Requirements Modelling and Specification for Service by Ian Graham

By Ian Graham

Many software program builders frequently confuse specifications engineering with software program specification and, accordingly, construct unusable platforms, regardless of assembly requirements. Bringing jointly the entire strategies wanted by way of the trendy software program developer, here's a sensible instruction manual to requisites engineering and structures specification for builders construction platforms inside a carrier orientated structure. It introduces the recommendations of SOA and suitable criteria and know-how, akin to net prone and ESBs, after which offers a variety of glossy necessities engineering suggestions.

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Additional info for Requirements Modelling and Specification for Service Oriented Architecture

Sample text

The key technology to master when embarking on an SOA project is modelling. Modelling is core to defining good, sharable, reusable, composable, autonomous services. Standards and, in particular, web services standards, provide core enabling technology for SOA. The potential benefits of adopting service oriented architecture may be summarized as follows: ■ ■ ■ ■ ■ ■ Faster development. Faster maintenance. More reusable business logic. Greater consistency across the enterprise. Better separation of concerns.

The IT function can then adapt to changing requirements more easily. It should also supply a service to the business; the operations that make up the service are about supporting the business, not the user interface. Although a service is just an interface, it will thus be implemented by software components that implement a reusable business function, such managing customers or managing customer accounts. Services are defined by their interfaces, which describe what the services can do. How the service works is hidden inside the components that provide the service.

Though built on similar principles, SOA is not the same as eb services. SOA is independent of any specific technologies. A service is a unit of work carried out by a service provider to achieve some desired result for the service consumer. A service is a loosely coupled black box that can be found and (re)used as part of a current or new software application. The more loosely coupleable it is, the more (re)useable it is. Such black boxes can be assembled in different ways to do business in different ways.

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