Thomas Erl

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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)

Cloud Computing, SOA and Windows Azure

For a complete list of the co-authors and contributors, see the end of the article. Microsoft's Software-plus-Services strategy represents a view of the world where the growing feature-set of devices and the increasing ubiquity of the Web are combined to deliver more compelling solutions. Software-plus-Services represents an evolutionary step that is based on existing best practices in IT and extends the application potential of core service-orientation design principles. Microsoft's efforts to embrace the Software-plus-Services vision are framed by three core goals: User expe... (more)

Cloud Computing, SOA and Windows Azure - Part 3

For a complete list of the co-authors and contributors, see the end of the article. A cloud service in Windows Azure will typically have multiple concurrent instances. Each instance may be running all or a part of the service's codebase. As a developer, you control the number and type of roles that you want running your service. Web Roles and Worker Roles Windows Azure roles are comparable to standard Visual Studio projects, where each instance represents a separate project. These roles represent different types of applications that are natively supported by Windows Azure. There ... (more)

Cloud Computing, SOA and Windows Azure - Part 4

For a complete list of the co-authors and contributors, see the end of the article. The following section demonstrates the creation of a simple "Hello World" service in a Windows Azure hosted application. Note: If you are carrying out the upcoming steps with Visual Studio 2008, you will need to be in an elevated mode (such as Administrator). A convenient way of determining whether the mode setting is correct is to press the F5 key in order to enter debug mode. If you receive an error stating "the development fabric must be run elevated," then you will need to restart Visual Studi... (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)