# Copyright (c) 2017-2019 Uber Technologies, Inc.
# SPDX-License-Identifier: Apache-2.0
import functools
from .messenger import Messenger
[docs]class ReentrantMessenger(Messenger):
def __init__(self):
self._ref_count = 0
super().__init__()
def __call__(self, fn):
return functools.wraps(fn)(super().__call__(fn))
def __enter__(self):
self._ref_count += 1
if self._ref_count == 1:
super().__enter__()
return self
def __exit__(self, exc_type, exc_value, traceback):
self._ref_count -= 1
if self._ref_count == 0:
super().__exit__(exc_type, exc_value, traceback)