信息技术 开放分布式处理 对计算交互用的协议支持

[中文适用范围]： 此建议|国际标准基于开放分布式处理参考模型（ITU-T Rec. X.902 | ISO/IEC 10746-2 和 ITU-T Rec. X.903 | ISO/IEC 10746）中开发的抽象和概念框架-3）。 此建议|国际标准定义了系统的计算规范中的计算对象之间的交互如何与该系统的工程规范中的那些交互的协议支持相关。 特别是它： ——定义了通用互通框架（GIF）； ——在GIF中，定义了一组设施，每个设施都包含一组功能相关的服务原语，作为基本工程对象和通道对象交互的抽象定义； ——定义GIF的服务原语的参数； ——通过状态表定义允许的服务原语序列； ——在附件中规定了 GIF 服务原语及其参数到特定协议的消息和字段的映射。 如本建议书所述|国际标准 GIF 定义了对 ITU-T Rec. 中定义的可能计算交互的实用子集的协议支持。 X.903 | ISO/IEC 10746-3。 它还受到协议支持和支持的透明度功能的限制。 此处指定的 GIF 定义： ——支持计算操作，但不支持流； ——支持分层使用存根、绑定器和协议对象，使得支持协议对象的互通参考点处的任何交互都支持这些对象之一或基本工程对象的联络，并且支持这些联络的任何交互都通过该对象传递互通参考点； ——从一侧的角度来看，在单个互通参考点处的交互；没有明确考虑拦截器；注 1 - GIF 的目的是可以在未来的修订中进行扩展，以支持流和流。 本说明书仅限于技术上稳定的领域。 GIF 至少支持某些形式： ——访问透明度； ——位置透明度。 此处指定的 GIF 还支持有限的重定位透明度。 本说明书中没有提及其他透明体。 注 2 - GIF 的目的是可以在未来的修订中进行扩展，以支持更多的透明度。 GIF 没有明确对服务质量要求进行建模。 安全相关问题在 GIF 中的应用未包含在当前文本中，有待进一步研究。 本建议书附件中指定的到特定协议的映射集 |国际标准并不详尽。 GIF 可以映射到其他协议。 注 3 – 特别是，到 DCOM 协议族的映射将成为附加附件的候选。 [外文原描述]： This Recommendation | International Standard is based on the framework of abstractions and concepts developed in the Reference Model for Open Distributed Processing (ITU-T Rec. X.902 | ISO/IEC 10746-2 and ITU-T Rec. X.903 | ISO/IEC 10746-3). This Recommendation | International Standard defines how interactions between computational objects in a computational specification of a system relate to protocol support for those interactions in an engineering specification of that system. In particular it: ? defines a General Interworking Framework (GIF); ? within the GIF, defines a set of facilities each comprising a set of functionally-related service primitives as abstract definitions of the interactions of basic engineering objects and channel objects; ? defines the parameters of the service primitives of the GIF; ? defines the permitted sequence of the service primitives by means of state tables; ? specifies, in annexes, the mapping of the GIF service primitives and their parameters to the messages and fields of particular protocols. As specified in this Recommendation | International Standard, the GIF defines protocol support for a pragmatic subset of the possible computational interactions defined in ITU-T Rec. X.903 | ISO/IEC 10746-3. It is also restricted in the features of the protocol support and the supported transparencies. The GIF, as specified here, defines: ? support for computational operations, but not for streams; ? support using stub, binder and protocol objects hierarchically, such that any interaction at the interworking reference point of the supporting protocol object supports liaisons of one of those objects or of the basic engineering object, and any interaction to support those liaisons is passed via that interworking reference point; and ? interactions at a single interworking reference point, from the perspective of one side; interceptors are not explicitly considered; NOTE 1 ? It is intended that the GIF could be extended, in a future amendment, to support streams and flows. The present specification is restricted to areas that are technically stable. The GIF supports at least some forms of: ? access transparency; and ? location transparency. The GIF as specified here also supports a limited equivalent of relocation transparency. Other transparencies are not addressed in this present specification. NOTE 2 ? It is intended that the GIF could be extended, in future amendments, to support additional transparencies. The GIF does not explicitly model Quality of Service requirements. The application of security-related issues to the GIF are not included in the current text and are for further study. The set of mappings to particular protocols specified in annexes to this Recommendation | International Standard is not exhaustive. The GIF could be mapped to other protocols. NOTE 3 ? In particular, a mapping to the DCOM protocol family would be a candidate for an additional annex.