Object Oriented Software Engineering: A Use Case Driven Approach
Product Author Bios
Dr. Ivar Jacobson,Vice President of Business Engineering, is the inventor of the OOSE method, and he is also the founder of Objectory AB in Sweden, which recently merged with Rational Software Corporation. Dr. Jacobson is the principal author of two influential and best-selling books Object-Oriented Software Engineering--A Use Case Driven Approach (Computer Language Productivity award winner in 1992) and The Object Advantage--Business Process Reengineering with Object Technology. He has also authored several widely referenced papers on object technology. One of the most famous papers is his first OOPSLA '87 paper entitled "Object-Oriented Development in an Industrial Environment," which presented the first truly object-oriented method ever published. Ivar Jacobson's use-case driven approachhas had a very strong impact on the entireOOAD industry, and he himself has become one of its "icons." Consequently, he isa frequently invited keynote speaker and panelist, debating OOAD topics withcolleagues and methodologists such as Grady Booch, Jim Rumbaugh, StevenMellor, and Rebecca Wirfs-Brock at major OO conferences around the world.
He is well known for his pioneering work and more than 20 years of experience inusing object methods for the design of large real-time systems. His earlyobject-based design technique has evolved into the international standardITU(formerly CCITT)/SDL.
Dr. Jacobson also regularly serves on the OOPSLA, ECOOP, and TOOLSprogram committees, and he is a member of the advisory board of the Journal ofObject-Oriented Programming.
In 1994, Ivar Jacobson received the first Swedish Computer Association (SCA)award (the Kjell Hultman prize) for "extraordinary achievement in promotingefficiency and productivity in the development and use of informationtechnology."
Patrik Jonsson works at Rational Software Corporation in Sweden as a Senior Consultant where he has been developing the architecture and method of the Objectory process with a current focus on reuse and user interface development.
How can software developers, programmers and managers meet the challenges of the 90s and begin to resolve the software crisis? This book is based on Objectory which is the first commercially available comprehensive object-oriented process for developing large-scale industrial systems. Ivar Jacobson developed Objectory as a result of 20 years of experience building real software-based products. The approach takes a global view of system development and focuses on minimizing the system's life cycle cost. Objectory is an extensible industrial process that provides a method for building large industrial systems. This revised printing has been completely updated to make it as accessible and complete as possible. New material includes the revised Testing chapter, in which new product developments are discussed.
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This is a book on industrial system development using object-oriented techniques. It is not a book on object-oriented programming. We are convinced that the big benefits of object orientation can be gained only by the consistent use of object orientation throughout all steps in the development process. Therefore the emphasis is placed on the other parts of development such as analysis, design and testing.
You will benefit from this book if you are a system developer seeking ways to improve in your profession. If you are a student with no pervious experience in development methods, you will learn a robust framework which you can fill with details as you take part in future development projects. Since the focus on the text is on development, the book will be convenient to use in combination with other texts on object-oriented programming. Many examples illustrate the practical application of analysis and design techniques.
From this book you will get a thorough understanding of how to use object orientation as well as the basic technique throughout the development process. You will learn the benefits of seamless integration between the different development steps and how the basic object-oriented characteristics of class, inheritance and encapsulation are used in analysis, construction and testing. With this knowledge you are in a much better position to evaluate and select the way to develop your next data processing system.
Even though object orientation is the main theme of this book, it is not a panacea for successful system development. The change from craftsmanship to individualization does not come with the change to a new technique. The change must come on a more fundamental level which also includes the organization of the complete development process. Objectory is one example of how this can be done.
This book does not present Objectory. What we present is the fundamental ideas of Objectory and a simplified version of it. In this book we call this simplified method OOSE to distinguish it from Objectory. To use the process in production you will need the complete and detailed process description which, excluding large examples, amounts to more than 1200 pages. Introducing the process into an organization needs careful planning and dedication. It also requires that the process be adapted to the unique needs of the organization. Such process adaptations must of course be carefully specified, which can be done in a development case description, as will later be explained.
It is our hope that we have reached our goal with this book, namely to present a coherent picture of how to use object-orientation system development in a way which will make it accessible both to practitioners in the field and to students with no previous knowledge of system development. This has been done within a framework where system development is treated as an industrial activity and consequently must obey the same requirements as industry in general. The intention is to encourage more widespread use of object-oriented techniques and to inspire more work on improving the ideas expounded here. We are convinced that using these techniques will lead to better systems and a more industrial approach to system development.
Part I: Introduction. The book is divided into three parts. The first part covers the background, and contains the following chapters:
- System development as an industrial process
- The system life cycle
- What is object-orientation?
- Object-oriented system development
- Object-oriented programming
This part gives an introduction to system development and summarizes the requirements of an industrial process. It also discusses the system life cycle. The idea of object orientation is introduced, and how it can be used in system development and during programming is surveyed.
Part II: Concepts. The second part is the core of the book. It contains the following chapters:
- Real-time specialization
- Database specialization
The first chapter in this part introduces the fundamental concepts of OOSE and explains the reason why these concepts are chosen. The following chapter discuss the method of analysis and construction. The next two chapters discusses how the method may be adapted to real-time systems and database management systems. The components chapter discusses what components are and how they they can be used in the development process. Testing activities are discussed in a chapter of their own.
Part III: Applications. The third and last part covers applications of OOSE and how the introduction of the new development process may be organized and managed. This part ends with an overview of other object-oriented methods. This part comprises:
- Case study: warehouse management system
- Case study: Telecom
- Managing object-oriented software engineering
- Other object-oriented methods
Appendix. Finally we have an appendix which comments on our development of Objectory.
So, how should you read this book? Of course, to get a complete overview, the whole book should be read, including the appendix. But if you want to read only selected chapters the reading cases below could be used.
If you are an experienced object-oriented software engineer, you should be familiar with the basics. You could read the book as suggested in Figure P.1.
If you are a newcomer to object-orientation and software engineering you could read the book as in Figure P.2
If you are an experienced software engineer you could read the book as in Figure P.3
If you are a manager you could read the book as proposed in Figure P.4. Although the book is not object-oriented, it is written in a modularized way and can be configured in several different ways. Building systems in this way is the theme of the book, and the technique and notation used above is very similar to the technique used in this book.
A short history and acknowledgments
The work presented in this book was initiated in 1967 when I proposed a set of new modeling concepts (notation with associated semantics) for the development of large telecommunication switching systems. The main concepts were signals and blocks. A real-time system is an open system communicating with its environment by signals alone. A signal models the physical stimulus/response communication which a concrete system has when interacting with the outside world. Given a signal as input, a system performs internal actions such as executing algorithms, accessing internal information, storing results and sending output signals to the environment. This view presents the system in a very abstract way - as a black box. A less abstract view on a lower level models the system as a set of interconnected blocks. Blocks are modules which can be implemented in hardware or software or any combination of both. A block communicates with its environment only through signals. Signals between two blocks are internal, whereas signals modeling physical communication, that is, signals between a block and the environment of the system, are external. Internal signals are messengers conveying data from one block to another within the same system. All entries of a block were labelled and constituted the signal interface of that block, to be specified in a separate interface document. Hence the system can now be viewed as a set of interconnected blocks jointly offering the functions of the system. Each block has a program which it obeys on a receipt of an input signal, performing internal actions, that is, executing algorithms, storing and accessing block internal information, and sending internal and external signals to the environment.
The proposal can be summarized as an attempt to unify long experience of systems design with the possibilities offered by dramatically new computer technology. Since the two technologies were so different, this was not a self-evident method, neither within Ericsson nor within computer science. There was a rather strong belief that the two represented unrelated technological universes: the new one was so different that it would be meaningless and only a burden to make any attempt to learn from the old one. However, the two techniques were joined and a set of modeling concepts evolved.
The modeling constructs were soon followed by the skeleton of a new design method, the use of which was first demonstrated in the development of the AKE system put into service in Rotterdam in 1971, and more completely demonstrated in the AKE system put into service in Fredhall, Sweden, in 1974. Naturally this experience has guided subsequent work on the development of the successor to AKE, the AXE system, which is now in use in more than 80 countries worldwide. The modeling constructs were very important and, for the AXE system, a new programming language and a new computer system were developed in accordance to these early ideas.
Although it is a neighbouring country, the early development of object-oriented programming and Simula in the 1960s in Norway was done independently and in parallel with our work. It was not until 1979 that we "discovered" object-oriented programming and then it was in terms of Smalltalk. Although object-oriented ideas have influenced our recent work, basically two separate problems are being solved: "large-scale" and "small-scale".
The modeling constructs introduced during the 1960s were further formalized in research taking place between 1978 and 1985. The research resulted in a formally described language which offered support for object-orientation with two types of object and two types of communication mechanism, send/wait and send/no-wait semantics. The language supported concurrency with atomic transactions and a special semantic construction for the handling of events similar to the use case construct presented later. This work, reported in a PhD thesis in 1985, resulted in a number of new language constructs, initially developed from experience, being refined and formalized. This was a sound basis from which to continue and, taking a new approach, develop the method. The principles of Objectory were developed in 1985-7. I then further refined and simplified the ideas, generalized the technique used in the telecom applications, extended it with the inheritance concept and other important constructs like extensions, and coupled to it an analysis technique and object-oriented programming.
Today these concepts have been further redefined. The Objectory process, of which this book describes some fundamental ideas, is the result of work by many individuals, most of whom today work at Objective Systems SF AB, Sweden. Gunnar Overgaard and Patrik Jonsson did much of the writing of the first process description of Objectory analysis and design, respectively. Magnus Christerson did much to condense and rewrite the material into the form of this book. They have all contributed to Objectory; especially the formalization of the concepts. Magnus has also related the ideas of Objectory to other areas as presented in this book. Fredrik Lindstrom has also been involved in the condensation of the material of this book. Agneta Jacobson, Bud Lawson amd Lars Wiktorin have prepared material for some of the chapters.
Marten Gustafsson has substantially contributed to the analysis part of Objectory. Valuable contributions to Objectory have also been made by the following people: Sten-Erik Bergner, Per Bjork, Ann Carlbrand, Hakan Dyrhage, Christian Ehrenborg, Agneta Jacobson, Sten Jacobson, Mikael Larsson, Fredrik Lindstrom, Lars Lindroos, Benny Odenteg, Karin Palmkvist, Janne Pettersson, Birgitta Spiridon, Per Sundquist, Lars Wetterborg and Lars Wiktorin. The following users of Objectory have also contributed by feeding back experiences and ideas to enable improvements: Staffan Ehnebom, Per Hedfors, Jorgen Hellberg, Per Kilgren, Haken Lidstrom, Christian Meck, Christer Nilsson, Rune Nilsson, Goran Schefte, Fredrik Stromberg, Karin Villers, Stefan Wallin and Charoltte Wranne. The following persons have done a lot to support the tehnology described in this book: Kjell S. Andersson, Hans Brandtberg, Ingemar Carlsson, Hakan Dahl, Gunnar M. Eriksson, Bjorn Gullbrand, Lars Hallmarken, Bo Hedfors, Barbara Hedlund, Hakan Jansson, Christer Johansson, Ingemar Johnsson, Kurt Katzeff, Rolf Leidhammar, Jorma Mobrin, Jan-Erik Nordin, Anders Rockstrom, Kjell Sorme, Goran Sundelof, Per-Olof Thysselius, Ctirad Vrana and Erik Ornulf. The following people have given me strong personal inspiration and support: Dines Bjorner, Tore Bingefors, Dave Bulman, Larry Constantine, Goran Hemdal, Tom Love, Nils Lennmarker, Lars-Olof Noren, Dave Thomas and Lars-Erik Thorelli. In Sweden we do not normally thank family and friends in these circumstances, but no one beleives that results like these can be achieved without exceptional support from them. We are also grateful to the support we have been given from STU (Swedish National Board iof Industrial Development, now recognized to NUTEK) through the IT-4 program which has been part of the financial support and sponsorship for the writing of this book.
Changes to this revised printing, apart from minor general corrections and improvements, are:
- The testing chapter has been restructured and in parts rewritten, also an emphasis on early testing has been added.
- The discussion of robust object structures have been increased and also an example has been added. We hope this will better clarify why such an object structure gives more robust systems.
- The notion of a development case have been introduced as a way to adapt a general process to the specific needs of an organization or a project.
- Some people we would like to thank were unfortunately left out in the first printing and have now been added to the acknowledgment section, particularly Dave Bulman and Nils Lennmarker who have inspired the technology presented in this book.
Table of Contents
Part 1. Introduction
1. System development as an industrial process
A useful analogy
System development characteristics
2. The system life cycle
System development as a process of change
System development and reuse
System development and methodology
3. What is object-orientation? Introduction
4. Object-oriented system development Introduction
5. Object-oriented programming Introduction
Classes and instances
Part II. Concepts
6. Architecture Introduction
System development is model building
The design model
The implementation model
7. Analysis Introduction
The requirements model
The analysis model
8. Construction Introduction
The design model
Working with construction
9. Real-time specialization Introduction
Classification of real-time systems
Testing and verification
10. Database Specialization Introduction
11. Components Introduction
What is a component?
Use of components
12. Testing Introduction
The testing process
Part III. Applications
13. Case study: warehouse management system Introduction to the examples
ACME Warehouse Management Inc.
The requirements model
The analysis model
14. Case study: telecom Introduction
Telecommunication switching systems
The requirements model
The analysis model
The design model
The implementation model
15. Managing object-oriented software engineering Introduction
Project selection and preparation
Project development organization
Project organization and management
Software quality assurance
16. Other object-oriented methods Introduction
A summary of object-oriented methods
Object-Oriented Analysis (OOAD/Coad-Yourdon)
Object-Oriented Design (OOD/Booch)
Hierarchical Object-Oriented Design (HOOD)
Object Modeling Technique (OMT)
Appendix A On the development of Objectory Introduction
Objectory as an activity
From idea to reality
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