Transcript EGL - IBM
Enterprise Generation Language Doug Fulmer WW Sales Exec, e-bus Infrastructure iSeries 2337 Hazy Meadows Ln Flower Mound, TX 75028 Tel 972-724-0288 (Bus) Tel 972-724-1202 (Home) Tel 214-507-0859 (Cell) [email protected] Developer’s Road Map Presentation Today Better Tools 5250 5250 Better User Interface Better Architecture Better Portability Better Scalability Web Web Services Logic RPG/COBOL Tools PDM ILE RPG/COBOL Java WDS AE / RSE WDS / RSE iWA EJBs Web Tools Java Tools WebFacing HATS DB2 / DDS Database J2EE / EJBs WAS Express WebSphere Customers and partners may enter the map at any stage and may choose to exit at any stage as well. SQL Stored Proc / Triggers Portal Express WAS Base WAS ND Portal Express Plus WebSphere MQ WebSphere BI © 2004 IBM Corporation PAGE 2 RSE = Remote System Explorer Development in the era of e-Business • Maintain and Extend existing core systems • Develop new strategic Internet based systems – Support the entire spectrum of e-Business solutions • Simple Web • Complex Transactional systems • Integrated Business Processes • Modernize and Integrate existing core systems © 2004 IBM Corporation PAGE 3 Application Development Challenges • Lack of a cohesive, systematic, comprehensive approach – Islands of AD tasks optimization • Fragmented, obsolete, poor or absent – Methodologies and Processes – Architectural and Implementation Best Practices – Tools • Complexity of new technologies – Skills mismatches – Slow skills ramp-up – Slow, error prone development • Legacy – Not integration-ready – Costly to maintain © 2004 IBM Corporation PAGE 4 Application Construction Challenges User Interface Control Logic Servlets Struts JSF HTML JSP WML VML JSF Portlets WSDL SOAP UDDI XML SOA BP Choreography Many parts Many standards and APIs Complex Architectural Structure © 2004 IBM Corporation PAGE 5 Business Logic JavaBeans EJB EGL CICS RPG COBOL Enterprise Information Connection JDBC JCA JMS EGL Web Services Business Process Integration High Skills … Slow ramp-up Many Tools, Methodologies, Processes Slow, error prone development WebSphere Studio Solution User Interface Control Logic Business Logic Enterprise Information Connection Web Services Business Process Integration Test and Deployment Made Easy! Comprehensive, well integrated developer assistance tools © 2004 IBM Corporation PAGE 6 Increase productivity Lower skills requirements Why Enterprise Generation Language? • Pressure to move to Java/J2EE • Available developers skills are business oriented programming technologies – COBOL, PL/I, RPG, 4GL • Cost of re-training can be significant – Gartner study finds that cost can be over $20,000 per developer • Business pressure may not afford time to re-train • Results may be sub-optimal – Application architecture – Maintainability – Performance © 2004 IBM Corporation PAGE 7 Rapid Development with JSF and EGL User Interface Control Logic Business Logic Enterprise Information Connection Web Services Business Process Integration JSF RAD tools virtually eliminates complex error prone manual coding Point and click Web presentations Control Logic and Navigation automation Rich UI components No-code input validation EGL simplifies business logic and shields from complexities of data access (Databases, Files, Message Queues) and legacy integration High level simple I/O verbs insulate from coding data access APIs Procedural easy to learn language Simple CALL interface to existing programs insulates from connectivity APIs © 2004 IBM Corporation PAGE 8 EGL – What Is It? • EGL = Enterprise Generation Language – High level programming specifications – Hides complexities of implementation technology • For the non-Java programmer • For the non-CICS programmer • Special Parts + Scripting Language – Stored in files managed by workbench repositories • Interactive Development and Debugging – Environment independent language – Built-in debugger – Can be used for RAD development © 2004 IBM Corporation PAGE 9 EGL Approach: Making the complex simple Simplify specification and construction High-level language specifications Shields from systems complexities Easy and quick to learn Similar to traditional, procedural languages Facilitate verification Test/debug at logical level No deployment required, iterative prototype-to-production Automate generation for Java or COBOL (WDSc AE) for iSeries © 2004 IBM Corporation PAGE 10 EGL – What Is It? Rapid development using a platform-neutral high level 4GL specification language Abstractions, wizards, and tooling for lower skill requirements to take advantage of new technologies (e.g. EJBs, Java, web services, Struts, MQSeries) Migration path from VisualAge Generator's 4GL Bringing forward and enhancing the core technologies created over the last 20+ years in VisualAge Generator and CSP With significant additions and enhancements necessary for robust ebusiness Web Application development © 2004 IBM Corporation PAGE 11 EGL – Conceptual Summary SQL, WAS, CICS Bind EGL variables to page via Page Data view Server scripting in EGL MQ, Call, Web Services, … EGL Code DB2 The Outside World Websphere Studio-based 4GL (comfortable for 4GL, COBOL, RPG developers) …builds on top of Websphere Studio Tools, like Page Designer. iSeries Latest Web capabilities plus “heritage” support Simplify complex runtimes pSeries zSeries xSeries …supports Text-based UI’s for migration of existing apps EGL Deploy optimally to diverse platforms For developers who need to solve Business Problems, not Technology Problems © 2004 IBM Corporation PAGE 12 EGL Development Process Overview Model Use Rational Rose/XDE Export data model from DB Schema or UML model to EGL & DDL Optional, but useful Develop Iterative Specify business logic using high level abstractions Build web pages or text screens Target platform neutral - Shield complexity of target system Interactive test of application logic Strong Team support Generate Transform EGL logical specification into Java or COBOL Create build script for server artifacts Create class files ready to export to JAR for deployment Deploy and Run iSeries Windows zOS: CICS or Batch (IMS in follow on release) Linux, AIX (Solaris and HP in follow on release) © 2004 IBM Corporation PAGE 13 WebSphere Development Studio Current 5722-WDS customers with software subscription for V5R3 and V5R2, to upgrade use feature #: 2656 Available after GA RPG COBOL C/C++ PDM SEU SDA, RLU Unlimited Licenses iSeries iSeries JavaTM Debug JSF EGL Java generation iSeries Struts iSeries Web Web Service Trace Profiling Web Facing DB WebSphere Development Studio Client V5.1.2 © 2004 IBM Corporation PAGE 14 iSeries Projects RSE XML +CODE +VisualAge RPG App Server HATS Studio www.ibm.com/software/awdtools/iseries WDSc Advanced Edition V5.1.2 Workstation License order through Passport Advantage http://www.lotus.com/services/passport.nsf/WebDocs/Passport_Advantage_Home iSeries iSeries Java Debug JSF EGL Java generation EGL * COBOL generation iSeries * Struts 2004 IBM Corporation PAGE 15 Web Facing * Web Web Service Trace Profiling DB EJB * Test * Cases Portal * Toolkit J2EE * www.ibm.com/software/awdtools/iseries © iSeries iSeries Projects +CODE +VisualAge RPG RSE XML App Server HATS Studio Page Builder Tools enhancements Palette: Contains rich JSF controls. It can be customized with additional controls and groups. Navigator: Simplified project navigator hides complexity of J2EE artifacts. Page Templates: Page Data View: Separate out common page elements in a single template file Reflects data available for use by the page. Allows easy binding of data to UI tags/controls Quick Edit View: Attributes View: Allows scripting of client or server side events in Java or EGL. Customize the key properties of the selected component Results: Rapid UI Creation Simple binding of UI to Data Quick Server-side event scripting using Java or EGL © 2004 IBM Corporation PAGE 16 Coexistence with “Heritage Apps” • Native calls to COBOL, RPG, C, or Java from generated EGL applications via “Call” keyword Project Explorer • Text-based UI support needed for: – VisualAge Generator – Informix – Other 4GL’s Visual editor • WYSIWYG TUI builder planned – <2004/2005> Attributes © 2004 IBM Corporation PAGE 17 What Applications can be developed in EGL? Internet applications Callable Web Services Database applications Callable programs from traditional Java rich GUI clients Standalone batch applications Standalone TUI applications For iSeries, CICS (zOS), Linux, AIX, Windows Web Servers egl J2EE Transactions Servers egl Other Transactions Servers Web Services egl © 2004 IBM Corporation PAGE 18 Accelerate Application Delivery with ARAD Internal productivity benchmark for Sun PetStore reference application Hand-Coded in Java IDE 507.5 Hours WebSphere Studio and EGL 60 Hours WebSphere Studio JSF/EGL is dramatically faster than traditional development © 2004 IBM Corporation PAGE 19 EGL inter-operability = flexibility Powerful integration of EGL, RPG/CL, COBOL and Java for no-compromise solutions Maximum productivity, maximum flexibility Two-way interoperability Tools integration (Seamless workbench, Editors, Debuggers) Productivity Existing Application Frameworks Business Logic and Components EGL RPG – CL – COBOL Java/C/C++ Flexibility © 2004 IBM Corporation PAGE 20 Other Alternatives Lansa www.LANSA.com mrc www.mrc-productivity.com Business Computer Design ww.bcdsoftware.com Magic Software www.magicsoftware.com GeneXus www.genexus.com Computer Associates www.ca.com ASNA www.asna.com © 2004 IBM Corporation PAGE 21 What is the same for RPG/COBOL Developers? • Team development • Business logic – Procedural legacy language(s) replaced by EGL • SQL SQL (and RDBMS RDBMS) – If developers have used DB2 – However, if using local DB2 system, dissimilar tools and IDE • Transactions – All principles of online systems design apply – Most differences are vocabulary-based • Code Construction – If developers have used products such as CSP, IEF, IEW, TELON, APS, etc. © 2004 IBM Corporation PAGE 22 What's different but similar for RPG/COBOL Developers? • WDSc TSO/ISPF • EGL Library file Set of related copybooks (database schema) • Pages Screens – and many similar U.I. Concepts with… – CICS/BMS maps … HTML forms • EGL Program RPG/CL/COBOL program source file • EGL executable Program executable • JCL CL Pgm • Managing state – especially if developers are experienced in "conversational" C.I.C.S. programming • Almost all EGL language constructs similar … and familiar © 2004 IBM Corporation PAGE 23 COBOL EGL … Programming Similarities • • • • • • • • • • © EGL Program Legacy Source file definition Datatypes and variables similar – Slightly different syntax (actually pretty close for an iSeries programmer) Assignment/Move MoveL/MOVE/COMPUTE statement EGL Function RPG Procedure, COBOL paragraph EGL call RPG/COBOL CALL – to RPG Procedure or COBOL subprogram, passing parameters, etc. Conditional expressions – similar. Use of || && in place of OR/AND Conditional expressions – EGL while PERFORM UNTIL… – EGL for PERFORM UNTIL…VARYING EGL Redefines/Function REDEFINES clause Comments Comments – Slightly different rules Type definitions are similar extensions to Field Reference File 2004 IBM Corporation PAGE 24 What's new for RPG/COBOL Developers? • Rich, window'd IDE (WDSc) – Not if experienced using WDSc RSE – If totally "green-screen" get them to read a Redbook on WDSc before they start with EGL • EGL Artifacts - High level of abstraction in development • Other EGL and WSED aspects – Projects and administrative artifacts (Workspace, etc.) – Libraries – Debugging • Web Services and XML © 2004 IBM Corporation PAGE 25 Similar aspects of EGL and RPG • Field Reference File (RPG/DDS) *************** Beginning of data ************************** R FLDREF A** A A APARTMENT 10A A** C A CITY 30A A CUSTOMERID 9P 0 RANGE(1 1000) A** D A DIRECTIONS 255A A** E A EMAILADDR 50A A** F A FIRSTNAME 30A A** L A LASTNAME 30A A** P A PASSWORD 8A A PHONE 10A A POSTALCODE 10A A** S A STATE 2A A STREET 30A ****************** End of data ****************************** © 2004 IBM Corporation PAGE 26 • Data Items (EGL) package data; // A dataItem Apartment char(10) {displayName="Apartment"} end // C dataItem City char(30) {displayName="City"} end dataItem CustomerId int {displayName="Customer#“ range = (1, 1000)} end … // P dataItem Password char(8) {displayName="Password", displayUse=secret} end dataItem Phone char(10) {displayName="Phone"} end dataItem PostalCode char(10) {displayName="Zip Code"} end // S dataItem State char(2) {displayName="State", selectFromList = StateTable.stateAbbreviation, selectType = value} End Similar aspects of EGL and RPG • RPG is… – – – – – – – – Field Reference File Records Programs Subroutines Text UI Reports SQL or Indexed database access … • EGL is… – – – – – – – – – – – – – – – © 2004 IBM Corporation PAGE 27 Data Items Records Programs Functions Text UI Reports SQL or Indexed database access Libraries/Services Integrated Websphere Studio debugger breakpoints/watchpoints JSF-based web apps w/”Page Handlers” Portlet support Deploy to Linux and other platforms UML import Web services support … Compiling an RPG IV program compile bind CRTRPGMOD RPGIV Source Members (RPGLE) CRTSRVPGM © 2004 IBM Corporation PAGE 28 link CRTBNDRPG CRTRPGMOD RPGIV Source Members (RPGLE) ILE Service Program (*SRVPGM) ILE Modules (*MODULE) RPG IV ReUsable! compile ILE Modules (*MODULE) CRTPGM bind ILE Program (*PGM) Compiling an EGL program EGL EGL Script EGL © 2004 IBM Corporation PAGE 29 compile bind Intermediate Final ReUsable! EGL Application Artifacts Welcome.egl Welcome.jsp • Page Handler – – – – – Contain functions and data related to a .jsp “On Page Load” function Declare data structures that are available to “Seoul” Functions bound to command buttons Should be mostly “Controller Logic” Call “getCustomer” function CustomerLib.egl • Library – Multiple entry points – Put “Business Logic” here for web apps – Contain functions and data declarations • • generally related in some way Example: “Data Access Library” for Customer Table – – – SQL Record definition All basic CRUD functions Generated by Data Access Library Wizard from existing Schemas Calcs.egl Called pgm Payroll.egl PrintChecks.egl • Program – Used for single point of entry situations – TUI program, Batch program, GUI program, … © 2004 IBM Corporation PAGE 30 Called pgm Main pgm Rich Data • Data Dictionary, iSeries Field Reference file, … • Define Validations, Formatting, Display information, etc… once for Data Items – These rules apply wherever the data item surfaces (Web Page, TUI, business logic, …) – Validations are automatically run by EGL runtime and appropriate messages are displayed • Use Data Items to create Record definitions or other data structures to leverage Rich Data // Customer SQL Record Record Customer SQLRecord { tableNames=("PIZZABYIBM.CUSTOMER"), keyItems=("customerId“) } customerId CustomerId; firstName FirstName; lastName LastName; … state State; end // StoreLocation SQL Record Record Store SQLRecord … state State; end © 2004 IBM Corporation PAGE 31 DataItem CustomerId int { column=CUSTOMER_ID, range=(1, 1000), displayName="Customer Number", format= “######” } end DataItem State char(2) {displayName=“State Abbr.", format= “AA”, validatorTable=StateTable } end DataTable StateTable type matchValidTable StateAbbreviation char(3); {contents = [["NC"], ["MN"], ["TX"], ["VA "] ...]} end Data Access Add Get • “Record” abstracts access to: – – – – Replace Delete Relational data MQ messages Indexed, Relative, Serial data DL/I (v6.0) Commit EGL Record SQL MQ DL/I XML * - future Serial Indexed Relative • Common verbs for data access/unit of work management – Add, Get, Replace, Delete, Commit • I/O errors handled in a common fashion across disparate data types • Data format conversions handled automatically © 2004 IBM Corporation PAGE 32 EGL – Comments // rest of line is comment /* comment delimiters - single/multiple lines - cannot be nested */ -- SQL statement comment © 2004 IBM Corporation PAGE 33 EGL Structure Example One dimensional array of 20 elements Two dimensional array of 20 by 15 elements © 2004 IBM Corporation PAGE 34 Data Parts – DataItem – Examples © 2004 IBM Corporation PAGE 35 Logic Statements – If-Else • Selectively runs a block of code – based on result of logical expression – runs block when true – runs alternative block when false • Syntax: if (logicalExpression) EGL statements when true else EGL statements when false end • else clause is optional © 2004 IBM Corporation PAGE 36 Logic Statements – While • Selectively loops through a block of code – based on result of logical expression – while block runs when evaluated true – expression evaluated • • when while construct first entered after each execution of the while block – execution repeats until evaluated false © 2004 IBM Corporation PAGE 37 • Syntax: while (logicalExpression) EGL statements when true end • Can use to simulate For loop Logic Statements – Case – Examples Case using Matching Criteria © 2004 IBM Corporation PAGE 38 Case using Logical Evaluation EGL - Debugging • EGL source level debugger – Breakpoints, watch variables, change values, … – Extends base Eclipse debugger • Debug entire application seamlessly regardless of ultimate deployment targets – Transition from debugging JSP’s to EGL code to Java to … and back Java Classes, Configuration Files, … • Validate system correctness prior to deployment EGL Generator EGL Code // Event handler: Delivery Address button clicked Function forwardToDeliveryAddress() customer.emailAddr = emailEntered ; get customer; setSessionAttr(PizzaConst.custrKey, customer); forward to DeliveryInfo ; End … EGL Model Generation Process - Runtime: EGL Java Runtime (.jar containing common routines) Interpretive Debug Process - Development: EGL Interpreter Websphere Studio Debugger © 2004 IBM Corporation PAGE 39 Makes calls to EGL runtime from Debugger EGL Product Deliveries EGL 5.1.2 • Websphere Studio Site Developer/Application Developer (available May 21st) – – – – – – Web Applications (based on Java Server Faces) Text UI applications for distributed platforms iSeries/Java support (WDSC for iSeries) VG migration tooling Many misc enhancements Creation of EGL-based Web Services • WDSC Advanced Edition for iSeries (available July 21st) – i-series/COBOL support – 5250 TUI applications • Websphere Studio Enterprise Developer (available 3Q) – COBOL deployment to CICS and Batch • Utilities developed in collaboration with BP’s – UML to EGL import tool – <other tools> to EGL migration tool © 2004 IBM Corporation PAGE 40 Recap - EGL Benefits • Easy to learn, lowers skills barrier to e-business • Maximize existing “Business Oriented” developers • Higher productivity to deliver systems faster • Maximum flexibility • Multiple platforms and topologies • Step to Java if required • Bring legacy to e-business • Easily connect to existing resources • Quickly develop new functions on traditional platforms © 2004 IBM Corporation PAGE 41 Recap - EGL Benefits • Expand e-business developers team with traditionally skilled programmers • Tap into new valuable resources with strong business domain knowledge • Lower risk and increase project success rate • Lower costs of training • Lower Cost of development and • Deliver Projects faster and lower development costs © 2004 IBM Corporation PAGE 42 Questions © 2004 IBM Corporation PAGE 43