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This single book has all you've |
by Guy Eddon, Henry Eddon
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Reviews Amazon.com Although Microsoft's Distributed Component Object Model (DCOM) is one of the most widely used component standards in the computing industry, it has a well-deserved reputation for being rather difficult to master. While many tools (such as Visual Basic) let programmers use DCOM without understanding how it works, C++ and Java programmers who need to know more will want to turn to Inside Distributed COM. This surprisingly readable reference mixes enough technical detail with actual source code drawn from C++, Java, and Visual Basic to show how DCOM really works. The authors start out simply, identifying the basics of COM running on a local machine, and run through the essentials of what COM objects are and how they promote reuse. They present the basic interfaces of COM and discuss the philosophy of COM's object design regarding containment and aggregation. (Although COM does not support inheritance, it can simulate such relationships in other ways.) After laying the theoretical groundwork, the book features several excellent nuts-and-bolts chapters that demonstrate how COM works in several programming languages: C++ (including the Active Template Library), Java (which hides many of the details of COM programming), and Visual Basic (which makes using COM transparent to programmers). The short examples drawn from each language show how COM is an essential part of the Microsoft programming languages and tools. The book moves into more of the technical aspects of COM, such as automation (for scripting COM components), connection points (for event handling), monikers (for identifying COM components regardless of their location on the network), and marshaling (which lets objects send data between objects). The authors mix in a useful amount of theory while consistently holding the reader's interest. A chapter on threading models (a difficult topic) is also particularly clear, and the authors even provide their "ten commandments" for threading models--rules that show when to use single or multiple threading apartments. Later chapters discuss distributed computing and the problems that need to be solved as COM moves to distributed systems. These chapters include the advantages to in-process servers versus stand-alone processes in distributed architectures and a full discussion of the Microsoft Interface Definition Language (IDL), which allows components to talk to one another. The book closes with new technologies, including how developers can benefit from using Microsoft Transaction Server for robust transaction management and how the emerging COM+ standard will add even more to the mix, with services that rival CORBA for enterprise-wide distributed computing. Inside Distributed COM may be the best guide to understanding COM, whether you are running it on a single machine or multiple machines. The authors succeed in highlighting what you should understand about this important technology in order to become a more effective developer or information services manager. Book Description Synopsis
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