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SOALIB
Service-oriented architecture library (SOALIB) is used to distribute reusable service-oriented architecture (SOA) software〔Microsoft Corporation, January 2004. () Understanding Service-Oriented Architecture, The Architectural Journal〕〔Sun Microsystems, April 2005. () Service-Oriented Architecture (SOA) and Web Services: The Road to Enterprise Application Integration (EAI)〕 in a manner similar to other computing libraries. SOA consists of loosely coupled interoperable services which use messaging based on both Simple Object Access Protocol (SOAP) and Representational State Transfer (REST). A library in computing is a set of compiled modules which are tested and ready for reuse. A similar concept is used for SOA, in that whatever technology is used to develop the service can also be distributed in library form. A Java-based SOA library may be distributed in Web ARchive (WAR) or Enterprise Archive (EAR) file formats. C, C++, and .NET applications may be distributed as a shared object (in Unix and Linux), a Dynamic Link Library (in Windows), or as an executable file.
==History==
Service-oriented architecture is usually tied to the redesign of an entire software system and determines how to decompose the single software unit into loosely coupled components, in which each loosely coupled component acts as an interoperable service. Such a task is enormous and may take a significant amount of time, while on the atomic level (where ''atom'' is defined as a single loosely coupled service that is self-contained), most services are reusable regardless of the application. As an example, all matter is built with atoms, yet all material things are different. At the atomic level, however, they appear uniform. Similarly, all software can be built on loosely coupled services which serve as the "atoms" of the redesign process. Because loose coupling is difficult to determine, the opposite is not true. That means it is easier to build a complete software system by using available loosely coupled services.
By building service-oriented architecture libraries, each of which is a loosely coupled service, complex applications can be developed by making use of these services. Because new applications depend on all loosely coupled services, as long as one sticks to loose coupling, the final application is also loosely coupled. While it is true that the final application depends on many hierarchical loosely coupled systems, it remains loosely coupled because all the hierarchy is based on atomic services.
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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