DEVELOPMENT OF DISTRIBUTED COMPONENT TECHNOLOGIES

摘要

With the constant improvement of the complexity for a software system and under the vehemence of modem market competition among enterprises, it is necessary to improve the quality of the software and to reduce the developing cycle of the software. Distributed component technology is used widely because of its advantages. Three mainstream component technologies are discussed: EJB, CORBA, and COM/DCOM. EJB components can not only run at any platform, but also they can transplant totally between the application program servers. Application software architecture and object technical specification are established in CORBA, and its technical cores are a set of standard language, interface and protocol. COM is a criterion how component is updated alternately, CCM defines the operation mode of components and their customers, and DCOM is a model based on client and server, expanding COM, supporting the communication on the basis of LAN, WAN even Internet. Either EJB or CORBA or COM/DCOM will influence profoundly on our life and work styles.