This is a pre-production deployment of Warehouse. Changes made here affect the production instance of PyPI (pypi.python.org).
Help us improve Python packaging - Donate today!
Project Description

A “dogpile” lock, one which allows a single thread to generate an expensive resource while other threads use the “old” value, until the “new” value is ready.

Dogpile is basically the locking code extracted from the Beaker package, for simple and generic usage.

Usage

A simple example:

from dogpile.core import Dogpile

# store a reference to a "resource", some
# object that is expensive to create.
the_resource = [None]

def some_creation_function():
    # create the resource here
    the_resource[0] = create_some_resource()

def use_the_resource():
    # some function that uses
    # the resource.  Won't reach
    # here until some_creation_function()
    # has completed at least once.
    the_resource[0].do_something()

# create Dogpile with 3600 second
# expiry time
dogpile = Dogpile(3600)

with dogpile.acquire(some_creation_function):
    use_the_resource()

Above, some_creation_function() will be called when Dogpile.acquire() is first called. The remainder of the with block then proceeds. Concurrent threads which call Dogpile.acquire() during this initial period will be blocked until some_creation_function() completes.

Once the creation function has completed successfully the first time, new calls to Dogpile.acquire() will call some_creation_function() each time the “expiretime” has been reached, allowing only a single thread to call the function. Concurrent threads which call Dogpile.acquire() during this period will fall through, and not be blocked. It is expected that the “stale” version of the resource remain available at this time while the new one is generated.

dogpile.core is at the core of the dogpile.cache package which provides for a basic cache API and sample backends based on the dogpile concept.

Development Status

dogpile.core has been in use in a small number of production environments for a period of months, and as of 0.3.2 has entered beta status. No issues have been reported yet with its core synchronization model, and overall the project hasn’t seen many changes. Most development continues within dogpile.cache.

Release History

Release History

0.4.1

This version

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Show More

0.4.0

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Show More

0.3.3

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Show More

0.3.2

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Show More

0.3.1

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Show More

0.3.0

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Show More

0.3.0dev

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Show More

Download Files

Download Files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
dogpile.core-0.4.1.tar.gz (99.6 kB) Copy SHA256 Checksum SHA256 Source Nov 15, 2013

Supported By

WebFaction WebFaction Technical Writing Elastic Elastic Search Pingdom Pingdom Monitoring Dyn Dyn DNS Sentry Sentry Error Logging CloudAMQP CloudAMQP RabbitMQ Heroku Heroku PaaS Kabu Creative Kabu Creative UX & Design Fastly Fastly CDN DigiCert DigiCert EV Certificate Rackspace Rackspace Cloud Servers DreamHost DreamHost Log Hosting