论文标题:基于soap异构分布式对象互操作模型设计与实现
Designed and Implemented on the Interoperability Model of the Heterogeneous Distributed Object Based on SOAP
论文作者 许勇
论文导师 吕光宏,论文学位 硕士,论文专业 计算机应用技术
论文单位 四川大学,点击次数 91,论文页数 69页File Size596k
2004-04-28论文网 http://www.lw23.com/lunwen_114410692/ XML,SOAP,远程过程调用,CORBA
XML,SOAP,RPC calls,CORBA
分布式对象系统的应用范围已经扩展到Internet之上,企业之间现有的软件构件需要实现相互通信。DCOM和CORBA是两种最常用的分布式对象系统,它们在局域网内工作良好,当扩展到Internet时,会出现防火墙不友好、过分依赖环境等缺陷。同时由于两种不同系统的接口标记,网络数据表示格式等都不相同,所以这两种系统相互之间很难实现互操作,而互操作的核心问题就是如何传递远程过程调用消息。XML和SOAP技术的产生和发展使Internet上分布式对象之间的互操作成为可能。XML是一种标记语言,可以通过定义标记达到数据的标准化、结构化表示。SOAP以XML语言的形式提供了一个简单、轻量的用于在分散或分布环境中交换结构化和类型化信息的机制。SOAP消息与HTTP协议绑定后,可以成为Internet上分布式对象之间的远程过程调用协议,从而达到不同系统之间互操作的目标。本文首先详细描述了如何用XML语言描述分布式对象的接口以及如何将对象发出的远程过程调用请求和请求应答消息转换为SOAP消息格式,并给出了SOAP消息与HTTP协议绑定后HTTP包的具体格式。接着,本文设计了一个基于SOAP的分布式对象互操作模型,互操作模型采用SOAP作为传输协议,XML作为数据表示格式,有效解决了现存的两种分布是对象系统之间的不兼容。互操作模型的功能主要是传递对象发出的远程过程调用消息。本文从传统分布式对象系统间远程过程调用流程入手,分析了当请求调用消息以SOAP消息格式在Internet上传输时,互操作模型应该考虑的问题。本文详细描述了互操作模型的体系结构、工作原理和工作流程。最后,运用该新型的互操作设计模型,构件了一个基于Internet的银行帐户管理系统应用实例,将设计模型与实际应用进行了有机的结合。
With the development of Internet technology, the existing software components in the enterprises should be communicated with each other via Internet. DCOM(Distributed Component Object Model) and CORBA(Common Object Request Broker Architecture) are two popular distributed object models. They work well in Intranet respectively, but when extended to Internet, there will be some problems such as firewall unfriendly, more dependence on environment and so on. There are the difference of the interface identifier and the network data representation format between DCOM and CORBA so that they can hardly inter-opreate with each other. And the main problem of interoperability is how to transfer the RPC(Remote Procedure Call) calls.With the emergence of XML(Extensible Markup Language) and SOAP(Simple Object Access Protocol) technology, it is possible to implement the interoperability of distributed objects. XML is a markup language and can define to standardize and structurize on the data representation. On the other hand, SOAP is a lightweight protocol for exchange of information in a distributed environment and it is an XML-based protocol. We can encapsulate and exchange RPC calls via Internet by binding SOAP and HTTP(Hypertext Transfer Protocol).In this thesis, it is described representation of the interface of distributed objects, conversion of RPC calls to SOAP message, and the format of binding SOAP and HTTP. Then, a SOAP-based interoperable system that can transfer RPC calls of distributed objects is given. The system uses SOAP as transfer protocol and XML as data representation format. The main function of the system is to transfer RPC calls of distributed objects. The architecture, principle and working mode of the system is introduced in detail. Finally, based on the above-mentioned model, an implementation of an Internet-based bank account-managed system is shown. It is proved that the model system is very good.
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