第 30 卷 第 2 期 电 子 科 技 大 学 学 报 Vol.30 No.2
2001 年 4 月 Journal of UEST of China Apr. 2001
Received on July 28, 2000
* The project supported by the Academic Foundation of Nuclear Physics of China
UML Modeling Mechanism Based on Layered
Structure of Abstraction
∗
Wu Yue Luo Wuman
(College of Computer Science and Engineering, UEST of China Chengdu 610054)
Abstract This paper introduces UML(Unified Modeling Language) modeling method. Based on the
experience of traditional software development method and the analysis of traditional three layered structure of
abstraction in UML, two ideas of abstraction and decomposition are brought forward as the kernel modeling ideas of
UML to construct the abstraction modeling mechanism of UML that generalizes the process of computer system into
the process of picking up five cells: the function cell. the structure cell, the service cell, the implementation cell and
the integration cell. The purpose is to make use of the whole semantics of UML effectively and to get over the
limitation of traditional OO method and eventually to achieve the perfectly transition from requirement to analysis
and virtual separation of function and implementation.
Key words unified modeling language; abstraction; decomposition; layered modeling; cell
1 Some Concepts of UML
1.1 Use case
An use case is a coherent unit of functionality provided by a system or class as manifested by
sequences of messages exchanged among the system and one or more outside interactors (called actors)
together with actions performed by the system.
1.2 Class
A class is the descriptor for a set of objects with similar structure, behavior, and relationships. A class
may use a set of interfaces to specify collections of operations it provides to its environment. Class may be
abstract and executable.
1.3 Interface
An interface is a declaration of a collection of operations that may be used for defining a service
offered by an instance of class (object). An interface serves to name a collection of operations and specify
their signatures and protocols. An interface offers no implementation (method) for any of its operations.
1.4 Package
A package is a group of model elements such as classes. A package may contain both subordinate
packages and ordinary model elements. Some packages may be subsystems or models. The entire system
description can be thought of as a single high-level subsystem package with anything else in it.
1.5 Component
component is a non-trivial, nearly independent and replaceable part of a system that fulfills a
clear function in the context of a well-defined architecture. A component conforms to and provides the
physical realization of a set of interfaces. A component may be one or more class.
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