标签：void 方法 软件 fine signed aspect asi within standard
zh.wikipedia.org/wiki/面向服务的架构
【程序功能做为服务】
面向服务的体系结构（英语：service-oriented architecture）是构造分布式計算的应用程序的方法。它将应用程序功能作为服务发送给最终用户或者其他服务。
en.wikipedia.org/wiki/Service-oriented_architecture
【不强调模块 分布式】
Different services can be used in conjunction to provide the functionality of a large software application.[4] So far, the definition could be a definition of modular programming in the 1970s. Service-oriented architecture is less about how to modularize an application, and more about how to compose an application by integration of distributed, separately-maintained and deployed software components. It is enabled by technologies and standards that make it easier for components to communicate and cooperate over a network, especially an IP network.
Services adhere to a standard communications agreements, as defined collectively by one or more service-description documents within a given set of services.Service reference autonomy (an aspect of loose coupling)The relationship between services is minimized to the level that they are only aware of their existence.Service location transparency (an aspect of loose coupling)Services can be called from anywhere within the network that it is located no matter where it is present.Service longevityServices should be designed to be long lived. Where possible services should avoid forcing consumers to change if they do not require new features, if you call a service today you should be able to call the same service tomorrow.
The services act as black boxes, that is their inner logic is hidden from the consumers.
Services are independent and control the functionality they encapsulate, from a Design-time and a run-time perspective.
Services are stateless, that is either return the requested value or give an exception hence minimizing resource use.
A principle to ensure services have an adequate size and scope. The functionality provided by the service to the user must be relevant.Service normalizationServices are decomposed or consolidated (normalized) to minimize redundancy. In some, this may not be done, These are the cases where performance optimization, access, and aggregation are required.[15]
Services can be used to compose other services.
Services are supplemented with communicative meta data by which they can be effectively discovered and interpreted.
Logic is divided into various services, to promote reuse of code.
Service encapsulation
Many services which were not initially planned under SOA, may get encapsulated or become a part of SOA.
service oriented architecture 构造分布式计算的应用程序的方法
标签：void 方法 软件 fine signed aspect asi within standard
原文地址：http://www.cnblogs.com/yuanjiangw/p/7745482.html
