IMPLEMENT A TRANSACTION

USING A WEB SERVICE

COMP6017 – CourseWorkCOMP6017 – CourseWork

MSc. Web Technology 2009-2010

Chen, Cheng-Che : 23361301

GK, Eakan : 23813172

Sun, Wei : 23656018

Agenda

� Transaction – A brief Introduction

� Transactions in Web Services

� WS Co-ordination and WS Transaction

� Web Services Interoperability Toolkit� Web Services Interoperability Toolkit

� NetBeans IDE Integrated with WSIT

� Implementation

� Questions (if any)

Transaction� What is a Transaction?

� ACID Properties

Atomic, Consistent, isolated, and durable (ACID)

Transactions in Web Services

� In Web Service transactions we do not need to

abide to the ACID properties. But for long

transactions consistency has to be maintained.

� Need some forms of correlation, but not necessarily

require transaction behavior.

WS-Coordination

� The primary goal of WS-Coordination

� Components of WS-Coordination:

WS-Coordination

� WS-Coordination addresses fundamental issues in

coordination among Web services:

1. SOAP extensions

2. Meta-protocols2. Meta-protocols

3. Middleware components

WS-Transaction

� Atomic Transactions:

Completion, 2PC, Completion WithAck, PhaseZero,

OutcomeNotification.

� Business Activities:� Business Activities:

BusinessAgreement ,

BusinessAgreementWithComplete

Web Services Interoperability Technologies

� What is WSIT?

-- A product of Sun Microsystems web services

interoperability to develop Java clients and service

providers.providers.

-- An implementation of a number of open web

services specifications to support enterprise features.

Web Services Interoperability Technologies

� Goal

> Interoperability with Microsoft Windows

Communication Foundation (WCF, a.k.a. “Indigo”)

> Implementation of WS-* specifications> Implementation of WS-* specifications

> Foundation for building SOA

WSIT Features� Bootstrapping and Configuration

� Message Optimization Technology

� Reliable Messaging Technology

� WS-Security

Implementation

� NetBeans IDE

� GlassFish v2.1

� Java EE

� Java Metro Stack(Project Tango)� Java Metro Stack(Project Tango)

� Web Services Interoperability Toolkit

� Java WS

� Enterprise Java Beans

� Java Transaction API

EJB : BankWebServiceBean

� public void init()

� public int debitAccount(String accnum, String amount)

� public int creditAccount(String accnum, String amount)

Web Service Attributes

Screen-shots of Client – Main Page

Screen-shots of Client – AccountDetails

TransferServlet

public class TransferServlet extends HttpServlet {

...

..

@Resource

UserTransaction ut;

..

..

@WebServiceRef(wsdlLocation = "WEB-

INF/wsdl/localhost_8080/BankWebServiceBeanService/BankWe

bServiceBean.wsdl")

private BankWebServiceBeanService service;

TransferServlet : processRequestprotected void processRequest(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException,

Exception {

...

bwsb.BankWebServiceBean port =

service.getBankWebServiceBeanPort();

..

port.init();port.init();

try {

ut.begin(); //demarcate beginning of transaction

result = port.debitAccount(dest_account, amount);

result = port.creditAccount(dest_account, amount);

ut.commit();

}catch(Exception e) {ut.rollback();}

References:� Java EE 5 Tutorial, Sun Microsystems

� Java Web Services Tutorial, Sun Microsystems

� Teach Yourself Web Services in 24 Hours, Sams

Publishing

� NetBeans : The Definitive Guide, O’ReillyNetBeans : The Definitive Guide, O’Reilly

� Project Tango: Overview, Sun Microsystems

� WSIT Tutorial, Sun Microsystems

� WS Atomic Transaciton, WS Coordination

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