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

   1 # Copyright 2013 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 appengine_wrappers import db
   6 from datastore_models import PersistentObjectStoreItem
   7 from environment import IsDevServer
   8 from future import Future
   9 from object_store import ObjectStore
  10
  11 class _AsyncGetFuture(object):
  12   def __init__(self, object_store, keys):
  13     self._futures = dict(
  14         (k, db.get_async(
  15             PersistentObjectStoreItem.CreateKey(object_store._namespace, k)))
  16          for k in keys)
  17
  18   def Get(self):
  19     return dict((key, future.get_result().GetValue())
  20                 for key, future in self._futures.iteritems()
  21                 if future.get_result() is not None)
  22
  23 class PersistentObjectStore(ObjectStore):
  24   '''Stores data persistently using the AppEngine Datastore API.
  25   '''
  26   def __init__(self, namespace):
  27     self._namespace = namespace
  28
  29   def SetMulti(self, mapping):
  30     futures = []
  31     for key, value in mapping.items():
  32       futures.append(db.put_async(
  33           PersistentObjectStoreItem.CreateItem(self._namespace, key, value)))
  34     # If running the dev server, the futures don't complete until the server is
  35     # *quitting*. This is annoying. Flush now.
  36     if IsDevServer():
  37       [future.wait() for future in futures]
  38
  39   def GetMulti(self, keys):
  40     return Future(delegate=_AsyncGetFuture(self, keys))
  41
  42   def DelMulti(self, keys):
  43     futures = []
  44     for key in keys:
  45       futures.append(db.delete_async(
  46         PersistentObjectStoreItem.CreateKey(self._namespace, key)))
  47     # If running the dev server, the futures don't complete until the server is
  48     # *quitting*. This is annoying. Flush now.
  49     if IsDevServer():
  50       [future.wait() for future in futures]