def add_async_receiver(
            self, consumer_group, partition, offset=None, prefetch=300,
            operation=None, keep_alive=30, auto_reconnect=True, loop=None):
        """
        Add an async receiver to the client for a particular consumer group and partition.

        :param consumer_group: The name of the consumer group.
        :type consumer_group: str
        :param partition: The ID of the partition.
        :type partition: str
        :param offset: The offset from which to start receiving.
        :type offset: ~azure.eventhub.common.Offset
        :param prefetch: The message prefetch count of the receiver. Default is 300.
        :type prefetch: int
        :operation: An optional operation to be appended to the hostname in the source URL.
         The value must start with `/` character.
        :type operation: str
        :rtype: ~azure.eventhub.async_ops.receiver_async.ReceiverAsync
        """
        path = self.address.path + operation if operation else self.address.path
        source_url = "amqps://{}{}/ConsumerGroups/{}/Partitions/{}".format(
            self.address.hostname, path, consumer_group, partition)
        handler = AsyncReceiver(
            self, source_url, offset=offset, prefetch=prefetch,
            keep_alive=keep_alive, auto_reconnect=auto_reconnect, loop=loop)
        self.clients.append(handler)
        return handler
Add an async receiver to the client for a particular consumer group and partition.

        :param consumer_group: The name of the consumer group.
        :type consumer_group: str
        :param partition: The ID of the partition.
        :type partition: str
        :param offset: The offset from which to start receiving.
        :type offset: ~azure.eventhub.common.Offset
        :param prefetch: The message prefetch count of the receiver. Default is 300.
        :type prefetch: int
        :operation: An optional operation to be appended to the hostname in the source URL.
         The value must start with `/` character.
        :type operation: str
        :rtype: ~azure.eventhub.async_ops.receiver_async.ReceiverAsync