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#!/usr/bin/env python3
from __future__ import annotations
from collections.abc import Mapping
import concurrent.futures as fut
import time
from typing import Callable, List, TypeVar
from deferred_operand import DeferredOperand
import id_generator
T = TypeVar('T')
def wait_any(futures: List[SmartFuture], *, callback: Callable = None):
finished: Mapping[int, bool] = {}
x = 0
while True:
future = futures[x]
if not finished.get(future.get_id(), False):
if future.is_ready():
finished[future.get_id()] = True
yield future
else:
if callback is not None:
callback()
time.sleep(0.1)
x += 1
if x >= len(futures):
x = 0
if len(finished) == len(futures):
if callback is not None:
callback()
return
class SmartFuture(DeferredOperand):
"""This is a SmartFuture, a class that wraps a normal Future and can
then be used, mostly, like a normal (non-Future) identifier.
Using a FutureWrapper in expressions will block and wait until
the result of the deferred operation is known.
"""
def __init__(self, wrapped_future: fut.Future) -> None:
self.wrapped_future = wrapped_future
self.id = id_generator.get("smart_future_id")
def get_id(self) -> int:
return self.id
def is_ready(self) -> bool:
return self.wrapped_future.done()
# You shouldn't have to call this; instead, have a look at defining a
# method on DeferredOperand base class.
def _resolve(self, *, timeout=None) -> T:
return self.wrapped_future.result(timeout)
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