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1 TRAINING & CONSULTING ABIS Training & Consulting ABIS 2004 Document number: GSENL cover.fm 25 November 2004 Address comments concerning the contents of this publication to: ABIS Training & Consulting, P.O. Box 220, B-3000 Leuven, Belgium Tel.: (+32) , Fax: (+32) Copyright ABIS N.V.

2 Objectives : What is a? How to wrap Cobol into a? Best Practices ABIS Training & Consulting 1

3 What is a? 1 W3C Definition A Web service is a software system designed to support interoperable machine-to-machine interaction over a network. It has an interface described in a machine-processable format (specifically WSDL). Other systems interact with the Web service in a manner prescribed by its description using SOAP-messages, typically conveyed using HTTP with an XML serialization in conjunction with other Web-related standards. ABIS 2

4 Logical Evolution in Design Structured Design Decomposing lager processes into smaller ones Object-Oriented Development Incapsulating data and behaviour Fine-grained objects Component-Based Development A small group of objects A contractually specified interface Service-Based Development Late binding using an interface definition at compile time Web-based standards (HTTP to transfer XML) ABIS 3

5 Technology Transport HTTP (not blocked by firewalls, connection- and stateless) Messaging XML : Text-based structure using a specified character set SOAP : How to format and read an XML message Description WSDL : Operations, Messages and Protocol Registry : UDDI : To dynamically discover and locate the WSDL Service Composition : BPEL4WS : Specifying business flows ABIS 4

6 Implementation Scenarios Simple Service A small discrete function Composite Service A combination of several functions Middleware Service MOM : Message oriented middleware Third party binding using queues Service Bus Communication through a third party Multi-cast method of communication ABIS 5

7 Deployment Sender Recipient Encoder Transport Protocol Data Format Decoder Message Broker Marshalling An Object A Java Program Unmarshalling An Object A Java Program ABIS 6

8 How to wrap Cobol into a 2 The Cobol part The MQ part The part The Client part ABIS 7

9 The Cobol part 2.1 User Transaction Transaction Initiator (CKTI) BMS (CICS) Cobol Adapter Cobol Program Cobol Program Call Call Cobol Business Application DB2 Model : The Cobol business Application View : A CICS Screen / MQ Controller : The Cobol program using the Cobol Adapter or BMS ABIS 8

10 The MQ part 2.2 Init Queue 2 CKTI Trigger Monitor QSender 1 In Queue 3 Cobol Program QReceiver 5 Out Queue 4 PC Mainframe ABIS 9

11 The Part 2.3 WSDL Java Interface SOAP Client AXIS Web Service String Encoder MQ Model : MQ View : The Client Controller : The Web service ABIS 10

12 The Client Part 2.4 Client Java Interface WSDL View Controller Model AXIS Model : To hold state View Swing Application HTML Controller : manages the session ABIS 11

13 Best Practices 3 A good design (MVC) is necessary for the Cobol program Every (CICS) Screen must represent one transaction The request to a transaction can be multiple Java Beans The reply from a transaction is a Java Bean Every (Controller) level needs exception handling WSDL is necessary for deploying the application ABIS 12

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