Docserver: Persist stat cache for versioned file systems

chrome/common/extensions/docs/server2/samples_data_source.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 logging
 import traceback
 
 from data_source import DataSource
 from extensions_paths import EXAMPLES
-from future import All, Future
 from jsc_view import CreateSamplesView
 from platform_util import GetPlatforms
 
 
 class SamplesDataSource(DataSource):
   '''Constructs a list of samples and their respective files and api calls.
   '''
   def __init__(self, server_instance, request):
     self._platform_bundle = server_instance.platform_bundle
     self._request = request
 
   def _GetImpl(self, platform):
     cache = self._platform_bundle.GetSamplesModel(platform).GetCache()
     create_view = lambda samp_list: CreateSamplesView(samp_list, self._request)
     return cache.GetFromFileListing('' if platform == 'apps'
                                        else EXAMPLES).Then(create_view)
 
   def get(self, platform):
     return self._GetImpl(platform).Get()
 
   def GetRefreshPaths(self):
     return [platform for platform in GetPlatforms()]
 
   def Refresh(self, path):
     return self._GetImpl(path)