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Thomas Erl

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Top Stories by Thomas Erl

Many are comparing notes on two well-publicized paths to achieving SOA. The bottom-up approach is currently the most common variety, where Web services are created on an "as need" basis to fulfill mostly integration-related requirements. These services are typically application specific and simply re-create traditional integration channels over the open Web services communication framework. The top-down approach, on the other hand, is one of analysis, deep thought, and patience. Service-orientation is infused into the business process layer so that services can be modeled in alignment with business models. The models themselves may need to be built or further refined in order to fully incorporate service-orientation principles. Then, of course, there's the middle ground - an approach that tries to balance the requirements of the top-down strategy with the efficiency... (more)

Book Excerpt: Service-Oriented Computing Fundamentals

This excerpt describes fundamental terms and concepts associated with service-oriented computing, including those related to service-oriented architecture, service-orientation, and cloud computing. Service-Oriented Computing Service-oriented computing is an umbrella term that represents a new generation distributed computing platform. As such, it encompasses many things, including its own design paradigm and design principles, design pattern catalogs, pattern languages, a distinct architectural model, and related concepts, technologies, and frameworks. Service-orientation (explai... (more)

Introducing SOA Design Patterns

Originally inspired by techniques used to design buildings and cities, and popularized by the Gang of Four during the mainstream emergence of object-orientation, design patterns have seen us through the various shifts in architecture, technology, and, of course, design. Pattern catalogs have periodically emerged, one building on the other, and each revealing a set of problem-solving techniques and providing invaluable insights as to how and when those techniques should be used to help us attain our design goals. SOA has its own history, having risen out of a haze of ambiguity to e... (more)

Cloud Computing, SOA and Windows Azure - Part 2

For a complete list of the co-authors and contributors, see the end of the article. Windows Azure Platform Overview The Windows Azure platform is an Internet-scale cloud computing services platform hosted in Microsoft data centers. Windows tools provide functionality to build solutions that include a cloud services operating system and a set of developer services. The key parts of the Windows Azure platform are: Windows Azure (application container) Microsoft SQL Azure Windows Azure platform AppFabric The infrastructure and service architectures that underlie many of these nati... (more)

Exclusive SOA Web Services Journal Briefing – Thomas Erl On SOA

With the unwavering prominence of service-oriented architecture (SOA) there is an increasing interest in understanding what exactly it means for something to be considered "service-oriented." Thomas Erl recently completed a lengthy research project for SOA Systems Inc. into the origins of SOA and the current state of service-orientation among all primary SOA technology platforms. This body of work contributed to the mainstream SOA methodology developed by SOA Systems and was also documented in Thomas's new book, Service-Oriented Architecture: Concepts, Technology, and Design. We ... (more)