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