Web Service for Interactive Application （ WSIA ）

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Web Service for Interactive Application （WSIA）

授課老師：葉慶隆教授報告學生： GI1-08蕭正凌報告日期： 2004/04/24

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Outline

Introduction What is WSIA? Why need WSIA? WSIA/WSRP Technology Overview. Conclusion Reference

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Introduction

HTML

presentation

Extent Transaction

DHTML

Java scriptVB script

User interactive

Server Page

JSPASP.NET

Human understanding

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Introduction

XML

Data/Message exchange

Presentation/interactiveSOAP

interoperability

?

Machine understanding / Cross platform

Web Service

WSDL

UDDI

Application-Application

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Introduction

Ed Anuff, chief strategy officer at Epicentric. ‘A web service up until now using SOAP and WSDL has had no presentational aspect to it. With component model Web Services you can provide a complete user interface for an end-user involved in that which can be dynamically plugged into a portal without development efforts’[October,2001]

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Introduction

Why little focus on UI in Web Service? Lack of perception of the UI as a distributed app

problem. Lack of focus on the need to support diversity of the

UI. It’s a messy problem

XHTML, WML lack semantics of data-oriented XML How to raise level of abstraction without introducing new and

hard-to-get-adopted markup languages.

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Introduction

Web service’s user interface may be created automatically?

How to deliver Web Services to end users?Directly to a browser or mobile device Indirectly through a portal Indirectly embedding into a 3rd party web

application.

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What is WSIA?

A New web services standard for Interactive application in Web Serviceenable organization can easily plug and play

web service into their applications and portals just a few mouse clicks and no programming effort.

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What is WSIA?

Internet, intranet Network

HTTP, HTTPR, SMTP, MQ Transport

SOAP / XML Protocol Message / Protocol

???Transactions / Reliability /

Routing

Security / P

rivacy

Quality of service

Managem

ent

WSDL Service Descriptions

WSFL Flow Descriptions

WSIA Web Applications

UDDI Publishing & discovery

TPA Service negotiation

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What is WSIA?

History January 21, 2002 the OASIS Rename Web

service Component Model ( WSCM) as WSIANovembre 2002 Working Draft 0.8 (with

WSRP)

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What is WSIA?

OASIS Current Technical Committees. Access Control (XACML) Business Transaction Protocol (BT

P) Common Biometric Format (XCBF) Conformance Customer Information (CIQ) Directory Services (DSML) DocBook ebXML CPPA ebXML IIC ebXML Messaging ebXML Registry Election Services Entity Resolution Human Markup

• Provisioning Services (PSML)

• Rights Language

• RELAX NG

• Security Services

• Topic Maps Published Subjects

• Topic Maps Published Subjects for Geography and Language

• Topic Maps Vocabulary for XML Standards

• Universal Business Language

• Web Services for Interactive Applications (WSIA)

• Web Services Remote Portal (WSRP)

• XSLT Conformance

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What is WSIA?

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What is WSIA?

The goals of the OASIS WSIA TC To create an XML and web services centric framework for

interactive web applications. To Harmonize WSIA with

existing web application The work of W3C Emerging web services standard Appropriate business information bodies

To ensure that WSIA application can be deployed on any tier of network and remain target device

Promote WSIA to the status of international standard for based Web application development.

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What is WSIA?

WSIA TC Members BEA Bowstreet Cisco Computer Associates CrossWeave Cyclone Commerce Divine USAF/Dept of Defense Epicentric France Telecom Fujitsu HP IBM Intel

KiNZAN Macromedia Nokia Peregrine Systems Plumtree Pointgain Corp SAP SeeBeyond Silverstream Sterling Commerce Vitria WebCollage

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JSP-168

What is WSIA?

WSUI

WSCM

WSXL

WSIA WSRP

XMLAPI

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What is WSIA?

WSRPWeb Service Remote PortalWSIA focus on the framework for creating

interactive Web services, and WSRP defines the interfaces to include portal-specific features.

WSIA is of broader scope than WSRP

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What is WSIA?

WSRP

SOAP(Invocation)

WSDL(Description)

UDDI(Publish,Find&Bind)

WSIAWSRP/WSIA

Common Base

(X)HTML WMLVoiceXML

cHTML ...

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What is WSIA?

WSXL

Web Service Experience Language

IBMWSUI

Web Service User Interface

Epicentric

WSIAWSRP

Web Service Interactive Applications (Web Service Remote Potal)

OASIS

WSRPIBM

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Why need WSIA?

retailer manufacture

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2

3

XML APIs don’t provide the simplicity needed to scale integration to thousands of channel partners

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intranet

Why need WSIA?

How to transition as many processes as possible into self-service tasks over the web to reduce operation costs

Internet

tool

tool

tool

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Why need WSIA?

Technical MotivationAPI users incur the effort of integrating the

application into their sites. High setup cost Maintenance cost How to ensure Quality

WSIA and WSRP provide an alternative to data-centric Web Services and simple XML APIs.

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Why need WSIA?

For API users, data-oriented Web Services require further work to transform the XML to HTML

Presentation oriented web service Data oriented web service

Database

Business logic layer Business logic layer

Presentation layer

HTML

Presentation layer

XML

Database

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Why need WSIA?

API users incur the effort of integrating the application into their sites.

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WSIA/WSRP Technology Overview

WSIA and WSRP define a set of APIsThree types of actors

ApplicationBack End Services

User Experience Services

Producers Consumers(or “integrators”)

Client

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WSIA/WSRP Technology Overview

Typical Process FlowEstablishment of a relationship between the

Consumer and Producer. (registration)Establishment of a relationship between the

Consumer and End-User. ( authentication)Production of aggregated pages by Consumer.Request for a page by End-User.Processing interactions.Destruction of relationship.

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WSIA/WSRP Technology Overview

Various levels of interaction between rolesSimpler Producer

Maintain interaction state using a sessioinSophisticated Producer

A number of entities Require consumers to register in DBMS

Simple Consumer Explicit declarations for binding to producers

Sophisticated Consumer Support discovery of new producers by End-Users.

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WSIA/WSRP Technology OverviewEnd User Interactions in simple Consumer / Producer

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WSIA/WSRP Technology OverviewEnd User Interactions in sophisticated Consumer / Producer

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WSIA/WSRP Technology Overview

WSIA and WSRP fulfill the following roles Define the notion of valid markup fragments based o

n the existing markup languages, such as HTML, XHTML, VoiceXML, cHTML...

Provide a set of standard calls to enable a Consumer to request these markup fragments from a Producer based on the existing state.

Supply a set of calls that support the concept of multistep user interaction and preservation of state across those calls

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WSIA/WSRP Technology Overview

There are four central parts to the WSIA and WSRP APIsRetrieving markup fragments (encapsulated in

the getMarkup() call)Managing stateHandling user interaction (encapsulated in the

performInteraction() call)Supporting customization and configuration

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WSIA/WSRP Technology Overview

Retrieving Markup Fragments getMarkup() call requests a markup fragment based

on the state of the Web service.

consumer producer

getMarkup() call

Fragment of Html Code

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2

3

embed into page

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Return to user

0

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WSIA/WSRP Technology Overview

Retrieving Markup Fragments Container page (adapters)

In WSIA, it can be any web application. In WSRP, it is generated by a portal toolkit.

URL rewriting Any further user interaction with the service is routed through the Consumer

application.

consumer producer

ContainerFragement / portlet

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WSIA/WSRP Technology Overview Managing State

Reasons Multistep interaction

Requiring several calls from the Consumer to the Producer. WSIA/WSRP are connectionless protocols.

Three Types of state Navigational state

Allow the current page to be correctly generated send from Producer to Consumer stored in URL’s ns parameter.

Transient state Related to a sequence of operations. ( not explicitly terminated) stored on the Producer. Consumer is then responsible for attaching it to any subsequent calls.

Persistent state Consumer Registration Entity

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WSIA/WSRP Technology Overview Handling User Interaction

All the URLs embedded in the markup fragment returned by the remote Producer service must point back to the Consumer application.

For example the consumer may send the following URL template:

www.consumer.com/path?ns=page1&si=4ABB33A

The producer is responsible for generating a markup fragment in which all the interaction URLs point back to the Consumer.

www.consumer.com/path?ns=page2&si=4ABB33A

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WSIA/WSRP Technology Overview

API CALLS FLOW

Two-step protocol

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WSIA/WSRP Technology Overview Supporting Customization and Configuration

A single hosted service can be used across multiple consumer applications and users.

Consumers can create and manage additional configurations of the same service.

For example A remote interactive product catalog may be configured to

display different prices depending on the Consumer application.

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WSIA/WSRP Technology Overview Supporting Customization and Configuration

A single hosted service can be used across multiple consumer applications and users.

Consumers can create and manage additional configurations of the same service.

For example A remote interactive product catalog may be configured to

display different prices depending on the Consumer application.

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WSIA/WSRP Technology Overview Interaction Lifecycle states

State 0:Unknown

State 1:Known

State 2:Active

discovery

registration

interaction

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WSIA/WSRP Technology Overview Operations:

Service Description Interface getServiceDescription( registrationContext,userContext)

Markup Interface getMarkup(refHandle,groupID,userContext,markupParams,te

mplates) performInteraction(refHandle,groupID,entityContext,userCont

ext,markupParams,interactioinParams) initEnvironment(registrationContext, groupID);

Registration Interface Register(registrationData); ModifyRegistration(registrationContext, registrationData); Deregister(registrationContext);

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WSIA/WSRP Technology Overview Operations: (cont.)

Entity Management Interface getEntityDesctiption(entityHandle, registrationContext, entity

Context, userContext); cloneEntity(entityHandle, registrationContext, entityContext,

userContext) destroyEntities(registrationContext, entityHandles); setEntityProperties(…); getEntityProperties(…); getEntityDescription(…);

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WSIA/WSRP Technology Overview New Data Structures

EntityDescription

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WSIA/WSRP Technology Overview New Data Structures

InteractionParams [O] StateChange entityStateChange [O] base64Binary uploadData [O] String uploadDataMimeType [O] Extension[ ] extensions

Others…

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WSIA/WSRP Technology OverviewPerforminteraction()--entityStateChange

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WSIA/WSRP Technology Overview the Consumer is managing the interaction with t

he End-User through Modes in MarkupParams

VIEW Mode EDIT Mode HELP Mode CONFIG Mode …

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WSIA/WSRP Technology Overview Markup Fragment Rules

To ensure the coherence Disallowed Tags in HTML

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Conclusion

WSIA/WSRP are important technologies that help bring the promise of Web services to end users by providinga standard to manage user interaction application display

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Conclusion

Practical solutions now Epicentric and portal vendors

Aggregating existing remote Web services into portals

IBM and J2EE application server vendors Tools to make it possible to create Web services with WSIA/WSR

P.

Webcollage and interactive application integration vendors

Helping companies package their existing Web applications, so that they can be used remotely by customers and business partners alike.

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Conclusion

WSIA/WSRP are designed to be pluggable application components that can be assembled into visually rich composite Web applications.

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Reference

Web Services Journal “Build Interactive Web Services with WSIA & WSRP HTTP://www.sys-con.com/webservices/article.cfm?id=415

Epicentric (www.epicentric.com) aggregating existing remote web services into portals.

IBM (www.ibm.com) WebCollage (www.webcollage.com) OASIS WSIA-WSRP Core specification v0.8