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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)