C.5 A profile for the Service Autonomy principle. in .NET Printer ANSI/AIM Code 128 in .NET C.5 A profile for the Service Autonomy principle.

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Table C.5 A profile for the Service Autonomy principle. using vs .net todraw code 128b with web,windows application GS1 General Specifications Appendix C: Service-Orientation Principles Reference Service Statelessness Short Definition Long Definition Services mi .net vs 2010 Code 128 Code Set C nimize statefulness. Services minimize resource consumption by deferring the management of state information when necessary.

To increase service scalability. To support the design of agnostic service logic and improve the potential for service reuse..

Goals Design Characteristics What makes t his somewhat of a unique principle is the fact that it is promoting a condition of the service that is temporary in nature. Depending on the service model and state deferral approach used, different types of design characteristics can be implemented. Some examples include: Highly business process-agnostic logic so that the service is not designed to retain state information for any specific parent business process.

Less constrained service contracts so as to allow for the receipt and transmission of a wider range of state data at runtime. Increased amounts of interpretative programming routines capable of parsing a range of state information delivered by messages and responding to a range of corresponding action requests..

Implementation Requirements Although sta te deferral can reduce the overall consumption of memory and system resources, services designed with statelessness considerations can also introduce some performance demands associated with the runtime retrieval and interpretation of deferred state data. Here is a short checklist of common requirements that can be used to assess the support of stateless service designs by vendor technologies and target deployment locations: The runtime environment should allow for a service to transition from an idle state to an active processing state in a highly efficient manner..

Service Statelessness Enterprise -level or high-performance XML parsers and hardware accelerators (and SOAP processors) should be provided to allow services implemented as Web services to more efficiently parse larger message payloads with less performance constraints. The use of attachments may need to be supported by Web services to allow for messages to include bodies of payload data that do not undergo interface-level validation or translation to local formats. The nature of the implementation support required by the average stateless service in an environment will depend on the state deferral approach used within the service-oriented architecture.

. Table C.6 A profile for the Service Statelessness principle. Appendix C: Service-Orientation Principles Reference Service Discoverability Short Definition Long Definition Services ar e discoverable. Services are supplemented with communicative meta data by which they can be effectively discovered and interpreted. Services are positioned as highly discoverable resources within the enterprise.

The purpose and capabilities of each service are clearly expressed so that they can be interpreted by humans and software programs. Achieving these goals requires foresight and a solid understanding of the nature of the service itself. Depending on the type of service model being designed, realizing this principle may require both business and technical expertise.

. Goals Design Characteristics Service co Code 128 Code Set C for .NET ntracts are equipped with appropriate meta data that will be correctly referenced when discovery queries are issued. Service contracts are further outfitted with additional meta information that clearly communicates their purpose and capabilities to humans.

If a service registry exists, registry records are populated with the same attention to meta information as just described. If a service registry does not exist, service profile documents are authored to supplement the service contract and to form the basis for future registry records. (See 15 in SOA Principles of Service Design for more details about service profiles.

). Service Discoverability Implementation Requirements The existe nce of design standards that govern the meta information used to make service contracts discoverable and interpretable, as well as guidelines for how and when service contracts should be further supplemented with annotations. The existence of design standards that establish a consistent means of recording service meta information outside of the contract. This information is either collected in a supplemental document in preparation for a service registry, or it is placed in the registry itself.

You may have noticed the absence of a service registry on the list of implementation requirements. As previously established, the goal of this principle is to implement design characteristics within the service, not within the architecture..

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