/
thread.py
43 lines (37 loc) · 1.62 KB
/
thread.py
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# Copyright 2021, 2022, 2023 SECTRA AB
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from collections.abc import Callable, Iterable, Iterator
from concurrent.futures import ThreadPoolExecutor
from typing import Any, Optional, TypeVar
ReturnType = TypeVar("ReturnType")
class ConditionalThreadPoolExecutor(ThreadPoolExecutor):
"""ThreadPoolExecutor that uses a single thread if max workers is 1."""
def __init__(
self, max_workers: Optional[int] = None, force_iteration: bool = False, **kwargs
) -> None:
self._force_iteration = force_iteration
super().__init__(max_workers, **kwargs)
def map(
self,
fn: Callable[..., ReturnType],
*iterables: Iterable[Any],
timeout: Optional[float] = None,
chunksize: int = 1
) -> Iterator[ReturnType]:
if self._max_workers == 1:
if self._force_iteration:
# Make sure items are iterated through
return iter(list(map(fn, *iterables)))
return map(fn, *iterables)
return super().map(fn, *iterables, timeout=timeout, chunksize=chunksize)