Advanced CORBA Programming with C++
- By Michi Henning, Steve Vinoski
- Published Feb 17, 1999 by Addison-Wesley Professional. Part of the Addison-Wesley Professional Computing Series series.
- Copyright 1999
- Dimensions: 7-3/8x9-1/4
- Pages: 1120
- Edition: 1st
- ISBN-10: 0-201-37927-9
- ISBN-13: 978-0-201-37927-3
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Product Author Bios
Michi Henning is Chief Scientist of ZeroC, Inc, where he is responsible for research and development of next-generation middleware technologies. Michi has spent many years on CORBA-related research, as well as CORBA consulting and training for international customers. He has contributed to numerous OMG specifications, was a member of the OMG Architecture Board, and was chair of the OMG's C++ Revision Task Force.
Steve Vinoski is Chief Engineer of Product Innovation for IONA Technologies, PLC. He has coauthored several important OMG specifications, including the OMG IDL C++ Language Mapping specification, and he previously served as the chair of the OMG C++ Revision Task Force. Steve is also the author of the "Toward Integration" middleware column in IEEE Internet Computing, and coauthor of the "Object Interconnections" column in the C/C++ Users Journal. He frequently presents at middleware conferences around the globe.
- In-depth coverage of IDL, including common idioms and design trade-offs.
- Complete and detailed explanations of the Life Cycle, Naming, Trading, and Event Services.
- Discussion of IIOP and implementation repositories.
- Insight into the dynamic aspects of CORBA, such as dynamic typing and the new DynAny interfaces.
- Advice on selecting appropriate application architectures and designs.
- Detailed, portable, and vendor-independent source code.
Here is the CORBA book that every C++ software engineer has been waiting for. Advanced CORBA® Programming with C++ provides designers and developers with the tools required to understand CORBA technology at the architectural, design, and source code levels. This book offers hands-on explanations for building efficient applications, as well as lucid examples that provide practical advice on avoiding costly mistakes. With this book as a guide, programmers will find the support they need to successfully undertake industrial-strength CORBA development projects.
The content is systematically arranged and presented so the book may be used as both a tutorial and a reference. The rich example programs in this definitive text show CORBA developers how to write clearer code that is more maintainable, portable, and efficient. The authors' detailed coverage of the IDL-to-C++ mapping moves beyond the mechanics of the APIs to discuss topics such as potential pitfalls and efficiency. An in-depth presentation of the new Portable Object Adapter (POA) explains how to take advantage of its numerous features to create scalable and high-performance servers. In addition, detailed discussion of advanced topics, such as garbage collection and multithreading, provides developers with the knowledge they need to write commercial applications.
- In-depth coverage of IDL, including common idioms and design trade-offs
- Complete and detailed explanations of the Life Cycle, Naming, Trading, and Event Services
- Discussion of IIOP and implementation repositories
- Insight into the dynamic aspects of CORBA, such as dynamic typing and the new DynAny interfaces
- Advice on selecting appropriate application architectures and designs
- Detailed, portable, and vendor-independent source code
Source Code and Online Resources
Source code for the examples in the book
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31 of 31 people found the following review helpful
The only alternative is to read the CORBA spec,
This review is from: Advanced CORBA Programming with C++ (Paperback)I have worked extensively on ORB development, and I can honestly say that this is the only book I have seen that I refer to regularly other than the CORBA spec. It is the only text that is (mostly) current with the spec, and it provides real insights into many frequently asked CORBA questions, such as object reference identity and persistence, memory management, and the POA.
Most ORBs don't have the POA yet; they will by mid-2000. It was an important and correct decision by the authors to include it instead of the BOA, most of the details of which are vendor-specific anyway (that's why the POA exists). Note to BOA lovers: sorry, the BOA is no longer part of the spec. ORB vendors are free to keep it around, and many do, but it's only because they're nice. The POA is so vastly superior that the only reason you would use the BOA is if you have an existing code base to maintain.
This is not a book for beginners, grazers, or wanna-bes; it is a book for serious, working... Read more
22 of 23 people found the following review helpful
Well planned,focussed presentation of the topics-Very good,
By A Customer
This review is from: Advanced CORBA Programming with C++ (Paperback)The book by Michi Henning and Steve Vinosky has hit the market at the right time. There is no other book that describes the programming aspects of Corba in such an elegant manner. In brief, this book is Very good, A must have kind of book, Targeted at intermediate level CORBA programmer (though I feel a beginner can certainly read it as far as that person has some good background in C++) The topic "Advanced programming...." may be a bit misleading because, this book talks much about the basic stuff of CORBA rather than on the advanced, and not frequently used features like DII,DSI etc. I see this book as the one with a very down-to-earth approach that gives a lot of precious details about CORBA programming, rather than some thing that talks about very advanced stuff. IMHO, all that one needs is just a good grasp of C++ inorder to follow this book. The plus points of this book ar: a) The presentation is very clear and focussed b) Explains the nitty-gritty details... Read more
18 of 20 people found the following review helpful
Thorough, well organized,
This review is from: Advanced CORBA Programming with C++ (Paperback)I cannot believe that some people gave such poor review just because they coudln't get it. The book is titled as advanced so it's not supposed to be a book for novices. I don't have much knowledge of CORBA but find this books not so hard to follow. If you know C++ and want to learn CORBA, I think that this is a great book to read.
› See all 30 customer reviews...
Praise For Advanced CORBA Programming with C++
"It's positively great. We finally have something that actually covers the topic from the point of view of the standard, rather than a proprietary implementation." - Jon Biggar, Floorboard Software
"Henning and Vinoski have written the book on CORBA with C++." - Douglas C. Schmidt, Washington University, St. Louis
"I received a copy of the Henning/Vinoski book on CORBA, and I have not been able to put it down. This is, by far, the best book that has been written on CORBA (take my word for it, I have read them all.)" - David Cyganski, Worcester Polytechnic Institute
"Let me congratulate you (the authors) for writing the excellent book Advanced CORBA Programming with C++. By far the best and most detailed book I have read so far on topic of CORBA. This book will go a long way in creating more genuine CORBA-literate programmers." - Prakash N. Rohra
For years, both of us have been (and still are) teaching CORBA programming with C++ to software engineers all over the world. One of the most frequently asked questions in our courses is, ''Where can I find a book that covers all this?'' Although many books have been written about CORBA, most of them focus on high-level concepts and do not address the needs of software engineers. Even though CORBA is conceptually simple, the devil lies in the detail. Or, more bluntly, books focusing on high-level concepts are of little use when you must find out why your program is dumping core.
To be sure, there are resources available about CORBA, such as newsgroups, Web pages, and the Object Management Group (OMG) specifications. However, none of them really meets the needs of a programmer who must get the code to work (and preferably by yesterday). We wrote this book so that there would finally be a tutorial and reference that covers CORBA programming with C++ at the level of detail required for real-life software development. (And, of course, we wrote it so that we would have a good answer for our students.)
Writing such a book is a tall order. Explaining the CORBA specification and APIs is one thing, and it's a necessary part of the book. However, knowing the various APIs will not, by itself, make you a competent programmer (only a knowledgeable one). To be competent, you need not only knowledge of the mechanics of the platform but also an understanding of how the different features interact. You must combine them effectively to end up with an application that performs and scales well and is maintainable, extensible, portable, and deployable.
To help you become competent (as opposed to merely knowledgeable), we go beyond the basics in a number of ways. For one thing, we provide advice as to what we consider good (and bad) design, and we make no attempt to hide problems with CORBA (which, like any other complex software system, has its share of wrinkles). Second, we go beyond the APIs by explaining some of CORBA's internal mechanisms. Even though you can use an ORB without knowing what goes on under the hood, it is useful to understand these mechanisms because they have a profound influence on how well (or how poorly) an application will perform. Third, we devote considerable space to a discussion of the merits of various design decisions; typically, when a design provides a gain in one area it also involves a loss in another. Understanding these trade-offs is crucial to building successful applications. And fourth, where appropriate, we make recommendations so that you are not left without guidance.
Inevitably, our approach required us to make value judgments, and, just as inevitably, a number of people will disagree with at least some of the recommendations we make. Whether you agree or disagree with us, you should still profit from our approach: if you agree, you can stick to the advice we give; if you disagree, the discussion will have at least encouraged you to think about the topic and form your own opinion. Either way, you are better off than you would be with a book that just dumps the facts on you without providing the deeper insight required to use them.
This book is not a beginner's book, in the sense that we do not devote much space to explaining the structure of the OMG or the pecification adoption process. We also do not provide a high-level overview of the architectural goals of CORBA or all its services and facilities (see 31 for a high-level overview). Instead, we assume that you want to know how to write real CORBA applications with C++. Despite the lack of overview material, you should be able to follow the material even if you have never seen CORBA before. If you have experience in network programming or have used another RPC platform, you will find it easy to pick things up as you go.
Much of this book consists of source code, so we expect you to be literate in C++. However, you do not need to be a C++ guru to follow the code. We have avoided obscure or little-understood features of C++, preferring clarity to cleverness. If you understand inheritance, virtual functions, operator overloading, and templates (not necessarily in intricate detail), you will have no problems. Some of the source code uses the Standard Template Library (STL), which is now part of the ISO/IEC C++ Standard. We have limited ourselves to very simple uses of this library, so you should be able to understand the source code even if you have never seen STL code before.
If you have never written threaded code, you will find the chapter on writing threaded servers tough going. Unfortunately, there was not enough room to provide an introduction to programming with threads. However, the Bibliography lists a number of excellent books on the topic.
Despite our best efforts to show realistic and working source code, we had to make a number of compromises to keep code examples understandable and of manageable size. When we demonstrate a particular feature, we often use straightline code, whereas in a realistic application the code would better be encapsulated in a class or helper function. We have also minimized error handling to avoid obscuring the flow of control with lots of exception handlers. We chose this approach for didactic purposes; it does not imply that the code pretends to reflect best possible engineering practice. (The Bibliography lists a number of excellent books that cover source code design in great detail.)
Scope of this Book
OMG members are continually improving CORBA and adding new features. As a result, available ORB implementations conform to different revision levels of the specification. This book covers CORBA 2.3. (At the time of writing, CORBA 2.3 is being finalized by the OMG.) Throughout the text, we indicate new features that may not yet be available in your ORB implementation; this allows you to restrict yourself to an earlier feature set for maximum portability.
Despite its size, our main regret is that this book is too short. Ever-increasing page counts and ever-closer deadlines forced us to drop chapters on the Dynamic Invocation Interface (DII), the Dynamic Skeleton Interface (DSI), and the Interface Repository (IFR). Fortunately, the vast majority of applications do not need those features, so dropping these chapters is not much of a loss. If your application happens to require the dynamic interfaces, the background we provide here will enable you to easily pick up what you need from the CORBA specification. Another feature notable by its absence is Objects-By-Value (OBV). We chose not to cover OBV because it is too new for anyone to have any substantial engineering experience with it. In addition, at the time of writing, there are still a number of technical wrinkles to be ironed out and we expect the OBV specification to undergo further changes before it settles down.
Size and time limitations also meant that we could not cover every possible CORBA service. For example, we did not cover the Transaction Service or Security Service because each of them would require a book of its own. Rather than being complete, we have restricted ourselves to those services that are most essential for building applications: the Naming, Trading, and Event Services. We cover those services in more detail than any other publication we are aware of.
An important part of this book is the presentation of the Portable Object Adapter (POA), which was added in CORBA 2.2. The POA provides the server-side source code portability that was missing from the (now deprecated) Basic Object Adapter. The POA also provides a number of features that are essential for building high-performance and scalable applications. We have therefore paid particular attention to showing you how to use the POA effectively in your designs.
Overall, we believe this book offers the most comprehensive coverage to date of CORBA programming with C++. We have arranged the material so that you can use the book both as a tutorial and as a reference. Our hope is that after the first reading, you will have this book open at your side when you are sitting at your terminal. If so, we will have achieved our goal of creating a book that is used by real engineers to build real applications.
As with any book, the authors are only part of the story, and this is the place to thank the large number of people who have contributed to making this book possible. At Addison Wesley Longman, Mike Hendrickson and our editor, Deborah Lafferty, believed us when we told them that this book needed to be written. Without their faith in us, you would not be reading this. Brian Kernighan reviewed several drafts and made us redo the job where necessary. His clarity of thought and critical eye have greatly improved this book. John Fuller and Genevieve Rajewski, our production editors, put up with all our naive questions and enabled two amateurs to take a book to camera-ready stage. Our copy editor, Betsy Hardinger, edited every page in this book with meticulous attention to detail. Her efforts taught us more about clarity of style than we thought possible.
Particular thanks go to Colm Bergin, Jonathan Biggar, Bart Hanlon, Jishnu Mukerji, and Doug Schmidt, our expert reviewers. They read the entire manu script and spotted many problems that would have otherwise gone unnoticed. Their comments kept us honest throughout. Alan Shalloway reviewed the book from the perspective of a newcomer and made valuable suggestions on how to improve the presentation of some of the more difficult topics.
Todd Goldman and Tim Gill from Hewlett-Packard gave us permission to draw on earlier ORB training material written by Michi. John Vinoski and Dan Rabideau of Green Bay Engraving take credit for designing the Mabius strip on the cover.
We are grateful to Steve's employer, IONA Technologies, for allowing us to use the next generation of their Orbix product (called ''ART'') to develop and test our code examples. Their generosity provided us with the opportunity to make sure that our examples were correct and functional. The fact that ART conforms to CORBA 2.3 allowed us to target the most recent version of the CORBA specification available as of this writing.
We also would like to thank the many contributors to comp.object.corba and the corba-dev mailing list. The discussions there have influenced much of the content of this book.
A number of people have provided feedback, corrections, and constructive criticism since the first printing of this book. Rather than list them all here (and have to keep updating this Preface for each new printing), we have placed a list of everyone who contributed at http://www.triodia.com/staff/michi/advanced_corba/acknowledgments.html. Our thanks go to all these people for helping to make this a better book.
I would like to thank my former employer, DSTC Pty Ltd, for providing me with an environment that was conducive to writing. Joachim Achtzehnter, Martin Chilvers, Wil Evers, Ted McFadden, and Michael Neville reviewed parts of the manuscript and made valuable suggestions for improvement. Particular thanks go to David Jackson, who read all my drafts and made sure that loose ends were not allowed to remain hanging. Finally, I would like to thank my wife, Jocelyn, and our son, Tyson, for their love and encouragement. Without their support and patience, this book would have never been written.
I would like to thank my employer, IONA Technologies, for supporting my efforts to write this book, which occasionally kept me away from the office. In particular, I would like to thank Barry Morris for his support and encouragement, Stephen Keating for taking up the slack when I had to miss work because of all-night writing sessions, and the whole IONA Boston product development team for their patience and support.
I would also like to thank Bart Hanlon, who not only reviewed this book but also was my manager at my former employer, for continually encouraging me for several years to tackle this project and for teaching me a lot about tackling projects in general. In the technical realm, I have learned from many people over the course of my career, but I owe much to John Morris, Craig Bardenheuer, Denis deRuijter, Dale LaBossiere, Tom Moreau, and Bob Kukura, who at one time or another greatly influenced my education in the realms of distributed systems and engineering in general. I would also like to thank my C++ Report co-columnist, Doug Schmidt, a true technical visionary whose work in object-oriented network programming, C++ frameworks, and CORBA has paved the way for books such as this one. He not only helped review this book, but also agreed to let me use material from our columns in writing it.
Finally, without the support of my family, I would have never been able to even consider writing this book. I'd like to thank my wife, Cindy, and our children, Ryan and Erin, for putting up with my extremely long hours and days of writing and working. Thanks also to my parents, Ed and Dooley, who have always supported me with their seemingly limitless patience and love. I also owe my brother, John, a special thanks for his wonderful artwork on our book cover.
Michi Henning and Steve Vinoski
Table of Contents
I. INTRODUCTION TO CORBA.
II. CORE CORBA.
III. CORBA MECHANISMS.
IV. DYNAMIC CORBA.
VI. POWER CORBA.
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