A library of composable Python executors and futures
This library is intended for use with the
module. It includes a collection of
Executor implementations in order to
extend the behavior of
- Futures with implicit retry
- Futures with implicit cancel on executor shutdown
- Futures with implicit cancel after timeout
- Futures with transformed output values (sync & async)
- Futures resolved by a caller-provided polling function
- Throttle the number of futures running at once
- Synchronous executor
- Convenience API for creating executors
See the API documentation for detailed information on usage.
This example combines the map and retry executors to create futures for HTTP requests running concurrently, decoding JSON responses within the future and retrying on error.
import requests from concurrent.futures import as_completed from more_executors import Executors def get_json(response): response.raise_for_status() return (response.url, response.json()) def fetch_urls(urls): # Configure an executor: # - run up to 4 requests concurrently, in separate threads # - run get_json on each response # - retry up to several minutes on any errors executor = Executors.\ thread_pool(max_workers=4).\ with_map(get_json).\ with_retry() # Submit requests for each given URL futures = [executor.submit(requests.get, url) for url in urls] # Futures API works as normal; we can block on the completed # futures and map/retry happens implicitly for future in as_completed(futures): (url, data) = future.result() do_something(url, data)
pip may be used to locally install this project from
virtualenv ~/dev/python . ~/dev/python/bin/activate git clone https://github.com/rohanpm/more-executors cd more-executors pip install --editable .
Autotests may be run with pytest:
pip install -r test-requirements.txt py.test
Submit pull requests against https://github.com/rohanpm/more-executors.
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
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