e-book Service Oriented Architecture

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A service must have some sort of description which describes what the service is about.

Service-Oriented Architecture

This makes it easier for client applications to understand what the service does. Loose Coupling — Less dependency on each other. This is one of the main characteristics of web services which just states that there should be as less dependency as possible between the web services and the client invoking the web service. So if the service functionality changes at any point in time, it should not break the client application or stop it from working. Service Abstraction - Services hide the logic they encapsulate from the outside world. The service should not expose how it executes its functionality; it should just tell the client application on what it does and not on how it does it.

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Service Reusability - Logic is divided into services with the intent of maximizing reuse. In any development company re-usability is a big topic because obviously one wouldn't want to spend time and effort building the same code again and again across multiple applications which require them.

Web Technologies

Hence, once the code for a web service is written it should have the ability work with various application types. Service Autonomy - Services should have control over the logic they encapsulate. The service knows everything on what functionality it offers and hence should also have complete control over the code it contains. Service Statelessness - Ideally, services should be stateless. This means that services should not withhold information from one state to the other. This would need to be done from either the client application. An example can be an order placed on a shopping site.

Now you can have a web service which gives you the price of a particular item. But if the items are added to a shopping cart and the web page navigates to the page where you do the payment, the responsibility of the price of the item to be transferred to the payment page should not be done by the web service.

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Instead, it needs to be done by the web application. Service Discoverability - Services can be discovered usually in a service registry.

Service-Oriented Architecture (SOA) Definition

We have already seen this in the concept of the UDDI, which performs a registry which can hold information about the web service. Service Oriented Architecture SOA is an architectural paradigm for defining how people, organizations and systems provide and use services to achieve results. A service is an offer of value to another through a well-defined interface and available to a community which could be the general public. A service results in work provided to one by another. Service Oriented Architecture SOA is a way of organizing and understanding representations of organizations, communities and systems to maximize agility, scale and interoperability.

The SOA approach is simple - people, organizations and systems provide services to each other. These services allow us to get something done without doing it ourselves or even without knowing how to do it - enabling us to be more efficient and agile.

Service-oriented architecture (SOA) overview

Services also enable us to offer our capabilities to others in exchange for some value - thus establishing a community, process or marketplace. The SOA paradigm works equally well for integrating existing capabilities as for creating and integrating new capabilities.

In modeling and developing a complete Service Oriented Architecture in Enterprise Architect, you can work with any or all of:.