Uni Hamburg Mainframe Summit 2010 z/os The Mainframe Operating. Part 5 Application Support

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1 Uni Hamburg Mainframe Summit 2010 z/os The Mainframe Operating Part 5 Application Support Redelf Janßen IBM Technical Sales Mainframe Systems Redelf.Janssen@de.ibm.com Course materials may not be reproduced in whole or in part without the prior written permission of IBM

2 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

3 Traditional applications Traditional applications Programming languages Object technology UNIX applications

4 What is an application? Application program Input data Process data to perform a particular task Output data

5 What is a transaction? Query Reply Transaction application program Access shared data on behalf of online user Atomicity Consistency Isolation Durability

6 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 IMS MQSeries Customer Information and Control System Information Management System Message Queuing

7 CICS Transaction Server for z/os Transaction Terminal Regions Program Library Application Regions Log File Data Region Data Region

8 IMS Transaction Manager Transaction Input Queue Application Program Library Output Queue Log File Data Manager Data Manager

9 MQSeries System 1 System 2 Program A Program B Enqueue message Dequeue message MQSeries Queue Manager MQSeries Queue Manager

10 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.

11 IMS Database Manager (Hierarchical database) z/os system IMS Control (IMS TM) DLI IMS Batch (IMS BMP) IMS Online (IMS MPP) CICS appl appl appl Online log Hierarchical database

12 DB2 Universal Database (Relational database) z/os system DB2 IMS CICS DB2 SQL SQL Log Relational databases Log Relational databases

13 Programming languages Traditional applications Programming languages Object technology UNIX applications

14 Traditional programming languages Assembler XC R_LIST(100),R_LIST Clear the range list LG 12,VIRT64_ADDR Get starting address to pagefix STG 12,R_START Save it in range list LGHI 4,5 Load number of pages to fix STG 4,R_PAGES Save it in range list SLR 12,12 Generate primary-space alet ST 12,R_ALET Save it in range list LA 4,R_LIST Get address of rangelist LLGTR 4,4 Make it a 64-bit pointer STG 4,RLISTPTR Save it COBOL PROCEDURE 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. C/C++ /* 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); FORTRAN IF (HDLR_CTOK(1:8).EQ. FOR1003) THEN INPUT_FIELD_PTR = QDLOC(HDLR_CTOK, 6) INPUT_FIELD(QDINT4(HDLR_CTOK, 7)) = '0' FIXUP_CTOK(1:8) = CEE0CE FIXUP_CTOK(9:12) = Z' ' RESPONSE = 60 ENDIF PL/1 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;

15 Compilers Source code Language compiler Executable code

16 The Language Environment - z/os C C++ COBOL PL/I FORTRAN Language Environment Subsystems CICS DB2 IMS Operating system z/os z/vm

17 Services of Language Environment User program Initialize program Allocate storage LE resident routines - In LE Link Library - Linked with user program Call another program Indicate errors (for example MSG) Handle errors * Mathematical functions * Date * Time Terminate program LE dynamic routines - In LE Runtime Library - Loaded dynamically

18 Object technology in z/os Traditional applications Programming languages Object technology UNIX applications

19 What is object technology? Conventional programming Object-oriented programming Data Program Program + Data

20 Object-oriented technology In-house objects Application Vendor objects

21 Classes and objects Generic Class Generic Class Classes Name Data Method Account Name Acct.No. Open Account Close Account Inheritance Name Data Method Checking Account Name Acct.No. Balance Open Account Close Account Deposit Withdrawal Name Data Method Loan Account Name Acct.No. Inter.Rate Principle Open Account Close Account Payment Name Data Method Checking Account J.Baker # $ 2,500 Open Account Close Account Deposit Withdrawal Object = real Account

22 J2EE and Enterprise Java Beans IIOP z/os Application Server Instance J2EE compliant client HTTP client HTTP HTTP Server ORB Daemon w O R K L O A D M G M T JVM and core classes Scalability Container J2EE compliant objects WebSphere Application Server for z/os Transaction Servers Corporate Databases

23 UNIX applications Traditional applications Programming languages Object technology UNIX applications

24 UNIX basic structure Coded in C Application programs C Shell End-user interface Command interpreter C C Utilities Kernel Editor Compiler File handling commands Process control/synchronization File system Hardware driver dev / user Ass/C Hardware interface Hardware independence for kernel a Files Hardware

25 UNIX System Services overview Traditional application UNIX application Network Traditional z/os services z/os data sets HFS/zFS files

26 Application development z/os applications Mixed applications UNIX applications Application programming interfaces z/os services UNIX services MVS data sets HFS

Uni Hamburg Mainframe Summit 2010 z/os The Mainframe Operating. Part 4 z/os Overview

Uni Hamburg Mainframe Summit 2010 z/os The Mainframe Operating Part 4 z/os Overview Redelf Janßen IBM Technical Sales Mainframe Systems Redelf.Janssen@de.ibm.com Course materials may not be reproduced