1 / 18

LSF - the LCU Server Framework easy creation of LCU applications with Object Oriented approach

LSF - the LCU Server Framework easy creation of LCU applications with Object Oriented approach. P. Duhoux European Southern Observatory July 2002 TSW Tutorial. ATCS - the Initiator. Large number of new sub-systems

gray-christian
Download Presentation

LSF - the LCU Server Framework easy creation of LCU applications with Object Oriented approach

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LSF - the LCU Server Frameworkeasy creation of LCU applications with Object Oriented approach P. Duhoux European Southern Observatory July 2002 TSW Tutorial

  2. ATCS - the Initiator • Large number of new sub-systems • Control of standard devices (motors, signals, serial links, monitoring and background tasks) TSW Tutorial on LSF

  3. LSF is a Framework • Fixed design and architecture • Improved code reuse thus reduced maintenance costs • Enforce VLT standards TSW Tutorial on LSF

  4. LSF is for SW Devices • SW device must support Standard Commands at ACI and API level • Behavior of standard commands is defined once • Any number of specific commands may be added TSW Tutorial on LSF

  5. LSF handles State & SubState • State machine is 100% LCC • State transitions are fully defined while additional behavior may be implemented • The concept of sub-state has been introduced that gives more precise information on the SW device status • Automatic and systematic restoration of DB configuration at Initialization • Monitoring activity allowed in any initialized state TSW Tutorial on LSF

  6. LSF supports various devices • LSF supports many types of standard devices • All device types derive from the base device • New device types can be easily added TSW Tutorial on LSF

  7. LSF imposes the SW architecture • Minimum behavior for all standard commands is provided • Additional behavior by means of user defined hooks • Table driven control • Monitoring of device state and sub-state TSW Tutorial on LSF

  8. LSF imposes the DB structure • All classes are derived from the base class lsfDB_DEVICE • A SW device is a kind of SoftDev • Specificity is achieved by sub-classing TSW Tutorial on LSF

  9. LSF database branch Run-time data Device types Device instances TSW Tutorial on LSF

  10. LSF supports Overloading • Fixed thread of control for all standard commands with several hooks for additional behavior • sub-SW devices are always handled first TSW Tutorial on LSF

  11. LSF schedules the Activities • The state and sub-state of a device are updated during the activities. • All devices of a type are processed simultaneously TSW Tutorial on LSF

  12. LSF Base Device • Minimum classes forall the devices TSW Tutorial on LSF

  13. LSF Devices • All device types are built on the same scheme • The device types are providing all minimum behavior as of the associated HW device TSW Tutorial on LSF

  14. lsftpl - the Application Template 1 • Template application used both for tests and for the creation of new applications • Fully scalable to the needs of the new application • Provides implementation examples for most of the device types TSW Tutorial on LSF

  15. <<cmm module>> lsftpl <<raw module>> app <<customized module>> app <<cmm module>> app LCU lsftpl - the Application Template 2 • The creation of a new module is based on 3 utilities: • lsfCreate: create an instance based on the template • lsfConfig: customize the module to the needs • lsfBackup: generate a DB backup file • It requires the edition of a couple of files prior to invoking lsfConfig lsfCreate app Edit some files lsfConfig app Build application Build WS & LCU environments Load on LCU Tune devices cmmArchive app lsfBackup TSW Tutorial on LSF

  16. Maintenance & Tests • Core is implemented once in lsf • standard behavior can easily be modified/improved • all lsf-based applications updated at once • Minimum tat test provided with the template • only specific tests shall be implemented TSW Tutorial on LSF

  17. LSF is a Standard • LSF has (shall) become the de-facto standard for all new LCU applications (INS excluded). • All new VLTI sub-systems are based on lsf: • ATCS • OPD, Transfer Optics (M16 and Temperature Sensors) • VCM • FINITO • Coudé • MACAO VLTI (RTC and ICS parts) • Future applications • PRIMA FSU and Metrology • SINFONI, CRIRES ??? TSW Tutorial on LSF

  18. Conclusions • LSF has now been instantiated about 30 times in various configurations in the last 18 months. • Most of the maturity problems have been solved and it shows a good level of reliability • LSF re-inforces our standards • LSF allows the designer to concentrate on the application specific issues TSW Tutorial on LSF

More Related