Devserver: only populate data during cron jobs, meaning all data from instances

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

+# 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]