© copyright iona technologies 2002 part 2: web service composition: unlocking your interface...

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PART 2: Web Service Composition: Unlocking Your Interface Potential

Seumas Soltysik

Senior Software Engineer, XMLBus

Preparing Your Enterprise for Web Services

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Integration: The “Killer App” for Web Services

• Set of industry standards for distributed computing

• Service-oriented architectures enable End to Anywhere™ integration

• E2A changes the economics of integration

• Web services is the driving technology

– Simple

– Effective

– Unanimous industry support

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The Statement

Web Services should not be a regurgitation of existing infrastructure but

should build on top of that infrastructure to define a set of flexible services to handle

the evolving needs of a business.

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The Agenda

• The Typical Web Service of Today• The Need for Coarser Grained Web Services• Separating Interface from Implementation• Operation Flow Designer

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The Present- How it is

Companies with existing CORBA and EJB services are exposing those services directly as Web Services.

This solution is too fine-grained and locks Web Service to interface of EJB/CORBA

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The Future- How it Should Be

• Ease of Composition: Through a graphical user interface

• Ease of Change: to support new and evolving business processes and requirements

• Ease of aggregation: Grouping disparate applications within the value chain together to fulfill new business requirements

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The Future is Now-Interface Mapping

What Interface Mapping Does Breaks the tie between the Web Service interface

exposed by WSDL and the EJB/CORBA interfaces by defining a single Web Service based upon multiples existing EJB/CORBA services

Avoids fine-grained Web Services which leads to unnecessary chatter on the wire

Allows user to rapidly generate a Web Service based upon existing services. Low cost of building and destroying Web Services

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Interface Mapping

What Interface Mapping Is Not Interface Mapping is NOT workflow

Interface Mapping involves making fine-grained invocations that are not long-term in scope

Interface Mapping is limited to leveraging existing EJB and CORBA services and is not about Document management/flow

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From EJB to Web Service

//HOME Interface

public interface iBankAuthorizationHome extends EJBHome {

public iBankAuthorization create() throws RemoteException, CreateException;

}

//Remote Interface

public interface iBankAuthorization extends EJBObject {

public void logout() throws RemoteException;

public int login(String userName, String password)

throws RemoteException, iBankLoginException

public int newAccount(String userName, String password)

throws RemoteException, CreateException

}

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From EJB to Web Service

//HOME Interface

public interface iBankAccountHome extends EJBHome {

iBankAccount create(Integer accountID, double balance)

throws RemoteException, CreateException;

iBankAccount findByPrimaryKey(Integer accountIDKey)

throws FinderException, RemoteException;

}

//REMOTE Interface

public interface iBankAccount extends EJBObject {

public String getName() throws RemoteException

public double getBalance() throws RemoteException

public void deposit(double amount) throws RemoteException,

public void withdraw(double amount) throws RemoteException

public void setPassword(String oldPassword, String newPassword)

throws RemoteException }

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Network Chatter-Invoking the EJBs

Obtaining Account Information(Balance, Name, ID)Object obj = ctx.lookup("java:comp/env/ejb/iBankAuthorization"),iBankAuthorizationHome iBankAuthHome =

(iBankAuthorizationHome)PortableRemoteObject.narrow(obj, iBankAuthorizationHome.class);iBankAccountHome accountHome = (iBankAccountHome)PortableRemoteObject.narrow( ctx.lookup("java:comp/env/ejb/iBankAccount"), iBankAccountHome.class);

iBankAuthorization iBankAuth = iBankAuthHome.create();int acctID = iBankAuth.login(name, password);account = accountHome.findByPrimaryKey(new Integer(acctID));Float balance = account.getBalance();String accountName = account.getName();

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Avoiding Network Chatter

• The Problem- How do you construct a Web Service which returns all account information– Turning each method call into a Web Service leads to highly chatty,

fat Web Services– Web Services mimic EJB interfaces

• The Solution-Operation Flow Designer– Graphical based tool for linking EJB and CORBA invocations

without having to write code– Allows user to assemble a Web Service whose interface is loosely

coupled to existing EJB/CORBA services– Free to define a Web Service interface any way you want

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Creating a Home Lookup Activity

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Creating a Method Activity

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Associating Activities

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The Whole Enchilada

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The Abstract Interface-WSDL<definitions name="BankFlowService" targetNamespace="http://xmlbus.com/BankFlowApp"

xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="http://xmlbus.com/BankFlowApp" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsd1="http://xmlbus.com/BankFlowApp/xsd">

- <message name="login"> - <part name="User_Name_Input" type="xsd:string" /> - <part name="Password_Input" type="xsd:string" />

- </message>- <message name="loginResponse">

- <part name="Name_Output" type="xsd:string" /> - <part name="Balance_Output" type="xsd:double" /> - <part name="Account_ID_Output" type="xsd:int" />

- </message>- <portType name="BankFlowPortType">-

- <operation name="login"> - <input message="tns:login" name="login" /> - <output message="tns:loginResponse" name="loginResponse" />

- </operation> - </portType>- <binding name="BankFlowPortBinding" type="tns:BankFlowPortType">- <service name="BankFlowService"> </definitions>

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History• Founded in Ireland in 1991; IPO on Nasdaq in 1997• Global company with headquarters in Dublin, Ireland and Waltham, MA

Financial Performance• Calendar year 2001 statistics

– Revenues $181 million (65% license / 35% services)– Positive operating margins

Team• Over 900 employees in over 30 offices worldwide with a sales force of over 300• Strong blue chip customer and partner base

IONA is a leading provider of comprehensive, standards-based enterprise infrastructure solutions for customers to build, deploy and integrate mission-critical applications that power core business processes

The IONA Story

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• Integration broker platform• Connects existing applications and services• Allows creation of automated business

process flows across extended enterprise using Web Services and XML standards

• Application server platform for developing, deploying and managing business application logic

• Hosted in J2EE, CORBA or mainframe environments using Web services standards

It Takes A Platform

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Web Services Integration Now!• Visit XMLBus.comXMLBus.com and download Orbix

E2A™ XMLBus Edition.• Sign up for IONA training on Web

services• Download IONA’s Web services white

paper at XMLBus.comXMLBus.com• Check out Orbix E2A™, the first e-

Business Platform for Web Services Integration.

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Upcoming Webcasts

Don’t forget IONA WorldOctober 27 - 30th, San Diego, CA

PART 3: B2B Collaboration: Expanding Web Services Architectures Tuesday, May 28

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I Want My MTV!

To experiment with the Operation Flow Designer go to:

www.xmlbus.com

and download XMLBus

© copyright iona technologies 2002 part 2: web service composition: unlocking your interface...

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