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service locator pattern
The service locator pattern is a design pattern used in software development to encapsulate the processes involved in obtaining a service with a strong abstraction layer. This pattern uses a central registry known as the "service locator", which on request returns the information necessary to perform a certain task.〔http://martinfowler.com/articles/injection.html#UsingAServiceLocator〕
==Advantages==
* The "service locator" can act as a simple run-time linker. This allows code to be added at run-time without re-compiling the application, and in some cases without having to even restart it.
* Applications can optimize themselves at run-time by selectively adding and removing items from the service locator. For example, an application can detect that it has a better library for reading JPG images available than the default one, and alter the registry accordingly.
* Large sections of a library or application can be completely separated. The only link between them becomes the registry.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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