web services introduction to webintroduction to web ...sirisuda/290371/290371_ch04.pdfdescribes the...

Introduction to WebIntroduction to Web Services and SOAServices and SOA

Chapter 4

Chapter 04 Intro WS 1

OutlineWeb Services

Web TechnologyWhat is Web ServicesWhy Web ServicesWeb Services Architecture and standardWeb Services Architecture and standard

Services Oriented Architecture (SOA)What are Services?What are Services?SOA DevelopmentSOA and Web Service Integration

Case study


Web Technology

Static Web PageDynamic Web PageWeb services


Traditional Web Interaction

User

Web Application

HTML

Web ApplicationWeb


Web Services Interaction

Application

Web Services

XML

Web ServicesWeb


Web Application vs. Web Services

Web Application Web ServicesHTMLUser-to-program

XMLProgram-to-program p g

interactionStatic integration of

g p ginteractionDynamic integration ofStatic integration of

componentsMonolithic service

Dynamic integration of componentsService aggregationMonolithic service Service aggregation


Distributed Computing Technologies


Internet Evolution


What is Web Services

"A Web service is a software system designed to i bl hi hi i isupport interoperable machine-to-machine interaction

over a network. It has an interface described in a hi bl f ( ifi ll WSDL)machine-process able format (specifically WSDL).

Other systems interact with the Web service in a ib d b i d i i i SOAPmanner prescribed by its description using SOAP-

messages, typically conveyed using HTTP with an XML i li i i j i i h h W bXML serialization in conjunction with other Web-related standards."


Characteristics of Web Services

XML based everywhereM b dMessage-basedProgramming language independentCould be dynamically locatedCould be dynamically assembled or aggregatedAccessed over the internetLoosely coupledLoosely coupledBased on industry standards


Web Services มาจาก

Web and Services SOA = Service –oriented Architecture

WWW SOA

Web Services Architecture


Why Web Services ? 1/3

Platform neutralAccessible in a standard wayAccessible in an interoperable wayAccessible in an interoperable wayUse simple and ubiquitous toolsRelatively cheapSi lif t i i t tiSimplify enterprise integration



Interoperable – Connect across heterogeneous networks using ubiquitous web-based standardsEconomical – Recycle components, no installation and tight integration of softwareinstallation and tight integration of softwareAutomatic – No human intervention required even for highly complex transactions



Accessible – Legacy assets & internal applications are exposed and accessible on the WebAvailable – Services on any device, anywhere and anytimeanywhere, and anytimeScalable – No limits on scope of applications and amount of heterogeneous applications


Web services platform elements

SOAP (Simple Object Access Protocol) UDDI (Universal Description, Discovery and Integration)Integration) WSDL (Web Services Description Language)


Web Service Architecture






Operation Models for Web Services 1/3

Web Service ProviderCreates the Web service typically as SOAP-based service interfacesCreates the Web service typically as SOAP-based service interfacesDeploys the service and makes them available for invocation over a networkDescribes the Web service as a WSDL based service descriptionRegisters the WSDL-based service description with a service broker, which is typically a UDDI registrywhich is typically a UDDI registry



RegistryStores the service description as binding templates and URLs to WSDL located in the service provider penvironmentList various service types, descriptions, andList various service types, descriptions, and locations of the services that help the service requesters find and subscribe to the requiredrequesters find and subscribe to the required services



Service ClientsLocates the required services by querying the UDDILocates the required services by querying the UDDI registryObtains the binding information and the URLs to identifyObtains the binding information and the URLs to identify the service providerInvokes the service providerpRetrieves the WSDL Service description for those registered servicesgCommunicate with the service providerExchange data or message by invoking the available


g g y gservices in the service container

Web Services Protocol Stack (4 Layers)


Web Services Protocol Stack (4 Layers)

Service TransportThi l i ibl f t ti b tThis layer is responsible for transporting messages between applications. Currently, this layer includes hypertext transfer protocol (HTTP), Simple Mail Transfer Protocol p ( ), p(SMTP), file transfer protocol (FTP)

XML MessagingThis layer is responsible for encoding messages in a common XML format so that messages can be understood at either end Currently this layer includes XML RPC andat either end. Currently, this layer includes XML-RPC and SOAP.


Web Services Protocol Stack (4Web Services Protocol Stack (4 Layers)y )

Service DescriptionThi l i ibl f d ibi th bli i t fThis layer is responsible for describing the public interface to a specific web service. Currently, service description is handled via the Web Service Description Language p g g(WSDL).

Service Discovery�This layer is responsible for centralizing services into a common registry, and providing easy publish/find functionality Currently service discovery is handled viafunctionality. Currently, service discovery is handled via Universal Description, Discovery, and Integration (UDDI).


SOAPSimple Object Access Protocol (SOAP)SOAP is based on XMLSOAP is based on XMLSOAP is platform independentindependentSOAP is language independentSOAP is simple and extensibleSOAP ll t tSOAP allows you to get around firewallsSOAP will be developed as


SOAP will be developed as a W3C standard

WSDL

Web Service Description Language (WSDL)WSDL is an XML grammar for specifying a public interfaceWSDL is an XML grammar for specifying a public interface for a web service.Information on all publicly available functions.p yData type information for all XML message.Biding information about the specific transport protocol to be g p p pused.Address information for locating the specified service.Describing of SOAP Services


Web Service Implementation

Service Provider


Web Service Implementation

Service Requestor


Open Source Web Services DevelopmentOpen Source Web Services Development Tools

Apache Axis http://ws.apache.org/axis

PHP NuSOAPPHP NuSOAP http://dietrich.ganx4.com/nusoap/index.php

SUN J2EE: Java Technology and WebServicesWebServices

http://java.sun.com/webservices/index.jsp


Commercial Web Services DevelopmentCommercial Web Services Development Tools

BEA WebLogic Web Service http://dev2dev.bea.com//webservices

Cape Clear http://www.capeclear.com/

IBM WebShpere SoftwareIBM WebShpere Software http://www-306.ibm.com/software/websphere/

MS .NETMS .NET http://msdn.microsoft.com/webservices/

Systinet http://www.systinet.com/

webMethodshttp://www webmethods com


http://www.webmethods.com

Web Servers

Microsoft IISS A li i SSun Application ServerApacheJarkata TomcatOracleSystinet Web ServerJBossJBossBEA Weblogic Server


SSummaryWeb services technology exists for making different systems seamlessly work together

XML is the language of exchange dataWeb service standards are open standardsp

Web services have been developed and used extensively in many countriesextensively in many countriesThailand should develop and employ Web services technology more for the benefits of more effectivetechnology more for the benefits of more effective management and business profits


ทมาของ SOA / Web Services

The business drivers for a new approachความตองการทางดานธรกจเปนตวขบเคลอนใหเกดการพฒนาซอฟตแวรในรบแบบใหม คอ Service-Oriented Architecture ภายใตเงอนไขดงน

ลดตนทนการพฒนาโดยใชเทคโนโลยทมอยเดมใหมากทสดตองมการพฒนาระบบอยางตอเนองเพอตอบสนองลกคาเพมความสามารถการแขงขน และรองรบเงอนไขตางๆทางธรกจ


ทมาของ SOA / Web Servicesความหลากหลายของระบบ (Heterogeneity)

ระบบซอฟตแวรในระดบ Enterprise ตวอยางเชน ระบบงานของหนวยภาครฐ p ฐซงประกอบไปดวย ซอฟตแวรทหลากหลาย และแตกตางกน ทงในสวนเทคโนโลย ผผลต การทางาน และอายการใชงาน

การรวมระบบทมความแตกตางกน เปนเรองททาไดยากและเปรยบเหมอนฝนรายของนกพฒนาระบบไมสามารถทจะเปลยนแปลงซอฟตแวรทกตวใหมาจากผผลตเดยวกนได (Single-vendor approach)

เพราะซอฟตแวรทเหมาะสม และสนบสนนการทางานในทกเรอง เปนเรองทยากมาก


ทมาของ SOA / Web Services

การเปลยนแปลง (Change) เนองจากการแขงขนในโลกของธรกจ ทตองอาศยความเรว และการแขงขนสงลกคาเปลยน Requirement เนองจากตองการปรบขบวนการเพอกลยทธ q การปรบเปลยนคณลกษณะของซอฟตแวร เพอทนตอสถานการณ


What are Services?

Bank ServicesAccount management (opening and closing accounts).)Loans (application processing, inquiries about terms and conditions, accepting payments).terms and conditions, accepting payments).Withdrawals, deposits, and transfers.F i hForeign currency exchange.


What are Services?


Service Oriented Architecture (SOA)

A style of design that guides all aspects of creating and using Business Services throughout their lifecycleBusiness Services throughout their lifecycle.A way to define and provision an IT infrastructure to allow different applications to exchange data and participate in business processesOperating systems or programming languagesN li i b d l d i l l i lNew applications can be developed entirely, or almost entirely, by composing existing services.New applications can be assembled out of a collection ofNew applications can be assembled out of a collection of existing, reusable services.


SOA Benefits

ReuseThe ability to create services that are reusable in multiple applications.

Efficiency The ability to quickly and easily create new services and new applications using a combination of new and old services, along with the ability to focus on the data to be shared rather than the implementation underneathshared rather than the implementation underneath.


SOA Benefits

Loose technology couplingThe ability to model services independently of their execution environment and create messages that can be sent to any serviceto any service.

Division of responsibilityThe ability to more easily allow business people to concentrate on business issues, technical people to concentrate on technology issues and for both groups toconcentrate on technology issues, and for both groups to collaborate using the service contract.








Service Oriented Development


Service Oriented Development


SOA and Web Service Integration

Web services integration (WSI)The tactical and opportunistic application of Web services to solving integration and interoperability problems.

Service-oriented integration (SOI)Integration using Web services in the context of an SOA that is, the strategic and systematic application of Web services to solving integration and interoperability problemsproblems.


Point-to-Point Integration


Point-to-Point Integration


An Integration Architecture


Summary

SOA is a style of design that guides all aspects of creating and using business servicesof creating and using business services throughout their lifecycle. And promise of

ReuseReuseEfficiencyLoose technology couplingLoose technology couplingDivision of responsibility

Web Services is technology to help the conceptWeb Services is technology to help the concept of SOA.


Case Study


Phuket One Stop Services Portalp


Case Study : ประโยชนทหนวยงานไดรบ

เชงบรหารดานเทคนคการทางานรวมกนของซอฟตแวรและฐานขอมลทหลากหลาย

(heterogeneous)สามารถเกดการแลกเปลยนขอมลและบรการไดอยางอตโนมต เสมอนเปนซอฟตแวรตวเดยวกน (interoperability)yการสรางบรการขนมาใหม หรอการน าบรการเกามาประยกตใชสามารถท าไดโดยงาย และรวดเรว (Efficiency and Reuse)โดยงาย และรวดเรว (Efficiency and Reuse)ลดความผดพลาดจากคน (human error)


web services introduction to webintroduction to web ...sirisuda/290371/290371_ch04.pdfdescribes the...

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