Snippets

Jason Kenny base example for thread pool with async in python

Created by Jason Kenny
snippet.py
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import asyncio
from concurrent.futures import ProcessPoolExecutor
import time
import os
import functools
import types


def f(x):
    return x * x


async def factorial(name, number):
    f = 1
    for i in range(2, number + 1):
        #print("Task %s: Compute factorial(%s)..." % (name, i))
        # await asyncio.sleep(.01)
        f *= i
    print("DONE FUNC")
    return name


# def main()

def thread_main(func):
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    x = loop.run_until_complete(func())
    return x


def _done(self, func):
    self.add_done_callback(func)
    return self


def Task(func):
    pump = asyncio.get_event_loop()
    ret = pump.run_in_executor(None, thread_main, func)
    setattr(ret, "Done", types.MethodType(_done, ret))
    return ret


x = 1000


async def main():

    print("Start MAIN")

    ret = await asyncio.gather(
        Task(functools.partial(factorial, "a", x)).Done(
            lambda x: print("DONE", x.result())),
        Task(functools.partial(factorial, "b", x)),
        Task(functools.partial(factorial, "c", x)),
        Task(functools.partial(factorial, "a", x)),
        Task(functools.partial(factorial, "b", x)),
        Task(functools.partial(factorial, "c", x)),
        Task(functools.partial(factorial, "a", x)),
        Task(functools.partial(factorial, "b", x)),
        Task(functools.partial(factorial, "c", x)),
        Task(functools.partial(factorial, "a", x)),
        Task(functools.partial(factorial, "b", x)),
        Task(functools.partial(factorial, "c", x)),
        Task(functools.partial(factorial, "a", x)),
        Task(functools.partial(factorial, "b", x)),
        Task(functools.partial(factorial, "c", x)),
        Task(functools.partial(factorial, "a", x)),
        Task(functools.partial(factorial, "b", x)),
        Task(functools.partial(factorial, "c", x)),
        Task(functools.partial(factorial, "a", x)),
        Task(functools.partial(factorial, "b", x)),
        Task(functools.partial(factorial, "c", x)),
        Task(functools.partial(factorial, "a", x)),
        Task(functools.partial(factorial, "b", x)),
        Task(functools.partial(factorial, "c", x)),
        Task(functools.partial(factorial, "a", x)),
        Task(functools.partial(factorial, "b", x)),
        Task(functools.partial(factorial, "c", x)),
        Task(functools.partial(factorial, "a", x)),
        Task(functools.partial(factorial, "b", x)),
        Task(functools.partial(factorial, "c", x)),
    )

    print("Finished MAIN")
    print(ret)

if __name__ == '__main__':
    # create process/thread pool
    executor = ProcessPoolExecutor()
    # get event loop
    loop = asyncio.get_event_loop()
    # set default executor
    loop.set_default_executor(executor)
    # call func
    loop.run_until_complete(main())

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