def recv_method(self, method, params, id_, randomSeed=None):
        """DDP method handler."""
        if randomSeed is not None:
            this.random_streams.random_seed = randomSeed
            this.alea_random = alea.Alea(randomSeed)
        self.api.method(method, params, id_)
        self.reply('updated', methods=[id_])