines @@
     version = (json.loads(result.content).get('commit', {})
                                          .get('tree', {})
                                          .get('sha', None))
     # Check if the JSON was valid, and set to 0 if not.
     if version is not None:
       self._stat_object_store.Set(path, version)
     else:
       logging.warning('Problem fetching commit hash from github.')
       return self._DefaultStat(path)
     return StatInfo(version)