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# Copyright 2013 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.
from appengine_wrappers import db, IsDevServer
from datastore_models import PersistentObjectStoreItem
from future import Future
import logging
from object_store import ObjectStore
class _AsyncGetFuture(object):
def __init__(self, object_store, keys):
self._futures = dict(
(k, db.get_async(
PersistentObjectStoreItem.CreateKey(object_store._namespace, k)))
for k in keys)
def Get(self):
return dict((key, future.get_result().GetValue())
for key, future in self._futures.iteritems()
if future.get_result() is not None)
class PersistentObjectStore(ObjectStore):
'''Stores data persistently using the AppEngine Datastore API.
'''
def __init__(self, namespace):
self._namespace = namespace
def SetMulti(self, mapping):
futures = []
for key, value in mapping.items():
futures.append(db.put_async(
PersistentObjectStoreItem.CreateItem(self._namespace, key, value)))
# If running the dev server, the futures don't complete until the server is
# *quitting*. This is annoying. Flush now.
if IsDevServer():
[future.wait() for future in futures]
def GetMulti(self, keys):
return Future(delegate=_AsyncGetFuture(self, keys))
def DelMulti(self, keys):
futures = []
for key in keys:
futures.append(db.delete_async(
PersistentObjectStoreItem.CreateKey(self._namespace, key)))
# If running the dev server, the futures don't complete until the server is
# *quitting*. This is annoying. Flush now.
if IsDevServer():
[future.wait() for future in futures]
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