Architecting Java solutions for CICS Architecting Java solutions for - PowerPoint PPT Presentation

Architecting Java solutions for CICS

Architecting Java solutions for CICS Course introduction

Course introduction Reasons for hosting Java in CICS Requirements: Knowledge of transaction processing Experience of Java development

What you’ll learn by the end of this course 1. CICS as a mixed language application server 2. Integrating Java applications into a mixed language environment 3. Different ways of developing and deploying Java

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Overview of Java in CICS Mixed language applications in CICS

What is CICS? Mixed language application server High volume on-line transaction processing Provides services to host applications Multi-user access to data and messaging

What is CICS? 1. Transactional integrity 2. High security 3. Workload management 4. Wide range of standard connectors

CICS – A mixed language application server COBOL REXX PL/I PHP Assembler Java C/C++ Mixed language application server

Mixed language applications in CICS 1. Inter-language calling between components COBOL, Java and other languages Common interfaces Independant development

Mixed language applications in CICS 2. Standard APIs EXEC CICS command API Language neutral syntax Translated at compile time Language specific implementation for Java

Mixed language applications in CICS 3. Container management Transactions and security CICS task provides UOW and security context Spans across multiple language components

Multiple language components CICS task Channels and containers COBOL COMMAREA component storage Java component C Security & transaction context component

Calling components with a COMMAREA TASK0001 (Transaction: TRAN) PROGRAM A PROGRAM B COMMAREA FIELD1–“INPUTDATA” COMMAREA FIELD2–123456 READ COMMAREA FIELD3–“” BUSINESS LOGIC LINK PROGRAM TO PROGRAM B MODIFY COMMAREA WITH ADDITIONAL COMMAREA DATA FIELD1–“INPUTDATA” FIELD2–123456 FIELD3–“OUTPUTDATA”

Calling components with channel & containers TASK0001 (Transaction: TRAN) PROGRAM A CHANNEL PROGRAM B CREATE INPUT CONTAINER CHANNEL OUTPUT CONTAINER READ INPUT CREATE INPUT CONTAINER CONTAINER LINK TO BUSINESS CHANNEL PROGRAM B LOGIC CREATE OUTPUT CONTAINER READ OUTPUT CONTAINER RETURN

EXEC CICS API and translator EXEC CICS LINK PROGRAM ( ) Translator Language specific statements Compiler

CICS transactions CICS task Transaction Definition Initial Program Security Context Unit of Program work Program

Overview of Java in CICS Java support in CICS

Why use Java? Popular language Readily available skills Rich set of tools Lower operating costs

Java components Java source code Java compiler Java class Bytecode libraries JVM Class loaders Threads & Interpreter synchronization Garbage collector JIT compiler

Java support on z/OS Java class libraries z/OS extension libraries Java source Crypto Health … … awt net i/o sql JZOS code support Center JVM Class loaders Garbage collector Interpreter Threads & synchronization JIT compiler z Systems hardware instructions

Moving eligible work to zIIP System z Java Java Java Java Java Java General zIIP CP

Java support in CICS CSD CICS JVMSERVER JVM server System Initialization Table (SIT) Java applications JVMPROFILEDIR= zFS directory JVM profile

Types of JVM server OSGi JVM server Liberty JVM server Classpath JVM server

Embedded CICS functions Axis2 web services engine JSON web services JSON parsers SAML Dynamic scripting (PHP)

OSGi JVM server MQ CICS JMS JVM server JDBC DB2 Java applications JCICS VSAM file TD & TS queues HTTP TCPIP COBOL PROGRAM Service program 3270 APPC EXEC CICS LINK EXEC CICS START

OSGi JVM OSGi framework OSGi registry OSGi bundle com.package.aaa com.package.zzz HelloWorld ClassX ClassA ClassY ClassB ClassZ

OSGi JVM server CICS JVM server OSGi framework OSGi service registry OSGi bundle EXEC CICS LINK PROGRAM com.ibm.MyClass1 PROGRAM ( ) MYPROG1 OSGi bundle EXEC CICS START com.ibm.MyClass2 TRANSID( )

Liberty JVM server MQ CICS JMS JVM server JDBC HTTP Database Java EE web application JCICS VSAM file TD & TS queues EXEC CICS LINK COBOL program

Link to Liberty CICS JVM server Liberty server Web app EXEC CICS LINK PROGRAM POJO MYPROG1 PROGRAM ( )

Integrated and standard mode Liberty Standard mode Requests do not run on CICS enabled threads by default Provides high zIIP offload

Integrated and standard mode Liberty Integrated mode Requests run on CICS enabled threads EXEC CICS LINK command to POJOs Integrated with CICS transactions and security

Java EE application packaging WAR file Web app EAR file Web app CICS bundle EJB EBA file Web app OSGi bundle

Java EE application deployment WAR file OSGi bundle { CICS Web app JVM server Dropins EAR file Web app EJB server.xml EBA file Web app CSD CICS BUNDLE CICS bundle definition project

Overview of Java in CICS Java application development for CICS

Java APIs supported in CICS Java Standard Edition Java Enterprise Edition JCICS JDBC & JMS z/OS extension libraries

Java Standard Edition User Interface Toolkits AWT Swing Print Service Integration libraries JDBC JNDI RMI Base libraries lang and util Networking XML JNI Security

JCICS CICS region Java application Java class libraries JVM JCICS API Java Native Interface Transient Temporary VSAM Data Storage

JCICS Task – Syncpoint control and abends Program – Link command TSQ and TDQ – Accessing queues KSDS, ESDS and RRDS - VSAM files StartResource - Asynchronous processing CICSConditionException - Error response codes

Java Enterprise Edition Java Enterprise Edition – Java EE 7 Java EE 6 & Java EE 7 JSR specifications Java EE web profile

Java EE – Web profile highlights Subset of full platform Core web technology – Servlets/JSPs RESTful JSON web services Local EJB support Contexts and Dependency injection Web sockets

Java EE – Full platform highlights Web application tier Servlets JSPs JSF Java Beans Business application tier Java web services EJB JPA Managed beans Enterprise access tier JDBC JPA JMS JCA JTA Batch processing

CICS Explorer SDK for Java Workstation Eclipse IDE CICS Explorer SDK z/OS CICS bundle project Export to zFS OSGi bundle project zFS CICS region CICS build tookit Web project

Overview of Java in CICS Use cases for Java applications in CICS

Use cases for Java applications in CICS 1. Java web applications 2. Java web services 3. Java components in CICS applications 4. Java batch

Benefits for all Java applications in CICS Lower costs Fast response times High developer productivity z/OS platform qualities of service

Java web applications CICS region DB2 JVM server VSAM Liberty Web Web MQ browser application CICS program

Java web applications Host web applications from other platforms Simplified administration Potential to lower costs Manage together with CICS components Option to tightly integrate with CICS

Java web services CICS region DB2 JVM server VSAM Liberty JSON Web MQ application SOAP CICS program

Java web services Industry standard formats Customizable processing Data mapping tools

New Java components CICS region DB2 JVM server VSAM CICS Java MQ program application CICS program

Java components Modernize CICS applications Java development Reuse Java components CICS mixed language environment

Java batch CICS region Shared repository CICS region JVM server JVM server Persistent Liberty Liberty database Job Batch Batch Clients repository dispatcher executor CICS region JVM server Liberty Messaging engine server

Java batch Can be run with online transactions Flexible scheduling Parallel processing Automatic restart after failures Optimized Java execution

Summary Course review

Course review Invoke CICS programs from Liberty Used JCICS to access VSAM files TSQs Unit of work support Error handling