兰州城市学院本科生素质拓展学分制 ...ppt

计算机软件的发展与新技术   北京东方瑞威科技发展有限公司 2007.03.17 软件技术发展趋势 新的软件体系架构——Web Service与SOA 应用需求，网络服务，面向服务架构（SOA，Service-oriented architecture） 新的软件编程模型——构件技术与软件工厂 网络构件：流动的是构件，应用和实现分离，提供标准接口和框架，构件组合； 软件工厂： 一是批量自动生产，二是生产、下载、组装、使用、销毁等重要环节。 新的软件运行方式——点击运行与按需下载 点击运行：先启动应用，再启动服务的软件模型，用户不需维护； 按需下载：关卡收费，等待时间最少；滚动下载(运行时不断下载/加载必要的构件) 异构环境下的网络构件互操作性 一般应用程序的二进制互操作；构件互操作(JAVA、.Net、C/C++、CAR、COM) Wine、Cgywin、JAVA、VS.Net、Windows / Linux / Elastos。 安全性与版本管理越来越重要 网络安全，系统安全，构件安全，应用安全、版本管理、Win Vista Bata1安全 互联网促成了一个全球化的市场，信息技术是全球化进程中的主要推动力。 网络促进软件技术的发展 Ten Problems in Web Seamless computing problem: c:\windows\system32\drivers\tcpip.sys solution:///car/elastos/drivers/tcpip.dll No software installation problem: registry solution: manifest Binary code versioning problem: allocating memory on stack solution: allocate memory on heap Binary module interoperability problem: naked binary or incompatible symbols solution: contract/interface based programming and meta-class TCP/IP is irrelevant to programming paradigm problem: X-Window died solution: WEB Services and dynamic proxy Ten Problems in Web Windows as a wrong programming paradigm problem: WinProc() assumes source code availability solution: function callback table Message passing is out of question problem: polling cant extend to distributed computing solution: asynchronous pushing events Scripting GUI vs. codec engines problem: scripts are flexible but slow solution: directly scripting codec engines with reflection Unified storage model problem: application data files are isolated solution: XML and database Software manufacturing at runtime problem: C/C++ objects based on source code solution: component aggregates aspects to form assembly in context The Progress of 3G 3rd generation Internet (1st - Email, 2nd - Browser, 3rd - WEB Services) 3rd generation programming paradigm (1st - structure oriented, 2nd – object oriented, 3rd – WEB Services) 3rd generation operating s