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Transactional COM+: Building Scalable Applications, by Tim Ewald
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Building scalable distributed systems that efficiently perform enterprise-critical functions is incredibly challenging. Microsoft developed COM+ to help. COM+ is a sophisticated runtime environment for COM components. It is designed to make the development of scalable systems easier and is the foundation for higher-level frameworks such as BizTalk and Site Server Commerce Edition. But you cant use COM+ effectively if you dont understand how it works. Transactional COM+ explains how COM+ works and shows readers how to use the technology to its fullest potential as a framework for developing scalable applications. It examines the theory behind COM+, including the nature of scalability, why traditional object-oriented models are inappropriate for scalable systems, and the importance of transactions. The book explores how the two basic atoms of context and causality are used to implement COM+ runtime services. It introduces apartments and activities and the role they play in controlling concurrency in a COM+ process. It also introduces transaction streams and explains how they are used to integrate objects and transactions. Ewald shows how just-in-time activation and object pooling tog
- Sales Rank: #4089656 in Books
- Published on: 2001-03-16
- Original language: English
- Number of items: 1
- Dimensions: 9.00" h x 1.20" w x 7.30" l, 1.73 pounds
- Binding: Paperback
- 464 pages
Most helpful customer reviews
12 of 12 people found the following review helpful.
The real deal
By drowninginbooks
I'm a professional software engineer with twenty years experience, so I've read my share of computer books and dipped into hundreds more.
This is quite simply one of the best computer books I've ever encountered. A classic.
So many computer books are just rehashes of vendor documentation, vague or misleading or wrong in all the same places the vendor documentation is. This book is different. The author clearly has tested every assertion with his own "spelunking" code. He explores every nook and cranny of COM+, and every sentence is carefully considered, clearly stated, and as far as I can tell, absolutely accurate. There's no "hand-waving", no BS, it's just absolutely solid. Crystal clear, razor sharp.
It's a shame, really, that the title is "Transactional" COM+. I had the book for quite a while before I got around to reading it, because the title misled me into thinking that if I wasn't using transactions then it didn't apply to me. Wrong! This book covers COM+ generally, not just transactions, with particular emphasis on the elements of COM+ that are most likely to affect scalability of middle tier applications. Want to know what threading models to use in components called from ASPs? Want to really understand why? This is where to find out.
It's a serious work and really deserves to be studied with some care, but whatever effort you put into studying it will be amply rewarded.
If only all computer book authors were as smart, as conscientious, and as intellectually honest as Tim Ewald. Bravo!
15 of 15 people found the following review helpful.
After reading this book there's only one question left....
By A Customer
...What the hell is the IMarshal3 interface?
The previous reviewer seems to be disappointed that most of the book's sample code is written in C++. Alas, at this time (and until the moment, perhaps in the second release of .NET, when the COM+ component services are implemented in managed code) a significant part of the COM+ infrastructure is simply inaccesible from Visual Basic.
As the title and the preface state, the book's focus is on transactions in the COM+ environment of Windows 2000. Perhaps a list of "requirements", and don't take these too serious, will decrease the number of disappointed readers:
The reader should:
-know the basics of COM
-be comfortable reading C++ code (Although VB or JScript is used now and then)
-know, or read up on, the ATL util classes (CComPtr, CComBSTR)
-same thing for OLE DB (& the ATL consumer wrappers)
What the book does not cover (and again, this is stated in the preface):
-LCE (COM+ Events) and QC
-CRMs
-Security topics
The structure loosly resembles "Essential COM". (that's a compliment :-) )
In my opinion the book delivers on it's promises.
7 of 8 people found the following review helpful.
Writing a COM+ application ? You _NEED_ this book!!
By Richard Anderson
If you're an architect or developer working on a COM+ application that needs to be scalable, you should read this book. If defines what scalability is, explains how COM+ applications should be written to achieve scalability, and explains in clear and concise detail, COM+ concepts such as apartments, contexts, activities and causality.
A lot of people just don't get COM+. Whether this is due to the absolute trash that is written about COM+ in a lot of others books or MSDN, I don't know. You simply cannot stick all of your components into a COM+ application and expect it to scale. It just doesn't work like that. Even if you think you've got your design right, there are lots of hidden caveats to catch you out. You need to understand what COM+ does with your components, how it manages context, the cost of this management vs traditional non-configured components etc
This book presents a clear picture of how to do things the right way. It starts at a nice high level, and drills down into more detail as the chapters fly past. Further more, it gives you a warm feeling that the author really has worked on real world applications, and not just written `play and experimental' applications. Other books have come close to this (the Richard Grimes and James Conard books sprint to mind) but this is the best to date.
In Summary....
If you think you know COM+ inside out, read this book and see how your understanding of COM+ fits with what Tim has to say. I'm glad to say I fully agreed with nearly every word, and couldn't put the book down. I learnt a couple of things too, so I'll certainly be changing our applications in future releases.
Thank you Tim.
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