5. Using Java to Access CA-Datacom

7/27/2019 5. Using Java to Access CA-Datacom

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managed & organised by QED Business Systemssponsored by Computer Associates

The simple way to have

Java applications withCA-Datacom

Need a GUI interface to your CA-Datacom data?This is the easy way!


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Abstract

Theres no reason why developers of non-mainframe

applications shouldnt benefit from using data in

mainframe CA-Datacom. This session explains a

straight-forward and highly effective approach to

having Java applications that can access and

maintain data in mainframe CA-Datacom.

Users prefer GUI interfaces to mainframe green

screens, and using Java brings many benefits to

application development. This session introducesthese benefits to the non-Java audience, and

shows how these benefits can be further enhanced

by linking with CA-Datacom.


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Agenda

What is Java?

Accessing CA-Datacom from Java

Demo of doing this the easy way!

Why do it?

Summary


4/36managed & organised by QED Business Systemssponsored by Computer Associates

What is Java?



What is Java?

Programming language

Runtime system

Development tools

Java Virtual Machine

Interpreter

Executes byte codes

Standard class file format

Ported to many hardware platforms



A brief history of Java

1990 - James Gosling & colleagues, Sun

Microsystems, develop Oak

1995 Java freely available from Sun 1998 Java 2 incorporates additional features



Java Background

Massive marketing by Sun

Arrival of world wide web

Requirement for architecture-neutral language

Vast body of technical expertise



Java Features

Simple language similar to C++

Object-oriented focus on data & interface

Distributed

Robust, Secure


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More Java Features

Architecture-neutral

Portable

Interpreted

High performance, Multi threaded

Dynamic


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Java Terms & Concepts

Objects everything is considered an object

Classes a particular type of object

Encapsulation combining data & code intoa single object

Inheritance the derivation of one class fromanother

Polymorphism ability to assume several

different forms or shapes; the ability of a singlevariable to invoke different methods,

depending upon what the variable contains


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Java Basics

Source code

Compiler

Byte Codes

Interpreter

App.java

Javac App.java

App.class

Windows

Java VM

Linux

Java VM

z/OS

Java VM


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My first Java program

Program container

public class Hello { }

Main methodpublic static void main (String[] args) { }

Statement

System.out.println(Hello World);


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Java Platform

Java Virtual Machine

Java API


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A few Java definitions

J2EE Java 2 Enterprise Edition

used to develop, deploy & manage multi-tier, server

centric applications J2ME Java 2 Micro Edition

Java platform for embedded devices (cellphones &

PDAs)

J2SE Java 2 Standard Edition

Javascript

Embedded as small program in web page to control

appearance & action of browser


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Accessing CA-Datacom fromJava


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JDBC

Java Database Connectivity

API

Provides data access for Java programminglanguage

Complex, multi-tiered architecture


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JDBC Flow Type II Connection

PC PlatformJava application

CA-Datacom Server JDBC Driver

CA CCI

CA CCI

CA-Datacom Server

CA-Datacom

Mainframe Platform


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JDBC Flow Type IV Connection

Mainframe Platform

CA CCI

CA-Datacom Server

CA-Datacom

PC Platform

Java application

CA-Datacom JDBC

Proxy

PC Platform

CA-Datacom Java Server

(NT service, Linux)

CA-Datacom Server

JDBC Driver

CA CCI


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JDBC Flow z/OS Unix

Mainframe Platform

CA CCI

CA-Datacom Server

CA-Datacom

Java application

CA-Datacom Server JDBC Driver

CA CCI


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HTTP/XML Flow

PC PlatformJava application

Mainframe Platform

CICS & FireXML for CA-Datacom

CA-Datacom


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Demo of accessingCA-Datacom from Java


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Using the HTTP/XML approach

Simple architecture

Minimal installation

Nominal ongoing administration Standard Java programming techniques

Direct access to data in CA-Datacom Robust

High performance


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CA-Datacom

Demo architecture

Sysadm

.Cust

Sysadm

.Orders

Sysadm

.Items

Sysadm

.Detail

Order-entry (dbid 010)

CICS

FireXML

internet

Windows XP

Java VM

QED mainframe


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FireXML processing

DBMS

zOS,

OS390, VSE

mainframe

CICS

FireXMLBroker

browser,

web serverapplication(Java, Perl, C#,

C++, VB, ASP)

MR SMI TH

1 HI GH STREETANYTOWN

4. HTTP/XML

output document

SELECT NAME, ADDRESSFROM CUSTOMER WHERECUST_I D = 1234

2. SQL statement validated

and passed to DBMS

MR SMI TH , 1 HI GH STREETANYTOWN

3. DBMS returns

result set

SELECT NAME, ADDRESSFROM CUSTOMER WHERECUST_I D = 1234

1.. HTTP/SQL

input statement

existing 3270 applications


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Java coding 1

Import packages

import java.net.*;

import java.util.*;

import org.xml.sax.InputSource;

import org.w3c.dom.*;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.TransformerException;

import javax.xml.transform.TransformerConfigurationException;

import javax.xml.transform.dom.DOMSource;


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Java coding 2

Declare variables

private String URL = "qed_mf1:3000"; /* Default FireXML mainframe */private String initSQL = "Select distinct STATE from sysadm.cust order

by STATE;";

J di 3


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Java coding 3

Code connection URL

HttpURLConnection urlConn = (HttpURLConnection)

url.openConnection();urlConn.setDoOutput(true);

urlConn.setDoInput(true);

urlConn.setRequestMethod("POST");

urlConn.setRequestProperty("Content-length",Integer.toString(requestBody.length()));

OutputStream os = urlConn.getOutputStream();

OutputStreamWriter out= new OutputStreamWriter(os);

out.write(requestBody);

out.flush();out.close();

J di 4


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Java coding 4

DOM processing

DOMParser parser = new DOMParser();

ByteArrayInputStream xmlIS = new ByteArrayInputStream(

XML.getBytes());

try {statusUpdate("XML received from mainframe - parse the XML");

parser.parse( new InputSource(xmlIS) );

document=parser.getDocument();

Th d


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The demo

JavaDatacom demo.lnk
http://../FireXML/Demos/SalesDemo/salesdemo.bathttp://../FireXML/Demos/SalesDemo/salesdemo.bat


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What does this all mean?

O ti l i


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Operational issues

Installation & configuration

Concurrent usage

Security Performance

Maintenance & support

Integration benefits


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Integration benefits

Standard code with GUI interfaces

Use existing CA-Datacom data

Use of Java IDEs (eg. .Net, Sun ONE, Eclipse, Borland

Jbuilder, Websphere Development Studio)

Further info


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Further info

IBM Java support links

Java 2 on the z/OS platform

http://www-1.ibm.com/servers/eserver/zseries/software/java

Java on z/OS hints & tipshttp://www-

1.ibm.com/servers/eserver/zseries/software/java/javafaq.html Java Programming Guide for z/OS Redbookhttp://publib-

b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65f/1f8767e73398d70085256760007b9ac1?OpenDoc

ument&Highlight=0,Java

More links
http://www-1.ibm.com/servers/eserver/zseries/software/javahttp://www-1.ibm.com/servers/eserver/zseries/software/java/javafaq.htmlhttp://www-1.ibm.com/servers/eserver/zseries/software/java/javafaq.htmlhttp://publib-b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65f/1f8767e73398d70085256760007b9ac1?OpenDocument&Highlight=0,Javahttp://publib-b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65f/1f8767e73398d70085256760007b9ac1?OpenDocument&Highlight=0,Javahttp://publib-b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65f/1f8767e73398d70085256760007b9ac1?OpenDocument&Highlight=0,Javahttp://publib-b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65f/1f8767e73398d70085256760007b9ac1?OpenDocument&Highlight=0,Javahttp://publib-b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65f/1f8767e73398d70085256760007b9ac1?OpenDocument&Highlight=0,Javahttp://publib-b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65f/1f8767e73398d70085256760007b9ac1?OpenDocument&Highlight=0,Javahttp://publib-b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65f/1f8767e73398d70085256760007b9ac1?OpenDocument&Highlight=0,Javahttp://publib-b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65f/1f8767e73398d70085256760007b9ac1?OpenDocument&Highlight=0,Javahttp://www-1.ibm.com/servers/eserver/zseries/software/java/javafaq.htmlhttp://www-1.ibm.com/servers/eserver/zseries/software/java/javafaq.htmlhttp://www-1.ibm.com/servers/eserver/zseries/software/java


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More links

Sun

http://java.sun.com

FireXML http://www.firexml.com

General http://www.java.net

Session Summary
http://java.sun.com/http://www.firexml.com/http://www.java.net/http://www.java.net/http://www.firexml.com/http://java.sun.com/


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Session Summary

What is Java?

Accessing CA-Datacom from Java

Demonstration of HTTP/XML approach

Combining the benefits of Java with the

benefits of CA-Datacom Using standard HTTP and XML

The easy way!


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5. Using Java to Access CA-Datacom