Service Provider Interface: Creating Extensible Java Applications - Developer.com



Service Provider Interface: Creating Extensible Java Applications - Developer.com

An application is an aggregation of cohesive services. While an application offers a broader set of functionality in terms of application programming interfaces (APIs) and classes, a service provides access to some specific application functionality or feature. The service defines the interfaces for the functionality and a way to retrieve an implementation. For example, consider an application that provides a variety of information about a geographical location, such as real estate data, weather information, demographics, etc. The weather service, a part of the application, may define only the interface for retrieving the weather information (more on this example shortly).

A service provider interface (SPI) is the set of public interfaces and abstract classes that a service defines. A SPI may be represented by a single interface (type) or abstract class or a set of interfaces or abstract classes that define the service contract.


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