基于Traits泛化技术的SLE API编译码处理

在对CCSDS(Consultative Committee for Space Data Systems,空间数据咨询委员会)制定的SLE(Space Link Extension,空间链路扩展)的标准API(Application Program Interface,应用程序接口)设计开发过程中,需要对各种不同服务类型的操作进行ASN.1(Abstract Syntax Notation One,抽象语法标记1)编码译码,使用一般方法处理会存在大量的冗余且可扩展性不强。因此,设计了基于Traits技术的SLE API编码译码泛化模型,该模型从服务、协议数据单元、操作等3个层级,以及编码、译码这2个方向分别定义模板,并进行特化、偏特化以及萃取,从而实现了对编码、译码过程的泛化,并通过实例描述了应用过程。该模型有效提高了SLE API设计的灵活性、层次性、通用性,以及SLE服务的可拓展性。

Processing of SLE API Encoding and Decoding by Using Traits Generalization

During design and development of CCSDS (Consultative Committee for Space Data Systems) SLE (Space Link Extension) standard API (Application Program Interface),all operations of different services need to been encoded and decoded by using ASN.1.There are a lot of redundant processing and scalability is very weak in the processing by using general methods.Based on traits,an SLE API encoding and decoding generalized model is designed.From three levels,service,protocol data unit and operation,and from both directions of encoding and decoding,templates are defined,and specialization and partial specialization traits are processed.Encoding and decoding are generalized.The application processes are described by examples.The model effectively enhances the flexibility,hierarchy and versatility of SLE API design and extensibility of SLE services.