#!/usr/bin/env python3
-from __future__ import annotations
+# © Copyright 2021-2022, Scott Gasch
+
+"""A future that can be treated like the result that it contains and
+will not block until it is used. At that point, if the underlying
+value is not yet available, it will block until it becomes
+available.
+"""
+
+from __future__ import annotations
import concurrent
import concurrent.futures as fut
import logging
-import traceback
from typing import Callable, List, Set, TypeVar
from overrides import overrides
smart_future_by_real_future = {}
completed_futures: Set[fut.Future] = set()
for x in futures:
- assert type(x) == SmartFuture
+ assert isinstance(x, SmartFuture)
real_futures.append(x.wrapped_future)
smart_future_by_real_future[x.wrapped_future] = x
if log_exceptions and not f.cancelled():
exception = f.exception()
if exception is not None:
- logger.warning(
- f'Future {id(f)} raised an unhandled exception and exited.'
- )
+ logger.warning('Future 0x%x raised an unhandled exception and exited.', id(f))
logger.exception(exception)
raise exception
yield smart_future_by_real_future[f]
if callback is not None:
callback()
- return
def wait_all(
) -> None:
real_futures = []
for x in futures:
- assert type(x) == SmartFuture
+ assert isinstance(x, SmartFuture)
real_futures.append(x.wrapped_future)
(done, not_done) = concurrent.futures.wait(
if not f.cancelled():
exception = f.exception()
if exception is not None:
- logger.warning(
- f'Future {id(f)} raised an unhandled exception and exited.'
- )
+ logger.warning('Future 0x%x raised an unhandled exception and exited.', id(f))
logger.exception(exception)
raise exception
assert len(done) == len(real_futures)
"""
def __init__(self, wrapped_future: fut.Future) -> None:
- assert type(wrapped_future) == fut.Future
+ assert isinstance(wrapped_future, fut.Future)
self.wrapped_future = wrapped_future
self.id = id_generator.get("smart_future_id")
# You shouldn't have to call this; instead, have a look at defining a
# method on DeferredOperand base class.
@overrides
- def _resolve(self, *, timeout=None) -> T:
+ def _resolve(self, timeout=None) -> T:
return self.wrapped_future.result(timeout)