Research on Distributed Network Operating System based on Object Oriented Approach.

该项目的目标是开发一个分布式网络操作系统，该操作系统提供分布在网络上的基本设施，以便在不知道它们在哪里以及如何处理的情况下使用计算机、打印机、文件服务器等。为此，我们正在开发O^2NE(面向对象的网络环境)。O^2NE为网络上的所有资源提供统一的面向对象的接口，如文件、打印机、程序和工作站。也就是说，所有资源的行为都像一个对象，可以由消息激活和控制。O^2NE为网络应用的用户和开发者提供了两种透明性1)网络位置的透明性：每个对象的位置由服务器管理。用户只需通过用户提供的名称即可使用每个对象。2)并行性透明性：用户无需任何特殊处理即可同时订购和运行多个作业，由Unix操作系统下的元类服务器(MCS)和对象外壳(Objsh)两个服务器进程提供网络环境。Objsh提供了用户界面，用户可以在其中通过MCS向网络中的所有对象发送消息。对象类的描述以分层方式存储在类词典中。MCS存在于连接到网络的每台机器上，管理其机器中的所有对象，并生成或终止它们。MCS还将消息从他的计算机上的对象发送到驻留在另一台计算机上的对象。

The goal of this project is to develop an distributed network operating system which provide the basic facility spread out on network to use computers,printers file servers,etc without knowing where they are and how they are dealt with. Toward this goal,we are developing O^2NE(Object Oriented Network Environment).O^2NE provide the unified object oriented interface to all resources on network such as files,printers,programs and workstations. That is,all resources behave like an object which can be activated and controlled by messages. O^2NE provide two kinds of transparency to users and developers of network wide application.1) transparency of network location:The location of each object is managed by a server. The user can make use of each object only by its name provided by the user.2)transparency of parallelism: The user can order and run many jobs simultaneously without any special treatment.Two server processes under UNIX operating system,metaclass server (MCS) and object shell (objsh), provide the network environment. Objsh provides the user interfaces where a user can send messages to all the objects in the network through MCS. The descriptions of an object,class,are stored in the class dictionary by a hierarchical manner. MCS exists on each machine connected to the network and manage all object in his machine and generates or terminate them. MCS also sends messages from the objects on his machine to the one residing on the other machine.