What is WS in SOA?

 WS in SOA

ü WS stands for Web services.

ü The term "Web Service" can be described as a way of communicating with web based application using the open standards such as XML, SOAP, WSDL and UDDI.

ü Web Services are used to convert the existing application into the web based application.

Web Services are associated with following two classifications:

★ Temporary classification

★ Permanent Classification

Temporary classification(Service Role):

 ü Temporary classification is known as Service Role.

 ü Service Role is based on the roles it assumes during the runtime processing of a message.

ü A Web Service is capable of assuming different roles, depending on the context used.

Different Service Roles are,

★ Service Provider

★ Service Requestor

★ Intermediaries

★ Initial Sender and Ultimate Receiver

★ Service Composition

Permanent Classification(Service Models):

 ü Permanent Classification is known as Service Models.

 ü Service Model is based on the application logic it provides and the roles it assumes within a solution environment.

Types Of Service Models:

★ Business Service Model

★ Utility Service Model

★ Controller Service Model

Components Of Web Services:

Ø XML-RPC

Ø SOAP(Simple Object Access Protocol)

Ø WSDL(Web Service Definition Language)

Ø UDDI(Universal Description, Discovery and Integration)

Ø RDF(Resource Description Framework)

Ø RSS(Really Simple Syndication)

Features Of Web Services:

Ø WS are application Components.

Ø WS are self-contained and self-describing.

Ø WS communicate using open protocols.

Ø WS can be discovered using UDDI.

Ø WS can be used by other applications.

Characteristics Of Web Services:

Ø WS is XML based 

Ø It is loosely coupled

Ø Ability to be Synchronous or Asynchronous

Ø Supports Remote Procedure Calls

Ø Support Document Exchange

 

NOTE: This post does not contain the full explanation of WS, this post is for the last minute preparation of the exam.