Question

我需要创建一个Runner类，该类可以异步运行多个作业，并在所有作业完成后返回结果。这是我已经拥有的虚拟代码段

import asyncio

class Runner:
  def __init__(self):
    self.jobs_loop = asyncio.new_event_loop()

  async def slow_process(self, *args):
    ...  # run slow proces with args
    await asyncio.sleep(5)
    return "result"

  def batch_run(self, count, *args):
    results = self.jobs_loop.run_until_complete(asyncio.gather(
      *[self.slow_process(*args) for _ in range(count)],
      loop=self.jobs_loop,
      return_exceptions=True
    ))
    return results

runner = Runner()
print(runner.batch_run(10))

调用batch_run时，它将调度count作业并阻塞直到完成。但是，这在运行中的事件循环引发中不起作用 RuntimeError: Cannot run the event loop while another loop is running

从现有事件循环（例如Jupyter Console）调用batch_run以及从事件循环外部调用时，如何使def batch_run(self, count, *args): loop = asyncio.get_event_loop() jobs = asyncio.gather(...) if not loop.is_running(): return loop.run_until_complete(jobs) else: future = asyncio.ensure_future(jobs, loop=loop) # loop.wait_until_completed(future) return future.result()工作。

编辑

理想情况下，该功能看起来像这样

loop.wait_until_completed

如果只有long time1 = System.currentTimeMillis(); usingStringConcatenation(100000); System.out.println("usingStringConcatenation " + (System.currentTimeMillis() - time1) + " ms"); time1 = System.currentTimeMillis(); usingStringBuilder(100000); System.out.println("usingStringBuilder " + (System.currentTimeMillis() - time1) + " ms"); private static void usingStringBuilder(int n) { StringBuilder str = new StringBuilder(); for(int i=0;i<n;i++) str.append("myBigString"); } private static void usingStringConcatenation(int n) { String str = ""; for(int i=0;i<n;i++) str+="myBigString"; }存在。

从运行循环开始异步循环

0 个答案: