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The Four Tenets of Service Orientation
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So what exactly are the characteristics that make services a better metaphor for describing distributed applications This is where the well-traveled Four Tenets of Service Orientation come into play. Understand, these are Microsoft-defined tenets, so they describe how Microsoft views SO/A. Also, these tenets have been bouncing around cyberspace for quite some time, so in-depth discussions and arguments about each one are only an Internet search away.
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With that last point in mind, our goal in this section is to cover each tenet in just enough detail to satisfy the curiosity of someone fairly new to the SO/A discussion. Others may (and likely will) skip this section.
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Tenet One: Boundaries Are Explicit
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Many current distributed technologies boast of a feature called location transparency. This is the notion that the code you write to invoke a procedure is the same regardless of where that function actually lives. For example, it may be executing in process, out of process but on the same physical machine, or out of process and running on a different machine. Of course, in the distributed object paradigm, the procedure is really a method within an object, so the location of the method follows the object. And that, of course, brings us back to the issues around the object metaphor. An object assumes that all communication with its consumer is simple and local. In other words, it assumes the best case scenario. These assumptions caused a lot of pain, particularly in the early days of DCOM and CORBA, as developers took their local, chatty, and stateful objects and relocated them to a remote server without modification. Services, on the other hand, take an entirely different approach. Around any service implementation lies a logical boundary that separates the service from the outside world. From the service point of view, the mechanisms used beyond this boundary to communicate with its consumers are completely unknown. The communication may need to cross large physical distances, multiple networks, various trust boundaries, etc. Or the communication may simply need to cross the service boundary to an in-proc consumer. Since these communication details are unknown to the service, it assumes the worst case scenario. That is, it assumes that each communication between it and the consumer is extremely costly. Therefore, SO ensures that each boundary crossing does as much work as possible. To that end, a service uses explicit message passing to communicate outside of its boundary, where each message contains all the data required to complete the operation.
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Tenet Two: Services Share Schema and Contract
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No matter what distributed technology you use, each one must provide some way for the consumer to know what operations are available, what inputs are needed and what their structure is, and what the structure of the return is. In .NET Remoting, for example, this information is deployed to the consumer in the form of a shared .NET assembly that contains the remote object interfaces or even their concrete classes. This complicates versioning and makes interoperation with non-.NET platforms impossible without bridging tools. In contrast, services follow the Web Service approach and provide their structural and operational details using schemas and contract. In Web Service implementations, the schema and contract are typically contained within a Web Service Description Language (WSDL) document that the consumer can retrieve. And although SO doesn t require the use of WSDL, early implementations do use it.
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Tenet Three: Service Compatibility Is Based on Policy
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In certain cases, the service consumer may need to make specific demands on the service before engaging in any conversation (or vice versa). For example, the consumer may be a service itself and running within the context of a larger transaction. Therefore, the consumer must ensure that the remote service supports transactions. This transaction requirement represents
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