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Graphical Object-Oriented Programming

Graphical Object-Oriented Programming. Jörgen Jehander - ENDEVO Stepan Riha - LabVIEW Software Engineer Thu 10:15a, 12:45p, and 3:30p Red River (4B). Overview. Problems with monolithic applications Conventional development Component-based development Using components in LabVIEW

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Graphical Object-Oriented Programming

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  1. Graphical Object-Oriented Programming Jörgen Jehander - ENDEVO Stepan Riha - LabVIEW Software Engineer Thu 10:15a, 12:45p, and 3:30p Red River (4B)

  2. Overview • Problems with monolithic applications • Conventional development • Component-based development • Using components in LabVIEW • Implementing OOP in LabVIEW

  3. Problems with Monolithic Applications • Difficulties we face: • Design can quickly become confusing • Numerous developers increase problems • Testing is not straightforward • Difficulty finding and correcting bugs • Expensive to add functionality

  4. Conventional Development • Top-down design • Functionality abstracted into subVIs • GUI often designed first • SubVIs often created from sections of virtual instruments (VI) • State information stored in global variables • Data dependencies • Race conditions

  5. Conventional Development • Case study – climate control system • Maintain a desired temperature using a heater, cooler, fan, and temperature sensor

  6. Conventional Development • Climate control system

  7. Component Program Component A Component B Component C Component D Component E Component-Based Development Monolithic Program

  8. Component-Based Development • Design begins by identifying components • Look at the problem description • Think in higher level terms • Decide on responsibility and behavior of each component • Test each component on its own • Application is built up from components • They snap together like Lego blocks • You can add new pieces in the future

  9. Component-Based Development • Case study – climate control system Controller Heater Cooler Fan Temp

  10. Component-Based Development • Climate control system

  11. Designing Components • Responsibility first • Determine component behavior • Decide on component responsibilities • Interface second • Select which functions you should use to control the component • Implementation third • Test component

  12. Using Components in LabVIEW • Queue VIs • Responsibility • Passing data between diagrams running in parallel • Using FIFO buffer for string data • Interface • Create queue • Insert queue element • Remove queue element • Destroy queue

  13. Classes, Methods, and Objects • Classes • Implementation of components • Methods • Public interface to component • Objects • Instances of class data

  14. Implementing OOP in LabVIEW • Should use the same as built-in components • No direct language support in LabVIEW • Object management implemented on diagram • Class Wizard • Automatically generates class and method VIs

  15. Implementing OOP in LabVIEW Class New Creates an object Class Delete Destroys the object Class Get Data Reads object state information (read-only) Class Get Data to Modify Class Set Modified Data Reads and writes object state information

  16. Implementing OOP in LabVIEW • Class Methods • Implemented using Get Data or Get Data to Modify and Set Modified Data VIs

  17. Class Wizard Demo

  18. Graphical Object-Oriented Programming Conclusion • GOOP and Components improve: • Reusability • Testability • Maintenance • Scaleability • Team development • GOOP is built on: • Classes, objects, and methods

  19. Questions?

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