Exemple #1
0
def increase_shards(name, num):
    """
    Increase the number of shards for a given sharded counter.
    Will never decrease the number of shards.
    """
    config = Config.get_or_insert(name, name=name)

    def txn():
        if config.num_shards < num:
            config.num_shards = num
            config.put()

    db.run_in_transaction(txn)
Exemple #2
0
def increment(name, delta=1):
    """
    Increment the value for a given sharded counter.
    """
    config = Config.get_or_insert(name, name=name)

    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()

    db.run_in_transaction(txn)
    memcache.incr(name, delta=delta)