https://github.com/kaste/ndb-x

Synchronization primitives for ndb tasklets on Google AppEngine (GAE)
https://github.com/kaste/ndb-x

app-engine google-appengine

Last synced: about 1 year ago
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Synchronization primitives for ndb tasklets on Google AppEngine (GAE)

• Host: GitHub
• URL: https://github.com/kaste/ndb-x
• Owner: kaste
• License: mit
• Created: 2014-04-28T14:36:55.000Z (almost 12 years ago)
• Default Branch: master
• Last Pushed: 2014-04-28T15:10:02.000Z (almost 12 years ago)
• Last Synced: 2025-02-21T16:48:27.567Z (about 1 year ago)
• Topics: app-engine, google-appengine
• Language: Python
• Homepage:
• Size: 125 KB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.rst
  • License: LICENSE

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README

          
Inspired by pythons new *asyncio*, this package implements the most basic synchronization primitives to work with ndb's tasklets for the Google AppEngine (GAE)

Install

=======

``pip install ndb-x``

Usage

=====

We have the three primitives ``Lock``, ``Semaphore`` and ``BoundedSemaphore``. Usage is, what you expect, straightforward::

    from google.appengine.ext import ndb

    from ndbx.locks import Lock

    lock = Lock()

    @ndb.tasklet

    def work_async():

        # using a context-manager will release the lock automatically

        with (yield lock.acquire()):

            rv = yield do_something_async()

    @ndb.tasklet

    def traditional_flow():

        yield lock.acquire()

        try:

            # do something

        finally:

            lock.release()