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# Copyright 2015 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Sample App Engine application demonstrating how to use the Namespace Manager
API with Memcache.
For more information, see README.md.
"""
# [START all]
from google.appengine.api import namespace_manager
from google.appengine.api import taskqueue
from google.appengine.ext import ndb
import webapp2
class Counter(ndb.Model):
count = ndb.IntegerProperty()
@ndb.transactional
def update_counter(name):
"""Increment the named counter by 1."""
counter = Counter.get_by_id(name)
if counter is None:
counter = Counter(id=name, count=0)
counter.count += 1
counter.put()
return counter.count
def get_count(name):
counter = Counter.get_by_id(name)
if not counter:
return 0
return counter.count
class DeferredCounterHandler(webapp2.RequestHandler):
def post(self):
name = self.request.get('counter_name')
update_counter(name)
class TaskQueueCounterHandler(webapp2.RequestHandler):
"""Queues two tasks to increment a counter in global namespace as well as
the namespace is specified by the request, which is arbitrarily named
'default' if not specified."""
def get(self, namespace='default'):
# Queue task to update global counter.
current_global_count = get_count('counter')
taskqueue.add(
url='/tasks/counter',
params={'counter_name': 'counter'})
# Queue task to update counter in specified namespace.
previous_namespace = namespace_manager.get_namespace()
try:
namespace_manager.set_namespace(namespace)
current_namespace_count = get_count('counter')
taskqueue.add(
url='/tasks/counter',
params={'counter_name': 'counter'})
finally:
namespace_manager.set_namespace(previous_namespace)
self.response.write(
'Counters will be updated asyncronously.'
'Current values: Global: {}, Namespace {}: {}'.format(
current_global_count, namespace, current_namespace_count))
app = webapp2.WSGIApplication([
(r'/tasks/counter', DeferredCounterHandler),
(r'/taskqueue', TaskQueueCounterHandler),
(r'/taskqueue/(.*)', TaskQueueCounterHandler)
], debug=True)