1# Copyright 2016 gRPC authors.
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
15import threading
16from concurrent import futures
17
18
19class RecordingThreadPool(futures.Executor):
20    """A thread pool that records if used."""
21
22    def __init__(self, max_workers):
23        self._tp_executor = futures.ThreadPoolExecutor(max_workers=max_workers)
24        self._lock = threading.Lock()
25        self._was_used = False
26
27    def submit(self, fn, *args, **kwargs):
28        with self._lock:
29            self._was_used = True
30        self._tp_executor.submit(fn, *args, **kwargs)
31
32    def was_used(self):
33        with self._lock:
34            return self._was_used
35