understand SCA
Service Component Architecture, or SCA, is a technology for creat ing services and assembling them into composite applications. SC addresses the perennial question of how to build systems from a series of interconnected parts. In SCA, these parts interact by pro- viding services that perform a specific function. Services may be implemented using different technologies and programming lan- guages. For example, a service can be implemented in Java, C++, or in a specialized language such as Business Process Execution Language (BPEL). Services may also be collocated in the same op- erating system process or distributed across multiple processes running on different machines. SCA provides a framework for building these services, describing how they communicate and
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