Docserver: Override Walk in CachingFileSystem

chrome/common/extensions/docs/server2/api_models.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.
 
 import posixpath
 
-from compiled_file_system import SingleFile, Unicode
+from compiled_file_system import Cache, SingleFile, Unicode
 from extensions_paths import API_PATHS
 from features_bundle import HasParent, GetParentName
 from file_system import FileNotFoundError
 from future import All, Future
 from operator import itemgetter
 from platform_util import PlatformToExtensionType
 from schema_util import ProcessSchema
 from third_party.json_schema_compiler.json_schema import DeleteNodes
 from third_party.json_schema_compiler.model import Namespace, UnixName
 
@@ skipping 38 matching lines @@
                compiled_fs_factory,
                file_system,
                object_store_creator,
                platform):
     self._features_bundle = features_bundle
     self._platform = PlatformToExtensionType(platform)
     self._model_cache = compiled_fs_factory.Create(
         file_system, self._CreateAPIModel, APIModels, category=self._platform)
     self._object_store = object_store_creator.Create(APIModels)
 
+  @Cache
   @SingleFile
   @Unicode
   def _CreateAPIModel(self, path, data):
     def does_not_include_platform(node):
       return ('extension_types' in node and
               node['extension_types'] != 'all' and
               self._platform not in node['extension_types'])
 
     schema = ProcessSchema(path, data)[0]
     if not schema:
@@ skipping 99 matching lines @@
 
   def IterModels(self):
     future_models = [(name, self.GetModel(name)) for name in self.GetNames()]
     for name, future_model in future_models:
       try:
         model = future_model.Get()
       except FileNotFoundError:
         continue
       if model:
         yield name, model