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- """
- IO/concurrency helpers for `tqdm.contrib`.
- """
- from collections import deque
- from concurrent.futures import ThreadPoolExecutor
- from ..auto import tqdm as tqdm_auto
- __author__ = {"github.com/": ["casperdcl"]}
- __all__ = ['MonoWorker']
- class MonoWorker(object):
- """
- Supports one running task and one waiting task.
- The waiting task is the most recent submitted (others are discarded).
- """
- def __init__(self):
- self.pool = ThreadPoolExecutor(max_workers=1)
- self.futures = deque([], 2)
- def submit(self, func, *args, **kwargs):
- """`func(*args, **kwargs)` may replace currently waiting task."""
- futures = self.futures
- if len(futures) == futures.maxlen:
- running = futures.popleft()
- if not running.done():
- if len(futures): # clear waiting
- waiting = futures.pop()
- waiting.cancel()
- futures.appendleft(running) # re-insert running
- try:
- waiting = self.pool.submit(func, *args, **kwargs)
- except Exception as e:
- tqdm_auto.write(str(e))
- else:
- futures.append(waiting)
- return waiting
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