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WEB SERVICESAN EVALUATION OF MODERN WEB SERVICE ARCHITECTURESGordon HewCOMS E6125 Web Information Management Systems
Agenda
Introduction Architectural Styles
Remote Procedure Call (RPC) Serviced Oriented Architecture (SOA) Representational State Transfer (REST)
Conclusion
Web Services & Architectural Styles What are Web Services? Why are they important? What are some examples? Why are Architectural Styles important? What criteria will be using to evaluate
these styles?
Remote Procedure Call (RPC) RPC
Client invocation of a local representation of a remote method
Remote Procedure Call (RPC) Example Technologies
XML-RPC RPC Style SOAP
Advantages Simple
Disadvantages Tightly Coupled Not Easily Scalable
Service Oriented Architecture (SOA) SOA Principles
Separation of concerns Service Orientation
Loosely Coupled Formal Contracts Abstract Logic Composable Reusable Autonomous Stateless Discoverable
Service Oriented Architecture (SOA) SOA Workflow
Service Oriented Architecture (SOA) Primary Technologies
Document-centric SOAP WSDL UDDI
Advantages Extensible Scalable
Disadvantages Excessive Configuration Reliance on Tools
Representational State Transfer (REST) REST Principles
Resource Oriented Uniquely Addressable Client-Server Stateless Cache Uniform Interface Layered System
Representational State Transfer (REST) REST Workflow
Representational State Transfer (REST) Example Framework
Restlet Advantages
Extensible Scalable Content Types
Disadvantages Data Size
Conclusion
REST is the best overall architecture style Not too complex Extensible Interoperable Scalable
Challenges to Adoption Benefits are not immediately recognizable Maturity Investment in SOA
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Felding, Roy T. Architectural Styles and the Design of Network-Based Software Architectures. Diss. Univ. of California, Irvine, 2000. 2 Feb 2008 <http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm>.
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<http://steve.vinoski.net/pdf/IEEE-Demystifying_RESTful_Data_Coupling.pdf>. Vinoski, Steve. "REST Eye for the SOA Guy." IEEE Internet Computing 11 (2007): 82-84. 10 Mar. 2008
<http://dsonline.computer.org/portal/site/dsonline/menuitem.9ed3d9924aeb0dcd82ccc6716bbe36ec/index.jsp?&pName=dso_level1&path=dsonline/2007/01&file=w1tow.xml&xsl=article.xsl&>.
Leventhal, Michael, and Zhang Sen. "True XML Web Services." XML Europe 2003 (2003). 13 Mar. 2008 <http://www.textscience.com/papers/04-04-03.html>.