Program Generators and Control System Software Development

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Program Generators and Control System Software Development. Klemen Žagar ( klemen.zagar @cosylab.com ) An že Vodovnik ( anze.vodovnik@cosylab.com ) Jozef Stefan Institute, Slovenia ( http://kgb.ijs.si ) in cooperation with Cosylab Ltd., Slovenia ( http://www.cosylab.com ). Overview.
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Program Generators and Control System Software DevelopmentKlemen Žagar (klemen.zagar@cosylab.com)Anže Vodovnik (anze.vodovnik@cosylab.com)Jozef Stefan Institute, Slovenia (http://kgb.ijs.si)in cooperation withCosylab Ltd., Slovenia (http://www.cosylab.com)Overview
  • Why program generators?
  • Describing what a control system is
  • Describing how to build software for the control system
  • Demos
  • What is a program generator?
  • Generates source code
  • C++, Java, XML, XML schema (XSD, …), HTML
  • Inputs:
  • Templates with placeholders
  • Values of placeholders
  • Outputs
  • Useful code
  • Comparison with Wizards:
  • Wizards offer interactive assistance to the developer
  • Not suitable for massive use
  • Allow abundant code customization
  • Need for program generators
  • When there is a lot of repetitive code
  • When there are many artifacts that need to be kept in-sync:
  • Device driver code
  • Networking protocol
  • Configuration database schema
  • GUI
  • Many rules to follow during coding
  • Errare humanorum est
  • How program generators work?Describing what to build?
  • Control System Modeling Language (CSML) (work in progress)
  • Use of standard CASE tools
  • Notation language (UML diagrams + XML representation)
  • Properties of entities
  • Relationships
  • Documentation
  • Defining entities in a control system
  • Devices
  • Properties
  • Operations
  • Events
  • Characteristics
  • A Property
  • An observable in a control system
  • Temperature
  • Electric current
  • Data and behavior:
  • Characteristics
  • Events
  • Operations
  • Interfaces vs. classes
  • A Device
  • Models a physical device
  • Power supplies
  • Antennas
  • Motors
  • Vacuum gauge
  • May contain other devices
  • May contain properties
  • Behavior: A State MachineXML
  • Extensible Markup Language
  • World Wide Web Consortium Standard
  • XML representation of CSML model:
  • Physical representation of the model
  • CASE-tool neutral
  • Easy to manipulate using widely-available XML tools (parsers)
  • Extensible Style-sheet Language Transformations
  • Standard way to transform XML into another XML or text
  • XSL/T files are hard to maintain
  • How to build?
  • Software architects:
  • Decide on technology
  • Prescribe design patterns
  • Define classes and their relationships
  • Programmers:
  • Translate the description of the system into source code using architect’s instructions
  • In cases of high simplicity and repetition, programmers just apply templates
  • Extensible Program Generator Language (XPGL)
  • Developed at IJS and Cosylab
  • Not a standard (yet)
  • Open for influence
  • Reuses open standards wherever possible
  • XSL/T expressions and tag names, XPath, …
  • Generates code from XML documents (DOM)
  • What is XPGL?
  • XPGL is not an instance of XML
  • In XPGL, white spaces are important
  • Unnecessary verbosity of XML
  • Custom parser and transformation tool was needed (ProgGen)
  • Only one configurable escape character
  • XPGL simplifies frequently used constructs of XSL
  • XPGL allows for several named output streams
  • XPGL pays a lot of attention to spaces, so that the output can be neatly indented
  • XPGL has provisions for preserving the output manually inserted by the programmer.
  • Example: our targetclassSomeClass{privateintmyVariable;publicint getMyVariable() {returnmyVariable; }publicvoid setMyVariable(int value) { myVariable = value; }};Example: describing a class (XML)<?xml version="1.0"?><class name=”some_class”> <field type=”int” name=”my_variable”/></class>Example: the template (XPGL)<?xpgl version="1.0"?>class <”xpgl:naming('UU', /class/@name)”>{ <for-each "/class/field"> private <”@type”><”xpgl:naming('LU', @name)”>; public <”@type”> get<”xpgl:naming('UU', @name)”>() { return <”xpgl:naming('LU', @name)”>; } public void set<”xpgl:naming('UU', @name)”>(<”@type”> value) {<”xpgl:naming('LU', @name)”> = value; } </for-each>};Demos
  • Java accessor and mutator
  • Generating HTML
  • Complex example:
  • A server (“Power Supply”)
  • A GUI client
  • C#
  • Conclusion
  • The entire system is defined in one place
  • E.g., the CSML model or XML
  • Includes documentation
  • Other artifacts are kept in-sync with it
  • All other artifacts are generated
  • Generators are adjustable
  • Coding effort greatly reduced
  • Less error prone
  • Any questions?
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