CIS-764 Database Design Service-Oriented Architecture and Web-Services Binti Sepaha.
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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 (contd.) Discovery through dynamic discovery (UDDI) Description through WSDL Packaging through SOAP (XML) Transport through HTTP Network through Internet or local intranet (TCP/IP)