基于改进的P2P网络的Web服务发现机制研究

Web Service Discovery Mechanism Based on Improved P2P Network

针对集中式Web服务发现机制的单点故障、性能瓶颈、服务失效等问题，分析了Web服务和P2P计算环境本身具有的相似之处和共同特征，提出了一种基于改进的P2P网络环境下的web服务发现机制。该机制利用分层思想，将整个P2P网络分为领域环、服务环及地域环三层的Chord结构，并在地域社区内建立节点智能选择的机制，使之能够达到优化网络结构、提高Web服务发现效率的目的。在Openchord平台上的仿真实验结果表明，该机制能够有效地解决集中式web服务发现机制在面向服务计算过程中的瓶颈问题。

The centralized Web services discovery mechanism has some problems such as single point of failure, performance bot- tleneck, service invalidation and so on. This paper analyzes the similarity and the common features between Web services and P2P computing environment itself, and presents a Web service discovery mechanism based on improved P2P network. Because of this mechanism utilizing layering thought, the whole P2P network is divided into three-layer chord structure which consists of field ring, service ring and regional ring. And intelligent selection mechanism of nodes is established in regional community to optimize network structure and improve service discovery efficiency. The experimental results in Openchord platform show that this mechanism can effectively deal with the problem of the centralized mechanism for Web service discovery during the Server Oriented Computing.