Extensions Docs Server: Internal file system

chrome/common/extensions/docs/server2/appengine_memcache.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.
+
+MEMCACHE_FILE_SYSTEM_READ = 'MemcacheFileSystem.Get'
+MEMCACHE_FILE_SYSTEM_STAT = 'MemcacheFileSystem.Stat'
+MEMCACHE_BRANCH_UTILITY = 'BranchUtility'
+
+class AppEngineMemcache(object):
+  """A wrapper around the standard App Engine memcache that enforces namespace
+  use. Uses a branch to make sure there are no key collisions if separate
+  branches cache the same file.
+  """
+  def __init__(self, branch, memcache):
+    self._branch = branch
+    self._memcache = memcache
+
+  def Set(self, key, value, namespace, time=60):
+    return self._memcache.set(key,
+                              value,
+                              namespace=self._branch + '.' + namespace,
+                              time=time)
+
+  def Get(self, key, namespace):
+    return self._memcache.get(key, namespace=self._branch + '.' + namespace)
+
+  def Delete(self, key, namespace):
+    return self._memcache.delete(key, namespace=self._branch + '.' + namespace)