Advantages of EGL For I4GL Development

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  • The WebSphere tooling family includes (or will include) full support for mainframe COBOL development, Web site creation and maintenance, Web Application Development and now, character based application development. A single development environment for a company’s development effort is a very desirable thing. Standard curses library will allow much better color support (more colors, bold, reverse video, etc). Better locale and MBCS support as provided by OS vendors.
  • For c/i4gl programmers, this is a different model. Note that the primary reason for ConsoleUI is to provide an I4GL to EGL migration path, hence the focus on look and feel compatibility.
  • In I4GL menus, prompts, input, etc.. .were *statements*. In EGL, these have become objects with the openUI statement controlling the behavior. NOTE that OPENUI has its own two special events - before openUI and after openUI.
  • EGL enables an extremely simplified approach to developing business logic and access to enterprise resources. Procedural familiar language constructs can be learned quickly and used for defining business rules. EGL comes with a powerful data abstraction model that allows to define universal data validation and data attributes, which are always automatically applied for each use of the data in any application. The data abstraction model is such that a single simple statement in EGL replaces the need to code complex sets of data middleware programming stetements, both for relational databases as well as file systems. Similarly, message oriented middleware such as MQ Series can be interfaced using a similar data abstraction, reducing the need to learn messaging and queueing programming. If access to existing programs, wether local or residing on remote systems, is required, a simple EGL CALL protocol shields developers from the programming complexities of the required connectivity middleware. The EGL specification is seamlessly integrated with the JSF web development RAD facilites, so that a full end-to-end web system can be fully implemented without the need to learn any Java programming. It is clear that with EGL developers can become productive very quickly.
  • Rapid development of Web applications is enabled by the fusion and synergy between a set of Java Server Faces JSF tools and EGL. Java Server Faces is an emerging J2EE standard that defines a User Interface Component Model and a web application framework. The specification comes with a set of standard components (the typical standard widgets as you would expect to be able to create typical User Interfaces.. Buttons, text, entry fields etc) but also allows creation of additional components, and Websphere Studio delivers some powerful ones, called Faces Client Components, which enrich your applications with rich GUI like functionality with zero programming. The framework manages the entire request/response cycle automatically, applying all event handling, validations, components state and navigation. The use of JSF can really simplify the job of web application developers, but as usual, if there are no tools, no matter how powerful the JSF specification and reference implementaiton are, writing JSF compliant applications can still be laborious and error prone: you would have to manually define JSP with tags referencing the JSF components that you want in each page, you would have to manually code the event definitions and associate event handlers, you would have to manually define the validation and the navigation sequence. WebSphere Studio comes with an extremely easy to use approach to doing all these thing using an intuitive integration of JSF constructs with the Java Server Pages visual builder. The JSF tools make the binding of data from JSF pages to EGL data access and logic absolutely a snap with virtually no manual coding.
  • EGL enables an extremely simplified approach to developing business logic and access to enterprise resources. Procedural familiar language constructs can be learned quickly and used for defining business rules. EGL comes with a powerful data abstraction model that allows to define universal data validation and data attributes, which are always automatically applied for each use of the data in any application. The data abstraction model is such that a single simple statement in EGL replaces the need to code complex sets of data middleware programming stetements, both for relational databases as well as file systems. Similarly, message oriented middleware such as MQ Series can be interfaced using a similar data abstraction, reducing the need to learn messaging and queueing programming. If access to existing programs, wether local or residing on remote systems, is required, a simple EGL CALL protocol shields developers from the programming complexities of the required connectivity middleware. The EGL specification is seamlessly integrated with the JSF web development RAD facilites, so that a full end-to-end web system can be fully implemented without the need to learn any Java programming. It is clear that with EGL developers can become productive very quickly.
  • You can use this chart to show that the formal presentation is finished and to open up a Question and Answer session.

Transcript

  • 1. Advantages of EGL For I4GL Development Jin Zhang Software Development Manager, IBM Informix User Forum 2005 Moving Forward With Informix Atlanta, Georgia December 8-9, 2005
  • 2. Agenda
    • Business Problem, Solution
    • Application Development With EGL
    • Console User Interface
    • EGL UI Development
    • EGL Report Handling
    • EGL Language And Data Model
    • EGL and SOA
    • Moving To The Web
    • Questions
  • 3. The Informix Customer Dilemma
    • What to do with existing applications?
      • Continue to maintain = skills, tools, processes proliferation
      • Hard to reuse in new applications (Web Services)
    • Complexity: New application technology is inherently more complex
      • Many disjointed moving parts, more complex design
      • Need access to new platforms, data, connectivity
      • A more disciplined well managed approach to development is imperative
    • Skills: I4GL developers do not have the right skills to jump to the new application technology
      • Significant retraining, prohibitive costs
  • 4. The Rational Solution
    • What to do with existing applications?
      • Convert into EGL and breath new life into valuable code
        • Ready-made Java and J2EE, SOA integration
        • Can maintain using world class IDE
        • Consolidate all development activities on same single integrated workbench
    • Complexity: New applications are inherently more complex
      • Rational tools simplify development of modern applications
      • Support TUI, GUI, Web, Portals, many platforms, many databases, Messaging and Queuing, SOA etc
      • Rational platform optimized to design, develop, test and manage complex systems promoting use of software development best practices
    • Skills: I4GL developers do not have the right skills
      • EGL is easy to learn and can be mastered in a few weeks
      • No development paradigm shift required
      • Powerful , productive, and modern
  • 5.
    • Enterprise Generation Language (EGL)
      • Procedural Language for Business-Oriented Application Development
      • Familiar to procedural language developers (SQL, COBOL, RPG, 4GL)
    • Simplified programming (high abstraction polymorphic verbs)
      • Data access, transaction, session handling, middleware interaction
    • Business problem focus rather than on complex software technologies
      • Hide the details of middleware and Java/J2EE
    • Easily create applications using EGL tools bypassing the Java/J2EE/OO learning curve
      • EGL code generates to Java code or COBOL
      • Debugger for EGL source
    • Integrated with Rational Software Development Platform
      • RWD, RAD, RSA, JSF, Eclipse etc
    What is Enterprise Generation Language (EGL)?
  • 6. Why should one move to EGL?
    • Continued support of Informix 4GL type of development
    • Support for Informix IDS, DB2 and other databases
    • Support for Windows platforms
    • A single development environment:
      • supporting EGL, Java, COBOL and Web application development
      • to maintain and enhance existing TUI applications
  • 7. Why should one move to EGL?
    • Many legacy I4GL constructs can also be deployed as host (z and i-series) applications
    • Enhanced reporting capabilities
    • Future enhancements (Model driven development, GUI)
    • Mature, field-tested I4GL business logic can be used within new web applications
    • Standard “curses” library will allow much better color support in character applications
  • 8. Application development with EGL
    • EGL Program
      • Similar to an I4GL file that has the MAIN function
      • Identifies the entry point to run the application
    • EGL Library/Service
      • Similar to any other I4GL module/file that provides other functions for use
      • The functions can be accessed by other libraries/programs
      • The functions can be explicitly called using the library identifiers as a prefix
    • EGL page handler
      • Logic that contains web page handling
      • Can use functions in other libraries for business logic
  • 9. Application development with EGL
    • EGL Report Handler
      • File that contains reporting functions to be used as callbacks
    • EGL build descriptor
      • Sets up properties for generation
        • Database connections
        • User id/password
        • Project properties
      • Generates Java code based on the settings
    • EGL Resource Association
      • Attach a name to a resource
        • MQ/ File I/O etc
  • 10. Console User Interface
    • The Console UI is a set of EGL language elements and runtime libraries that provide a “curses”-style interface for EGL users to develop applications
    • The Console UI was [primarily] developed to provide a migration path from Informix I4GL to EGL
    • Provisions are made in the language to support
      • Line mode (command line) interactions
      • Display statements (in various flavors….)
      • Windows
      • Menus
      • Forms
    • Implemented to use Java Swing and Unix curses
  • 11. Console User Interface (cont…)
    • The Console UI operates (for the most part) on types and structures that have been created by EGL programmers
    • Console UI objects generate “events” which allows EGL programmers to control the runtime behavior based on user interaction
    • The Console UI runtime has been designed to
      • look the same as I4GL
      • behave the same as I4GL
    • Look-n-feel compatibility is crucial to the success of the I4GL to EGL migration effort
  • 12. EGL UI Development EGL Console UI Library Unix Curses Java Swing
  • 13. EGL UI Development
    • Some details…
      • Form layout using predefined Record type (ConsoleForm)
      • Window, Form, menu and prompt are predefined types
      • A single statement can interact with the different components
        • Statement attributes determine what action needs to be performed (input/display/construct etc)
      • Event handling to handle form, field and key events
  • 14. I4GL to EGL syntax mapping
    • Windows, Menus, Prompts, and Forms have become types in EGL
    • The EGL statement “openUI” controls the behavior of menus, prompts, and forms
    • The openUI statement can catch “events” that can be thrown by any object it can open
      • After/before field, after/before row, on key, menu Action, etc…
    • I4GL prompt, construct, menu, input, and input array become various incarnations of openUI
  • 15. EGL Report Handling
    • Capable of generating complex reports
      • Uses Jasper
      • Works with a design document
      • Can be exported to different formats (PDF, HTML, XML)
      • EGL statements to interact with reports
  • 16. Users view of EGL report runtime EGL Application EGL Report Library Jasper Report Or Jasper Design template EGL Report Handler Calls Starts Data passing Calls Report handler can call methods and use resource of EGL application
  • 17. Data Source in EGL for Jasper Jasper Report EGL Dynamic Array of Records SQL statement Connection Database EGL Report Library
  • 18. EGL Report artifacts EGL report driving program, a.egl file Jasper Report XML template, b.jrxml file EGL report handler, c.egl file EGL report driving program, a.java file EGL report driving program, b.jasper file EGL report driving program, c.java file EGL report driving program, c_lib.java file Optional Compilation
  • 19. EGL – Language Example Procedural Linear Traditional
  • 20. EGL Data Access Verbs
    • “ Record” abstracts access to:
      • Relational data
      • MQ messages
      • Indexed, Relative, Serial data
      • DL/I (v6.0)
    • 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
    SQL MQ DL/I XML Serial Indexed Relative EGL Record * - future Add Get Replace Delete Commit
  • 21. EGL Business Logic Development : Create Page Handler and Service
    • Page Handler
      • Contain functions and data related to a .jsp
      • “ On Page Load” function
      • Declare data structures that are available to “Page Designer”
      • Functions bound to command buttons
      • Should be mostly “Controller Logic”
    • Service
      • Multiple entry points
      • Put “Business Logic” in here for EGL Apps
      • Local or Remote Service Including Web Service Creation
      • Interfaces to Represent External Web Service Methods
      • Invoke server programs through a simple CALL statement From a Service
      • Contain “Black-Box” EGL functions
        • generally related in some way
        • Example: “Data Access Service”
          • SQL Record definition
          • All basic CRUD functions
    SearchGoogle.egl SearchGoogle.jsp GoogleSearch.egl Call “GoogleSearch” Service
  • 22. What Applications can be developed in EGL?
    • Internet (Web) applications – standalone, remote calls to legacy business logic …
    • Web Services – EGL Service, full Web Service, SOA
      • Create and Consume Web Services with Wizards
    • Database applications (CRUDs)
      • DB2, Oracle, VSAM, IMS, Informix, Cloudscape, sequential files…
    • Callable programs from traditional Java clients
    • Standalone batch and reporting applications
    • Standalone green-screen (TUI) applications
      • For i5oS, OS390, VSE, z/OS, Linux, AIX, Windows, Unix
  • 23. Where can EGL Applications be Deployed? RWD/RAD
    • Language
    • Editors
    • Wizards
    • Tools
    • Debugger
    • Java Generation/RT
    COBOL Generation option EGL program/library/service Used In: Code Repository WAS WAS Native (Java) Native (Java) WAS USS Linux/z Native (COBOL) CICS Batch IMS Other App Servers zSeries Windows/Linux AIX, HP, Solaris iSeries DB2 IDS Oracle IMS/DLI VSAM MQ
  • 24. EGL AND SOA
  • 25. SOA Support In EGL
    • Ability to create and consume web service artifacts
      • Simple and Intuitive Programming Model
      • Wizard Driven Development
      • Easy Testing of Generated WSDL Through Web Service Explorer
  • 26.
    • Ability to Consume External WSDL Files to Create EGL Artifacts
    • All Necessary Interfaces Generated From the WSDL File
    • Communication Protocols Automatically Created In Service Binding Library (From WSDL)
    • Complex Types Automatically Created From WSDL File Content
    • Both EGL and External Web Service Creation Possible
    SOA Support In EGL Consuming External Web Services
  • 27.
    • EGL web service has Access to All EGL Capabilities
    • WSDL file, and Necessary Classes Automatically Generated From Service
    • Menu Option on Right Click of Service Artifact Allows Creation of Service Binding Library (The Client)
    • EGL Generated Code Leverages Built In Web Service Support In Websphere Application Server
    SOA Support In EGL Creating Services With EGL
  • 28. Moving To The Web
  • 29. Rapid Development with JSF and EGL User Interface Web Services Business Logic Enterprise Information Connection Business Process Integration Control Logic
      • 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
  • 30. Rapid Development with JSF and EGL
      • 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
    User Interface Control Logic Business Logic Enterprise Information Connection Web Services Business Process Integration
  • 31. Web Site Structure and Navigation
    • Web Site Development Tool for creating, managing, and building entire web sites
      • Useful for working with a collection of web pages which make up a website
    • Key Benefits:
      • Easily visualize (and manipulate) the structure of a web site
      • Maintain a consistent look and feel of a website
    Generated Navigation Bar Detail Page Information Web Site Structure D&D to apply page template. List of available page templates with navigation controls
  • 32. Styles and Themes CSS Source view editing features, including syntax highlighting, unlimited undo and redo, content assist, element selection, and pop-up menu options. Style sheet gallery allows to select, preview and apply one of many pre-built CSS. Ability to view, edit and add new styles to the style sheet. The Preview pane shows you how the currently defined styles are likely to look when viewed in a Web browser.
      • Visual Design and Preview Capabilities
      • Support for W3C CSS Standards (CSS1, CSS2 and CSS Mobile Profile, WAP CSS 1.0)
    • Automatic design time update to pages in page designer
    • Visual and Source view synchronization
    • Import existing style sheets.
    • Design and Apply Style Sheet for Consistent Look and Feel
  • 33. Page Templates and Fragments
    • Used to easily define a consistent layout/design for a set of pages
      • Changing a template will automatically update all pages using the template
    • Two types of content:
      • Content Area: Only area which can be modified by pages based off the template
      • Page Fragments: Includes part of a page from another page (not modifiable)
    • Page Designer is used to create page templates (*.jptl)
    Page Template Designer. Design, Preview, Synchronize changes. Ready to use sample page templates (50) for rapid prototyping.
  • 34. Dynamic Page Design and Preview Construct pages by dragging and dropping rich web components from a customizable Palette Construct pages by dragging and dropping rich web components from a customizable Palette The Quick Edit View allows scripting of client or server side events in Java or Java Script. Code assist writes the code for you! Page templates separate out common page elements in a single template file Simplified Navigator hides the complexity of J2EE The Data View lets you configure and drag and drop data to automatically create a data bound UI Property views allow easy customization of the selected component
      • Rapid UI Creation
      • Integrated with EGL Records
    • Instant binding of UI to Data
    • Quick Server/Client side event scripting (with Java Server Faces)
    • Web Application Development is Drag and Drop Simple!
  • 35.  
  • 36. Advantages of EGL For I4GL Development Jin Zhang [email_address] Informix User Forum 2005 Moving Forward With Informix Atlanta, Georgia December 8-9, 2005