1#!/usr/bin/env python3 2# 3# Copyright 2019 - The Android Open Source Project 4# 5# Licensed under the Apache License, Version 2.0 (the "License"); 6# you may not use this file except in compliance with the License. 7# You may obtain a copy of the License at 8# 9# http://www.apache.org/licenses/LICENSE-2.0 10# 11# Unless required by applicable law or agreed to in writing, software 12# distributed under the License is distributed on an "AS IS" BASIS, 13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14# See the License for the specific language governing permissions and 15# limitations under the License. 16import time 17from abc import ABC, abstractmethod 18import logging 19 20 21class Closable(ABC): 22 23 def __enter__(self): 24 return self 25 26 def __exit__(self, type, value, traceback): 27 try: 28 self.close() 29 except Exception: 30 logging.warning("Failed to close or already closed") 31 return traceback is None 32 33 def __del__(self): 34 try: 35 self.close() 36 except Exception: 37 logging.warning("Failed to close or already closed") 38 39 @abstractmethod 40 def close(self): 41 pass 42 43 44def safeClose(closable): 45 if closable is not None: 46 closable.close() 47 # sleep for 100ms because GrpcEventQueue takes at most 100 ms to close 48 time.sleep(0.1) 49