[综述阅读] A survey on Web Services composition

1．介绍

Web服务是一种用URL标识的软件系统， 它的接口界面和绑定由XML定义和描述。

2.   1)    服务组合三要素:

composition model & language;

development environment;

run-time environment.

2)    a)  an orchestration model:

Use process-modelling languages: UML activity diagrams, Petri-nets, state-charts, rule-based orchestration, activity hierarchies, pi-calculus.

b)      data & data access model:

c)      service selection model:

d)      transactions:

3)      BPEL4WS

3.      一个案例研究

4.      服务组合的6个热点问题: Coordination, Transcation , Context, Conversation modeling, Execution monitoring, Infrastructure.

相关经典论文： Ran, “A model for web services discovery with QoS”, 2003.

                 Wang, “Peer-serv: A Framework of Web Service in Peer-to-Peer

                 Environment”, 2003.

5.      Composition approaches (本文核心部分)

5.1

Static: (MS) Biztalk, (BEA) WebLogic;

Dynamic:  (HP) e-flow, StarWSCoP;

            比较：Web Services composition (vs) Business process management:

n      WS是自动的、异构的单元，它们的实现更加困难。

      5.2 Model driven service composition

      5.3 Declarative service composition

      5.4 Automated vs. manual WS composition

      5.5 Context based WS discovery & composition

6.   概括
 

7.      总结

现存的平台缺乏语义描述，因此可以接着在语义Web服务领域进行研究，除非Web服务组合不需要语义服务描述。