Docserver: there is only one.

chrome/common/extensions/docs/server2/compiled_file_system.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.
 
 class _CacheEntry(object):
   def __init__(self, cache_data, version):
     self._cache_data = cache_data
     self.version = version
 
 class CompiledFileSystem(object):
   """This class caches FileSystem data that has been processed.
   """
   class Factory(object):
     """A class to build a CompiledFileSystem backed by |file_system|.
     """
     def __init__(self, file_system, object_store_creator):
       self._file_system = file_system
       self._object_store_creator = object_store_creator
 
     def Create(self, populate_function, cls, category=None):
       """Create a CompiledFileSystem that populates the cache by calling
       |populate_function| with (path, data), where |data| is the data that was
       fetched from |path|.
       The namespace for the file system is derived like ObjectStoreCreator: from
       |cls| along with an optional |category|.
       """
       assert isinstance(cls, type)
       assert not cls.__name__[0].islower()  # guard against non-class types
-      full_name = cls.__name__
+      full_name = [cls.__name__, self._file_system.GetIdentity()]
       if category is not None:
-        full_name = '%s/%s' % (full_name, category)
-      def create_object_store(category):
+        full_name.append(category)
+      def create_object_store(my_category):
         return self._object_store_creator.Create(
-            CompiledFileSystem, category='%s/%s' % (full_name, category))
+            CompiledFileSystem, category='/'.join(full_name + [my_category]))
       return CompiledFileSystem(self._file_system,
                                 populate_function,
                                 create_object_store('file'),
                                 create_object_store('list'))
 
     def CreateIdentity(self, cls):
       '''Handy helper to get or create the identity compiled file system.
       GetFromFile will return the file's contents.
       GetFromFileListing will return the directory list.
       '''
@@ skipping 55 matching lines @@
       return cache_entry.version
     return self._file_system.Stat(path).version
 
   def StatFileListing(self, path):
     if not path.endswith('/'):
       path += '/'
     cache_entry = self._list_object_store.Get(path).Get()
     if cache_entry is not None:
       return cache_entry.version
     return self._file_system.Stat(path).version