factory_test_tools: merge latest improvements from ToT to R12 factory branch

gft_common.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Google Factory Tools Common Library
 
 This module includes several common utilities for Google Factory Tools
 A detailed description of gft_common.
 """
 
 import os
 import subprocess
 import sys
 import tempfile
+import threading
 import time
 
 
 ########################################################################
 # Global Variables
 
 
 _debug = False
 _verbose = False
 _log_path = None
@@ skipping 180 matching lines @@
   with open(filename, "rb") as opened_file:
     return opened_file.read()
 
 
 def WriteFile(filename, data):
   """ Writes one file and exit. """
   with open(filename, "w") as opened_file:
     opened_file.write(data)
 
 
+def ThreadSafe(f):
+  """ Decorator for functions that need synchronoization. """
+  lock = threading.Lock()
+  def threadsafe_call(*args):
+    try:
+      lock.acquire()
+      return f(*args)
+    finally:
+      lock.release()
+  return threadsafe_call
+
+
+def Memorize(f):
+  """ Decorator for functions that need memorization. """
+  memorize_data = {}
+  def memorize_call(*args):
+    index = repr(args)
+    if index in memorize_data:
+      value = memorize_data[index]
+      # DebugMsg('Memorize: using cached value for: %s %s' % (repr(f), index))
+      return value
+    value = f(*args)
+    memorize_data[index] = value
+    return value
+  return memorize_call
+
 ########################################################################
 # Components Databases
 
 
 def ExpandComponentsDatabaseMacro(data, database_file):
   """ Processes and expands macros in a component database. """
   allow_macro_fields = (
       'data_bitmap_fv'
   )
   macros = {
@@ skipping 56 matching lines @@
 
 def GetComponentsDatabaseBase(database_file):
   """ Gets the base folder of a components database file.  """
   # Currently the database file is assuming properties sit in its parent folder.
   base = os.path.join(os.path.split(os.path.abspath(database_file))[0], '..')
   return os.path.abspath(base)
 
 
 if __name__ == '__main__':
   print "Google Factory Tool Common Library."