Docserver: there is only one.

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

 # Copyright (c) 2012 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.
 
 import json
 import logging
 import operator
 
 from appengine_url_fetcher import AppEngineUrlFetcher
 import url_constants
 
 class ChannelInfo(object):
   def __init__(self, channel, branch, version):
     self.channel = channel
     self.branch = branch
     self.version = version
 
 class BranchUtility(object):
   def __init__(self, fetch_url, history_url, fetcher, object_store_creator):
     self._fetcher = fetcher
-    # BranchUtility is obviously cross-channel, so set the channel to None.
-    self._branch_object_store = object_store_creator.Create(BranchUtility,
-                                                            category='branch',
-                                                            channel=None)
-    self._version_object_store = object_store_creator.Create(BranchUtility,
-                                                             category='version',
-                                                             channel=None)
+    def create_object_store(category):
+      return object_store_creator.Create(BranchUtility, category=category)
+    self._branch_object_store = create_object_store('branch')
+    self._version_object_store = create_object_store('version')
     self._fetch_result = self._fetcher.FetchAsync(fetch_url)
     self._history_result = self._fetcher.FetchAsync(history_url)
 
   @staticmethod
   def GetAllChannelNames():
     return ('stable', 'beta', 'dev', 'trunk')
 
   @staticmethod
   def NewestChannel(channels):
     for channel in reversed(BranchUtility.GetAllChannelNames()):
@@ skipping 128 matching lines @@
     version_json = json.loads(self._history_result.Get().content)
     latest_version = 0
     for entry in version_json['events']:
       version_title = entry['title'].split(' - ')[1].split('.')
       version = int(version_title[0])
       if version > latest_version:
         latest_version = version
 
     self._version_object_store.Set('latest', latest_version)
     return latest_version