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()
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