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Second Edition now available! Real-time systems programmers face unique challenges. Qualities such as execution speed and memory size are paramount in the development of real-time systems, and performance is a fundamental aspect of correctness in this domain. Given these constraints and requirements, it is fair to say that the development of real-time systems is more challenging than that of most software systems. Yet the lack of a standard notation and design process has discouraged embedded systems developers from adopting a revolutionary new approach to software design--object technology--that has produced clearly identifiable benefits in less specialized software applications. With the development and wide adoption of a standard notation, the Unified Modified Language (UML), real-time systems developers can now avail themselves of the benefits and advantages of object technology. UML is a 3rd generation modeling language which rigorously defines the semantics of the object metamodel and provides a notation for capturing and communicating object structure and behavior. It is particularly well-suited to modeling real-time and embedded systems.Real-Time UML is the introduction that developers of real-time systems need to make the transition to object-oriented analysis and design and modeling with UML. It covers the important features of the UML and shows how to effectively use the UML to model real-time systems. The book includes special in-depth discussions of finite state machines, object identification strategies, and real-time design patterns to help beginning and experienced developers alike. 0201325799B04062001
- Sales Rank: #3323561 in Books
- Published on: 1997-12
- Original language: English
- Number of items: 1
- Dimensions: 9.25" h x 8.00" w x .75" l,
- Binding: Paperback
- 363 pages
Amazon.com Review
It's no surprise that object-oriented analysis and design can work for embedded systems--such as those in VCRs, car engines, elevators, pacemakers, and other hardware devices--which far outnumber traditional computers. That's the argument of Bruce Douglass's Real-Time UML, which presents the latest modeling techniques using the Unified Modeling Language (UML) in the context of embedded design. This book is a successful introduction to both UML and the vagaries of embedded systems, which have their own set of pitfalls and constraints for efficiency and high reliability.
Real-Time UML is good at presenting the basics of modeling objects, from class design to object behavior, with an eye for the rich set of diagrams available in UML used along the way. Examples, from elevators to medical systems, are used to illustrate the theory.
The authors are up to speed with the latest research on "patterns" (reusable higher order designs) that can be used for embedded systems--especially within the chapters on design. It's obvious from this clearly written and comprehensive book that embedded systems can benefit from the methodology and notational strengths of UML. This manual avoids the abstraction of a lot of software engineering texts and relies on some good real-world detail for its examples. It's definitely a recommended source for any embedded-systems developer who wants to ramp up on the new details of UML.
From the Inside Flap
Goals
Real-Time UML: Developing Efficient Objects for Embedded Systems is an introduction to object-oriented analysis and design for hard real-time systems using the Unified Modified Language (UML). UML is a third generation modeling language which rigorously defines the semantics of the object metamodel and provides a notation for capturing and communicating object structure and behavior. Many methodologists-including Grady Booch (Booch Method), Jim Rumbaugh (Object Modeling Technique (OMT), Ivar Jacobson (Object-Oriented Software Engineering (OOSE), and David Harel (Statecharts)-collaborated to achieve UML. A great many more participated, myself included, in the specification of the UML, and we believe that it is the leading edge in modeling for complex systems.
There are very few books on the use of objects in real-time systems and even fewer on UML. Virtually all object-oriented books focus primarily on business or database application domains and do not mention real-time aspects at all. On the other hand, texts on real-time systems have largely ignored object-oriented methods. For the most part, they fall into two primary camps: those that bypass methodological considerations altogether and focus solely on "bare metal" programming, and those that are highly theoretical with little advice for actually implementing workable systems. Real-Time UML: Developing Efficient Objects for Embedded Systems is meant to be a concise and timely bridge for these technologies, presenting the development of deployable real-time systems using the object semantics and notation of the UML. This has many advantages, including focusing the development process of real-time systems into logical, concrete steps that progress in an orderly fashion with a standardized notation. Audience
The book is oriented towards the practicing professional software developer and the computer science major, in the junior or senior year. This book could also serve as an undergraduate or graduate level text, but the focus is on practical development rather than a theoretical introduction. Very few equations will be found in this book, but more theoretical and mathematical approaches are referenced where appropriate. The book assumes a reasonable proficiency in at least one programming language and at least a cursory exposure to the fundamental concepts of both object orientation and real-time systems. Organization
The book follows the normal analysis--design--implementation approach followed by most development projects. The first chapter identifies the fundamental concepts of objects and real-time systems. The next two discuss analysis--the identification and specification of the problem to be solved. Analysis is divided into two portions: black box requirements analysis using context diagrams, use cases and scenarios (Chapter 2), and capturing the key concepts and their relationships from the problem domain (Chapter 3).
Design follows analysis and adds details as to how the analysis model should be implemented. Design is broken up into three parts, each taken up in a separate chapter--Architectural, Mechanistic, and Detailed design. The parts differ in the scope of their concerns. Architectural design deals with very broad scope strategic decisions, such as tasking models and inter-processor design. Mechanistic design focuses on how groups of objects collaborate to achieve common purposes. Both architectural and mechanistic design chapters include a number of patterns that have been found generally applicable in real-time systems. Finally, detailed design specifies the internal structure and function of individual objects.
Throughout the book, the UML notation is introduced as needed. However, a notational summary is provided in the appendix so that this book can continue to serve as a reference guide as your projects evolve. Examples
Two different approaches to examples are used in different texts. Some authors (and readers) prefer a single example taken throughout the entire book to illustrate the various concepts. The other approach is to use many different examples with the idea that it is more useful to see the concepts used in a wide variety of applications. This book uses a compromise approach. A variety of real-time examples illustrate the concepts and notation of UML in several real-time application domains, but the examples reappear in different chapters of the book. This approach reinforces the concepts by showing how they apply in various situations. Special care has been taken to select real-time examples with rich behavioral semantics, however examples which are not strictly real-time are used where appropriate. Bruce Powel Douglass, Ph.D. Summer 1997
0201325799P04062001
From the Back Cover
Second Edition
now available!
Real-time systems programmers face unique challenges. Qualities such as execution speed and memory size are paramount in the development of real-time systems, and performance is a fundamental aspect of correctness in this domain. Given these constraints and requirements, it is fair to say that the development of real-time systems is more challenging than that of most software systems. Yet the lack of a standard notation and design process has discouraged embedded systems developers from adopting a revolutionary new approach to software design--object technology--that has produced clearly identifiable benefits in less specialized software applications.
With the development and wide adoption of a standard notation, the Unified Modified Language (UML), real-time systems developers can now avail themselves of the benefits and advantages of object technology. UML is a 3rd generation modeling language which rigorously defines the semantics of the object metamodel and provides a notation for capturing and communicating object structure and behavior. It is particularly well-suited to modeling real-time and embedded systems. Real-Time UML is the introduction that developers of real-time systems need to make the transition to object-oriented analysis and design and modeling with UML. It covers the important features of the UML and shows how to effectively use the UML to model real-time systems. The book includes special in-depth discussions of finite state machines, object identification strategies, and real-time design patterns to help beginning and experienced developers alike. 0201325799B04062001
Most helpful customer reviews
7 of 7 people found the following review helpful.
If you write embedded software go and buy this now
By Daniel Moth
Simply stated the first book to devote itself to UML for real-time systems and the only author that does it. Although my background is not in the embedded world, this book introduced me to real-time systems, discussed the advantages in taking the OO approach to developing embedded systems and then explained the UML notation with the real-time extensions and a process for applying it. A MUST HAVE for every embedded developer. END
0 of 0 people found the following review helpful.
Some parts excelent, some poor
By Tom O Bjorkholm
I have mixed feelings for this book. Parts of the book are awful, other parts are really excellent. The overall impression is still that this is a book worth reading, and keeping in a bookshelf not too far away from your workplace for real time work.
The explanations about state diagrams is really good. In general the treatment of state is the strong side of the book. The book explains state machines and how they can, and cannot, be used in a good way. The book also describes two patterns for state machine design.
Most parts of the book are well written and easy to read. The design patterns described in the book are not rocket science, but they are (unlike many pattern descriptions) described in a way that is easy to read and understand.
The first chapter is awful (skip it, or read on: it will get better). The language in this chapter is dry and hard to read. There is no useful information here. The author declares that real-time design/programming is harder than desktop program design. He also declares that object-oriented programming is generally better than block-structured. The readers already knows this, or otherwise we would not be reading this book.
The remarks about C++ in the book are about 50 % accurate and 50 % false. The author seems to have missed a lot of the C++ programming paradigms that have become common during the last five years.
I had the expectation that this book would include some insight that you couldn't combine yourself from experience in desktop focused UML and traditional (block-structured, functional) real-time design. The book did not live up to this expectation. (But I guess that expectation was unrealistic.)
1 of 1 people found the following review helpful.
I have been converted.
By Jimps
Thanks to this book, I have finally taken the plunge with OOD for our latest safety critical embedded project. I am surprised at how gentle my induction has been. I had always believed that OO methods were inappropriate for real time applications but Bruce Douglass has persuaded me otherwise. He also provides the UML toolbox to pick and choose from and with these tools designs can be expressed in a pithy and unambiguous way that Douglass demonstrates clearly with many examples.
Real time concepts and descriptions, of different architectural designs for example, are made that much clearer by the use of UML. This coupled with a repetitious reinforcement of the concepts and notation of the UML itself have the effect of accelerating understanding as the book progresses.
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