Transcript Binti Sepaha - SOA and Web

CIS-764
Database Design
Service-Oriented Architecture
and Web-Services
Binti Sepaha
Overview
 Introduction
 Definitions/Concepts
 Steps in Building a Web-Service
 Web-Service by Example
 Benefits of Web-Services
 Conclusion
 References
Introduction
History of Software Development
 Modular Approach
Code reuse - sub-routines and functions
Maintenance became a problem

Object-Oriented Programming
Reuse code but not functionality

Component-based Software Development
Reuse functionality
components were written in different languages
Changes became tough, redistribution was tough
Service-Oriented Architecture & Web-Services
 Greater Reuse
 Web Interface
 Loose Coupling enables business flexibility
 Use the best service provided by service providers based on the
consumer’s criteria
 Platform-independence
 Integration of several services
 Application Integration became easier
Definitions/Concepts
 Service
A service is a function that is well-defined, self-contained, and
does not depend on the context or state of other services.
Services are long running executables.
 Web-Service
A Web-Service is a piece of software that makes itself available
over the Internet and uses a standardized XML messaging
system.
 Service Provider
A company that provides a service by exposing it through a
dynamic discovery service.
Definitions/Concepts (contd.)
 Service Consumer
A program that consumes or subscribes to a service provided by
a service provider.
 Dynamic Discovery
An intermediary between providers and consumers.
Universal Description, Discovery and Integration (UDDI) is a
directory service where businesses can register and search for
Web services.
 Message
Communication means between service providers and
consumers.
Definitions/Concepts (contd.)
 WSDL (Web-Services Description Language)
WSDL provides a way for service providers to describe the basic
format of web service requests over different protocols. WSDL is
used to describe ‘what’ a web service can do, ‘where’ it resides,
and ‘how’ to invoke it.
 SOAP (Simple Object Access Protocol)
SOAP is a protocol specification that defines a uniform way of
passing XML-encoded data. In also defines a way to perform
remote procedure calls (RPCs) using HTTP as the underlying
communication protocol. SOAP essentially provides the envelope
for sending the Web Services messages.
Steps in Building a Web-Service
Steps in Building a Web-Service (contd.)
 Discovery
through dynamic discovery (UDDI)
 Description
through WSDL
 Packaging
through SOAP (XML)
 Transport
through HTTP
 Network
through Internet or local intranet (TCP/IP)
Web-Service by Example
Benefits of Web-Services
 More reuse
 Better Scalability
 Service Assembly
 Higher Availability
 Code Mobility (location transparency)
 And many more…
Conclusion
Developers must switch to Service-Oriented
Architecture
References
 www.ondotnet.com
 www.service-architecture.com
 www.msdn.com
 www.webservices.xml.com
 www.capeclear.com
 www.developer.com