Evaluating Web Service Evaluating Web Service Composition Methods Composition Methods

with the help of a with the help of a Business ApplicationBusiness Application

By: Anand Ratnakar ShikhareSubmitted to: Professor Dr. Eduard Heindl

AgendaAgenda

IntroductionTerminologiesWeb Service ArchitectureDifferent Methods of Web Service

CompositionCriteria for EvaluationBusiness ApplicationsConclusion

TerminologiesTerminologies

Web Service: Definition, Basic, CompositeWSDL(Web Service Definition Language as an

interface)HTTP(Definition, Port)SMTP(Definition, Port)SOAP(Encoded in XML)UDDI(specification for publishiing)

Web Service ArchitectureWeb Service Architecture

Methods of Web Service Methods of Web Service CompositionComposition

1.Workflow Based Composition:

a)Static Composition: User creates an abstract model. Example: E-Flow Method(Composite services modelled as

business processes) b)Dynamic Composition

Methods of Web Service Methods of Web Service CompositionComposition

c)Combination of Static and Dynamic Composition

Example: Polymorphic Process Model(sub-processes

are abstract-functionality described but not which processes-decided at runtime)

Methods of Web Service Methods of Web Service CompositionComposition

2.XML-Based Composition: Required when arrangement is not heirarchical, XML

meta-data is required to describe functionality of sub-processes.

a)Web Service Orchestrationb)Web Service Choreographyc)BPEL4WS(Enables Business Transactions along with Interaction between services-Ex. Money Transfer )

Criteria For EvaluationCriteria For Evaluation

ConnectivityException Handling (Atomicity of Transactions)ScalabilityCorrectnessQoS (Security, Value for money, Execution cost &

efficiency, Reputation)

Examples of Business ApplicationsExamples of Business Applications

Examples of Business ApplicationsExamples of Business Applications

Evaluation of Composition Evaluation of Composition Methods – Online BookstoreMethods – Online Bookstore

ConclusionConclusion

Complexity of Composition increases with Complexity of Business Applications

Analysis before implementing and Testing afterwards.

Web Services have become an indispensable part of our lives.

Questions?Questions?

Thank You!Thank You!