public void handleMessage(Message message) {
        Reply reply = ((DocumentMessage)message).createReply();
        message.swapState(reply);

        params.getDataHandler().onMessage(message, new AckToken(reply));
    }
Creates a message bus visitor destination session.

@param params the parameters for the visitor destination session
@param bus the message bus to use
documentapi/src/main/java/com/yahoo/documentapi/messagebus/MessageBusVisitorDestinationSession.java