1、英文原文The current situation of the system structure of the software and developing direction In the article of concept of system structure of the software , we speak of from the crisis of the software, have explained origin , defines and the function in the project of the software is developed of the system structure of the software. Then, how is the current situation of the system structure of software at present? What is the development trend of the system structure of software? This is the cont
2、ent that this text will introduce. At present, in the system structure of the software is still in developing rapidly, more and more researchers are casting attention on the research of the system structure of the software. It is still very irregular to use for carrying on model , mark law and tool that the specification describes to the system of the software. Though these irregular models are useful, in order to make it more accurate and more stalwart, the research work in many aspects needs c
3、ontinuing going on.Since later stage of 1990s, the research of the system structure of the software has become a focus . The masses of software worker realize software system great meaning and it that structure study design the importance developed to the software system already, have launched a lot of research and practice work.Is it watch to come by system current situation that structure study from software, present research and to software system description of structure, come to say to stil
4、l stay on the basis of the thing that it is not formalized to a great extent. Teacher , framework of software , lack essential tool still, the tool should explicit describe, have formalized tool of independent character.At present among the in common use software development approach, it is it use formalized picture and text non- usually to describe, cant describe the interface between the components of existence that the system expects , cant describe the meaning of different systematic associa
5、tion relation of composition . Difficult to understand developer , let alone use for analysing its characteristics , such as consistency and integrality ,etc.is studied Component of system nearly by one when describing formalized method non- as one software, the systematic putting in an position will be influenced too, the efforts in the course of designing a systematic structure are very difficult to transplant to another system. Connect to system component structurization of relation is it get
6、 a explicit one to suppose , when the formalized description, it will be risky to transplant such a systematic component to another system, even impossible one.Software system structure is it remain in formalized block diagram stage non- only to study, it has been already difficult to meet the needs of further development. For support based on system structure development , need formalized modeling symbol , system analysis and developing instrument that structure prove. Is it watch to come from
7、software system current situation that structure study, in field this there are progress recently, a representative one Mellon of American Carnegie university among them Robert J.A11en on (Carnegie Mellon University) on Wright system that l997 get out of every year. Wright is- a kind of structure describes languages, this language is on the basis of a kind of formalized , abstract systematic model, have offered a kind of practical tool for the thing that describe and analyse the system structure
8、 of the software and structurization method . Wright lays particular emphasis on and describes systematic software component and structure , disposition and method to join mainly. It uses the explicit , independent connection model to come as mutual way, this make system this can spend logic predicate symbol system , rely on specific systematic instance describe the abstract behavior of the system. System this can also judge systematic structure consistency and integrality of specifications thro
9、ugh checking in a group of static behavior. By the look of analysis of these characteristics, Wright system is really suitable for to large-scale and systematic description and analysis.Study primary problem of the system structure of the software is how to express the system structure of the software, namely what system structure modeling to the software. According to the difference of emphasis points of modeling , can divide the model of the system structure of the software into 5 kinds : Structure model, frame model, dynamic model, course model and function model. In these 5 models, the most frequently used one is the structure model and dynamic model.This is a most ocular , most general modeling method . The method portray the structure with system component , attachment and other concepts of structure, and is it is it reflect important semanteme content of system to come through structure to try hard, including systematic disposition , restraint , implicit as
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