CS-802 Act-1.ppt

CS-802 Act-1.ppt

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  Program : B.Tech,CSE,VIII Semester, IV Year CS-802 (B):Cloud Computing Topic: Web services Jan-June, 2023 Activity-I Submitted to:- Submitted by:- Asst. Prof. Roll no.:- Department of CSE
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  Outlines • Introduction • Architecture •Working • Types • Advantages • Disadvantages
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  Web Services • Onthe World Wide Web, a web service is a standardized method for propagating messages between client and server applications. • A web service is a software module that is intended to carry out a specific set of functions. • The web service would be able to deliver functionality to the client that invoked the web service. • Web Services can convert your application into a Web- application which can publish its function or message to the rest of the world.
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  Architecture
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  • Service Provider- From an architectural perspective, it is the platform that hosts the services. • Service Requestor - Service requestor is the application that is looking for and invoking or initiating an interaction with a service. The browser plays the requester role, driven by a consumer or a program without a user interface. • Service Registry - Service requestors find service and obtain binding information for services during development. CS-802
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  Working
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  • Web-Service functionsas a request-response pattern that empowers communication among different applications. • An element will request some support of its partner to be a specific specialist service provider. Upon demand, the specialist co-op will react with a reaction message. So, there are two messages included one Request message (XML)and one Response message (XML). • An administration utilizes XML to label information, SOAP to move a message lastly, WSDL to depict the accessibility of administrations. CS-802 7
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  Types • SOAP:- • SOAPstands for Simple Object Access Protocol. • It is a XML-based protocol for accessing web services. • It also defines the way of building web services. • SOAP is platform independent and language independent. • By using SOAP, you will be able to interact with other programming language applications. CS-802 8
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  • REST:- • RESTstands for REpresentational State Transfer. • The main goal of RESTful web services is to make web services more effective. • RESTful web services define services using the different concepts that are already present in HTTP. • REST is an architectural approach, not a protocol. CS-802 9
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  Advantages • Business Functionscan be exposed over the Internet • Interoperability • Communication with Low Cost • A Standard Protocol that Everyone Understands • Reusability
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  Disadvantages • No callbackmechanism • No transactions across the Web • Availability - every user or client who uses web services knows that it is not available hundred percent all the time. • Security - web services are available to public through http-based protocol. So every one can access web services and use it. This flaw can be avoided using authentication mechanisms.