promise-keeper 0.3

A simple async processing helper

This module creates a multi-threaded system that you can submit work to, to be executed asynchronously. It will return immediately with a Promise that you can periodically check to see if the work is done.

The main idea is to instantiate an instance of the PromiseKeeper and then submit requests for it to do work on your behalf. It will schedule your request to be executed on a thread and return a Promise instance to you. You can look at the Promise to determine the status of the execution.

The PromiseKeeper will track the results (return value) of your requested work and include it in the Promise that it returned to you. If your work request raises an exception, the PromiseKeeper will capture the exception and include that in the Promise as well.

Here’s a quick example:

#!/usr/bin/env python

from promise_keeper import PromiseKeeper
from random import random
from time import sleep

def slow_square(x):
    sleep(random() * 3)
    return x*x

pk = PromiseKeeper()

# doesn't block
promise = pk.submit(slow_square, (10,))

# while the promise is being processed
# you can go on and do other work.

while not promise.is_ready():
    # do other work here.
    print '.',

# Check the result of your work
print promise.get_result()

More documentation and examples can be found here.

Copyright (c) 2017, Steve Brettschneider. License: MIT (see LICENSE for details)