SOA as a precursor to the cloud in .NET framework

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SOA as a precursor to the cloud
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of them unassociated peers) in a relatively ad hoc way with the intent driven by newly emergent requirements. This is why services must be much larger units of functionality than traditional functions or classes, lest the sheer complexity of thousands of such granular objects overwhelm the application designer. Programmers develop the services themselves using traditional languages such as Java, C, and C++. SOA services feature loose coupling, in contrast to the functions that a linker binds together to form an executable to a dynamically linked library, or to an assembly. SOA services also run in safe wrappers (such as Java or .NET) and in other programming languages that manage memory allocation and reclamation, allow ad hoc and late binding, and provide some degree of indeterminate data typing.
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SOA and web services
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Web services can implement a SOA. Web services make functional building blocks accessible over standard internet protocols (such as HTTP) independent of platforms and programming languages. These services can represent either new applications or wrappers around existing legacy systems to make them network-enabled. Each SOA building block can play one or both of two roles: service provider or service consumer.
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SERVICE PROVIDER
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A service provider creates a web service and possibly publishes its interface and access information to a service registry. Each provider must decide which services to expose, how to make trade-offs between security and easy availability, and how to price the services or (if no charges apply) exploit them for other value. The provider also has to decide what category the service should be listed in for a given broker service and what sort of trading partner agreements are required to use the service. It registers what services are available within it and lists all the potential service recipients. The implementer of the broker then decides the scope of the broker. You can find public brokers through the internet, whereas private brokers are only accessible to a limited audience for example, users of a company intranet. Furthermore, you must decide on the amount of offered information. Some brokers specialize in many listings. Others offer high levels of trust in the listed services. Some cover a broad landscape of services, and others focus within an industry. Some brokers catalog other brokers. Depending on the business model, brokers can attempt to maximize look-up requests, number of listings, or accuracy of the listings. The Universal Description Discovery and Integration (UDDI) specification defines a way to publish and discover information about web services. Other service broker technologies include (for example) Electronic Business using eXtensible Markup Language (ebXML).
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The service consumer or web service client locates entries in the broker registry using various find operations and then binds to the service provider in order to invoke one of its web services. Whichever service the service consumers need, they have to take it
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Achieving high reliability at cloud scale
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into the brokers, bind it with respective service, and then use it. They can access multiple services if the service provides multiple services. Note that Amazon s cloud services are called Amazon Web Services, and Amazon is a web service provider in the way described here.
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SOA and cloud computing
SOA and cloud computing can be paired to gain the benefits both of service deployments and of the scale and economics of the cloud. With cloud computing, enterprises can access services hosted on third-party servers over the internet. With SOA, enterprises use integrated application services in a more lightweight fashion than traditional application platforms. Because cloud computing is a way of creating a system in which some or all of its IT resources exist within a third-party cloud computing resource, such as Amazon EC2 or Force.com, cloud computing can involve part or all of an architecture. The core difference is that the system is extended to resources that you don t own or host locally. Putting this more simplistically, SOA is all about the process of defining an IT solution or architecture, whereas cloud computing is an architectural alternative. We can say that SOA can t be replaced by cloud computing. Most cloud computing solutions are defined through SOA. They don t compete they re complementary notions. Adopting SOA can prepare an enterprise for cloud computing by showing what challenges the organization faces internally in supporting service components challenges that using cloud services will exacerbate. The service orientation in SOA and the cloud make for similarities, such as both concepts requiring a governance layer and a strong understanding of processes. Both the cloud and SOA determine what some of the major reusable components are and what the right technologies to run large-scale components over open networks are. An organization that has moved toward SOA in a modular fashion is in a better position to move modules to the cloud. Further, the cloud serves as a good way to deploy services in an SOA environment. SOA and the cloud support each other but aren t based on the same ideas. Cloud computing is a deployment architecture, not an architectural approach for how to architect your enterprise IT, whereas SOA is. Components that reside on different computers (some or all of which are in the cloud) and must communicate over the network potentially over the public internet require communication between those components (or processes). It s important that your understanding of interprocess communication is current. The next section delves into a typical type of interprocess communication used in the cloud.
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