def txn():
index = random.randint(1, config.num_shards)
shard_name = name + str(index)
counter = Shard.get_by_key_name(shard_name)
if counter is None:
counter = Shard(key_name=shard_name, name=name)
counter.count += delta
counter.put()
def get_count(name):
"""
Retrieve the value for a given sharded counter.
"""
total = memcache.get(name)
if total is None:
total = 0
for counter in Shard.all().filter('name = ', name):
total += counter.count
memcache.add(name, str(total), 60)
return total
