def lock(self):
if self.locked == True:
return
import datetime as dt
mc = mcClient()
mc.add(key=self.key + "@lockedAt", value=dt.datetime.now(), namespace="Mutex")
v = mc.incr(self.key, namespace="Mutex", initial_value=1)
while v != 1:
mc.decr(self.key, namespace="Mutex")
lastLockedAt = mc.get(self.key + "@lockedAt", namespace="Mutex")
if lastLockedAt is None or \
(dt.datetime.now() - lastLockedAt > dt.timedelta(seconds=self.maxTimeOut*4)):
mc.set(key=self.key, value=0, namespace="Mutex")
else:
random.seed(time.time())
time.sleep(random.random() * self.maxTimeOut)
v = mc.incr(self.key, namespace="Mutex", initial_value=1)
mc.set(key=self.key + "@lockedAt", value=dt.datetime.now(), namespace="Mutex")
self.locked = True
import logging
import random
import time
from google.appengine.api.memcache import Client as mcClient
mc = mcClient()
NS = "mtx"
class Mutex:
"""Simple mutex mechanism.
A fork of:
http://appengine-cookbook.appspot.com/recipe/mutex-using-memcache-api/
Example use:
m = Mutex("Some Key", 2)
try:
m.lock()
# Do stuff here....
except:
# Handle errors here....
pass
finally:
m.unlock()
"""
def __init__(self, key, mem_timeout=30):
self.key = key
self.mem_timeout = mem_timeout
self.locked = False
random.seed()
import logging
import random
import time
from google.appengine.api.memcache import Client as mcClient
mc = mcClient()
NS = "mtx"
class Mutex:
"""Simple mutex mechanism.
A fork of:
http://appengine-cookbook.appspot.com/recipe/mutex-using-memcache-api/
Example use:
m = Mutex("Some Key", 2)
try:
m.lock()
# Do stuff here....
except:
# Handle errors here....
pass
finally:
m.unlock()
"""
def __init__(self, key, mem_timeout=30):
self.key = key
self.mem_timeout = mem_timeout
def unlock(self):
if self.locked == True:
mc = mcClient()
mc.decr(self.key, namespace="Mutex")
self.locked = False