1# Copyright 2020 The TensorFlow Authors. All Rights Reserved. 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14# ============================================================================== 15"""Context for building SavedModel.""" 16 17from __future__ import absolute_import 18from __future__ import division 19from __future__ import print_function 20 21import contextlib 22import threading 23 24 25class SaveContext(threading.local): 26 """A context for building a graph of SavedModel.""" 27 28 def __init__(self): 29 super(SaveContext, self).__init__() 30 self._in_save_context = False 31 self._options = None 32 33 def options(self): 34 if not self.in_save_context(): 35 raise ValueError("not in a SaveContext") 36 return self._options 37 38 def enter_save_context(self, options): 39 self._in_save_context = True 40 self._options = options 41 42 def exit_save_context(self): 43 self._in_save_context = False 44 self._options = None 45 46 def in_save_context(self): 47 return self._in_save_context 48 49_save_context = SaveContext() 50 51 52@contextlib.contextmanager 53def save_context(options): 54 if in_save_context(): 55 raise ValueError("already in a SaveContext") 56 _save_context.enter_save_context(options) 57 try: 58 yield 59 finally: 60 _save_context.exit_save_context() 61 62 63def in_save_context(): 64 """Returns whether under a save context.""" 65 return _save_context.in_save_context() 66 67 68def get_save_options(): 69 """Returns the save options if under a save context.""" 70 return _save_context.options() 71