Web Services based e-Commerce System Sandy Liu Jodrey School of Computer Science Acadia University July, 2002
Dec 31, 2015
Web Services based e-Commerce System
Sandy Liu
Jodrey School of Computer Science
Acadia University
July, 2002
Existing Problems
Most existing e-commerce systems have common problems in:
Flexibility Information Sharing IntegrationQuestion: How to build a highly flexible,
integratable and maintainable application?
Proposed Solution
A Web Services based e-commerce system: Flexible System Architecture Well-defined Software Components Multiple Information/Data Access Channels
A practical strategy to improve the overall efficiency of existing systems at a low cost.
What is Web Services
It is a platform and implementation independent software component that can be:
Described using a service description language
Published to a registry of services
Discovered through a standard mechanism at runtime or design time
Composed with other services Examples: credit card processing, shipment tracking…
What is Web Services
Application Code
Application Code
Application Client
Application Client
Web Services
Platform, Language & Location specific communication
Platform, Language & Location agnostic communication
• Web Services are intended to be used by other programs or applications, not by a human user.
• It acts as an abstraction layer, separating the platform and programming-language specific details from how the application code is invoked.
Service-Oriented Architecture
Service RegistryService Registry
Service Requestor
Service Requestor
ServiceProviderService
Provider
Find
Bind
Publish
Web Services Stack
Network
Transport
Packaging
Description
Publishing / Discovery UDDI/ebXML registries
WSDL/WSCL
SOAP/XML Protocol
HTTP/SMTP/FTP/Jabber
TCP/IP
Enabling Technologies and Standards
HTTP XML and XML Schema (XSD) SOAP (Simple Object Access Protocol) WSDL (Web Services Description
Language) UDDI (Universal Description, Discovery and
Integration)
HTTP
The most pervasive communication protocol used in the Internet world.
A feature of HTTP is the typing and negotiation of data representation, which allows systems to be built independent of the data being transferred.
XML & XML Schema (XSD)
XML Schema or XSD (XML Schema Definition) lays the mechanism for defining the vocabulary and structure of XML documents:
XSD is defined using an XML format XSD has a data typing mechanism
XSD uses namespace
SOAP
SOAP – Simple Object Access Protocol Industry’s best effort to date to standardize
on the infrastructure technology for cross-platform XML distributed computing
Use HTTP to transfer data (by default) Based on XML-RPC, everything is encoded
in XML format
WSDL
WSDL- Web Service Description Language Formally, it’s an XML format for describing network
services as a set of end points operating on messages containing either document-oriented or procedure-oriented information
Informally, it’s a document that provides the access information for the service consumer, such as the method signature (input/output parameters, and so forth); the protocol to be used (IIOP, SOAP, and so on); the network address (URL); and the data format (encoding schemes).
UDDI
Universal Description, Discovery and Integration a platform-independent, open framework for
describing services, discovering businesses, and integrating business services using the Internet
Enables businesses to describe their services and business processes and their preferred methods for conducting business.
Offers both a web-based user interface and a set of APIs for program access.
Web Services and e-Commerce
The magic glue for B2B integration Enterprise-wide application integration
The 3-tier Architecture
Enhydra Application: IBuildPC.com
1st/2nd
Tier Line1st/2nd
Tier Line2nd/3rd
Tier Line 2nd/3rd
Tier Line
Challenge
Putting the puzzles together: SOAP container Application Server Web Server Database Server
IBuildPC.com
IBuildPC.com
IBuildPC.com
Supplier 1
Supplier 1
Supplier 2Supplier 2
Supplier nSupplier n
Retailer A
Retailer A
Retailer B
Retailer B
Retailer n
Retailer n
Online ShoppersOnline Shoppers
IBuildPC.com
In the Service-Oriented-Architecture, it is a Service Provider towards its downstream
customers a Service Requestor towards its suppliers,
credit card verification service provider, SMTP service provider, etc.
The Client System
Used by a retailer of IBuildPC.com Built with Visual Basic Requests the web services provided by
IBuildPC.com (built with Java) Demo…
Conclusion
Modularized, portable, and highly integratable system
Great deployment flexibility Low entrance cost
But it is not a cure-all solution for everyone – yet to mature at its current state