uni hamburg – mainframe summit 2010 z/os – the · pdf filedatabase management...

© Copyright IBM Corporation 2010Course materials may not be reproduced in whole or in part without the prior written permission of IBM. 4.0.1

Uni Hamburg – Mainframe Summit 2010 z/OS – The Mainframe Operating

Part 5 – Application Support

Redelf JanßenIBM Technical Sales Mainframe Systems

[email protected]

© Copyright IBM Corporation 2010

Unit objectives

After completing this unit, you should be able to:

●Describe the support provided for object-oriented application development on z/OS

●Describe the purpose of the Language Environment


Traditional applications

Programming languages

Object technology

UNIX applications



Application program

Input data

Outputdata

Process data to perform a particular task

What is an application?


Query

Transactionapplication program

Access shared data on behalf of online user

Reply

AtomicityConsistencyIsolationDurability

What is a transaction?


Transaction processing monitors

●A transaction processing monitor is a program that monitors a transaction as it passes from one stage in a process to another.

●TP monitors ensure that a transaction processes completely, or if an error occurs, that appropriate actions are taken.

●TP monitors connect multiple clients to multiple servers to access multiple databases.

●CICS Customer Information and Control System● IMS

Information Management System●MQSeries

Message Queuing


Transaction TerminalRegions

ApplicationRegions

DataRegion

DataRegion

ProgramLibrary

Log File

CICS Transaction Server for z/OS


Transaction InputQueue

Application

DataManager

DataManager

ProgramLibrary

Log File

OutputQueue

IMS Transaction Manager


Program A

Enqueue message

Program B

Dequeue message

MQSeriesQueue Manager

MQSeriesQueue Manager

System 1 System 2

MQSeries


Database management systems

●Database management systems allow multiple independent users to have concurrent access to a central repository of information.

●Database management systems provide data integrity by ensuring that all steps within a unit of work are completed successfully or all changes are backed out.

●Database management systems provide centralized security for the database and allow installations to control which users have access to specific data within the database.


IMSControl (IMS TM)

DLI IMSBatch (IMS BMP)

IMSOnline (IMS MPP)

CICS

Hierarchicaldatabase

Onlinelog

appl

appl

z/OS system

appl

IMS Database Manager (Hierarchical database)


DB2 IMS CICS DB2

z/OS system

SQL

SQL

DB2 Universal Database (Relational database)

Log Relationaldatabases

Log Relationaldatabases




Object technology

UNIX applications



XC R_LIST(100),R_LIST Clear the range listLG 12,VIRT64_ADDR Get starting address to pagefixSTG 12,R_START Save it in range listLGHI 4,5 Load number of pages to fixSTG 4,R_PAGES Save it in range listSLR 12,12 Generate primary-space aletST 12,R_ALET Save it in range listLA 4,R_LIST Get address of rangelistLLGTR 4,4 Make it a 64-bit pointerSTG 4,RLISTPTR Save it

AssemblerPROCEDURE DIVISION.

EXEC CICS READ DATASET("INFILE")RIDFLD(INFILE-KEY)SET(ADDRESS OF VAR-RECORD)

LENGTH(RECORD-LEN)END-EXEC.MOVE VAR-RECORD TO WS-RECORD-HOLD.

COBOL

IF (HDLR_CTOK(1:8) .EQ. FOR1003) THENINPUT_FIELD_PTR = QDLOC(HDLR_CTOK, 6)INPUT_FIELD(QDINT4(HDLR_CTOK, 7)) = '0'FIXUP_CTOK(1:8) = CEE0CEFIXUP_CTOK(9:12) = Z'00000000'RESPONSE = 60

ENDIF

FORTRAN/* Now print the string in the file */

fp = fopen("PROG.DAT","rb");rc = fgets(buffer,sizeof(buffer),fp);if (rc == NULL){

perror(" Error reading from file ");exit(99);

}printf("%s", buffer);

C/C++

PUT SKIP LIST( RS_STRING || REASON_CODE ); IF RETURN_CODE = 0 THEN

DO; /* Write the signature and its length to the output file. */FILE_OUT_LINE = SIG_LEN_STRING || SIGNATURE_LENGTH;WRITE FILE(SIGOUT) FROM( FILE_OUT_LINE );FILE_OUT_LINE = SIG_STRING || SIGNATURE;WRITE FILE(SIGOUT) FROM( FILE_OUT_LINE );

END;

PL/1

Traditional programming languages


Source code

Executablecode

Languagecompiler

Compilers


C C++ COBOL PL/I FORTRAN

Language Environment

Subsystems

CICS DB2 IMS

Operating systemz/OS z/VM

The Language Environment - z/OS


Initialize program

Indicate errors(for example MSG)

* Mathematical functions* Date* Time

Allocate storage

Call another program

Handle errors

Terminate program

User programLE resident routines

LE dynamic routines

-

In LE Link Library-

Linked with user program

-

In LE Runtime Library-

Loaded dynamically

Services of Language Environment




Object technology

UNIX applications

Object technology in z/OS


Conventional programming

Program

Data

Object-orientedprogramming

Program + Data

What is object technology?


ApplicationIn-house objects Vendor objects

Object-oriented technology


Open AccountClose AccountDepositWithdrawal

NameAcct.No.Balance

Checking Account

Name Data MethodOpen AccountClose AccountPayment

NameAcct.No.Inter.RatePrinciple

Loan Account

Name Data Method

Open AccountClose Account

NameAcct.No.

AccountName Data Method

Generic ClassGeneric Class

Open AccountClose AccountDepositWithdrawal

J.Baker#123456$ 2,500

Checking Account

Name Data Method

Inhe

ritan

ce

Classes

Object =real Account

Classes and objects


HTTP

JVM

and

cor

e cl

asse

s S

cala

bilit

y

wORKLOAD

MGMT

Application Server Instance

HTT

P S

erve

rO

RB

Dae

mon

Corporate Databases

Transaction Servers

z/OS

HTTP client

J2EE compliant client

IIOP

J2EE compliant objects

Container

WebSphere Application Server for z/OS

J2EE and Enterprise Java Beans




Object technology

UNIX applications

UNIX applications


Application programs

Shell

Utilities

Kernel

Hardware interface

Hardware

Coded in

dev user

/

Filesa

End-user interfaceCommand interpreter

EditorCompilerFile handling commandsProcess control/synchronizationFile systemHardware driver

Hardware independencefor kernel

C

C

C

C

Ass/C

UNIX basic structure


Traditional z/OSservices

Traditionalapplication

UNIXapplication

z/OS data sets HFS/zFS files

Network

UNIX System Services overview


z/OSapplications

Mixedapplications

UNIXapplications

z/OS services

Application programming interfaces

MVSdata sets

HFS

UNIX services

Application development

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