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LCIO A persistency framework and data model for the linear collider

Learn about LCIO's persistency framework & data model for linear colliders, including implementation, design, data models, current status, and future plans. Explore LCIO SW architecture, data formats, and interfaces in Java, C++, & Fortran.

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LCIO A persistency framework and data model for the linear collider

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  1. LCIO A persistency framework and data model for the linear collider CHEP 04, Interlaken Core Software, Wednesday 29.09.2004 Frank Gaede, DESY -IT-

  2. Outline • Introduction • Implementation/Design • Data Model • Status • Summary Frank Gaede, DESY -IT-

  3. Motivation for LCIO LCIO Persistency Framework Generator Analysis Recon- struction Simulation Java, C++, Fortran Java, C++, Fortran Geant3, Geant4 Java, C++, Fortran geometry Frank Gaede, DESY -IT-

  4. LCIO persistency framework LCIO data model contents data handling API implementation data format persistency Frank Gaede, DESY -IT-

  5. LCIO Project Overview • DESY and SLAC joined project: • provide common basis for ILC software • Requirements: • need Java, C++ and f77 (!) API • extendable data model for current and future simulation and testbeam studies • user code separated from concrete data format • easy to adapt LCIO in existing applications • no dependency on other frameworks -> keep it simple & lightweight Frank Gaede, DESY -IT-

  6. LCIO SW-Architecture generated from one source using AID compressed records, pointer retrieval JAS/AIDA root hbook Java API C++ API f77 API common API LCIO Java implementation LCIO C++ implementation *.slcio files (SIO) Frank Gaede, DESY -IT-

  7. Data Format (persistency): SIO • SIO: Simple Input Output • developed at SLAC for NLC simulation • already used in hep.lcd framework • features: • on the fly data compression  • some OO capabilities, e.g. pointers  • C++ and Java implementation available  • no direct access  -> use fast skip  Frank Gaede, DESY -IT-

  8. common Java, C++ interface: AID-tool from freehep.org define interfaces in Java-like language with C++ extensions -> generates files with Java interfaces -> generates C++ header files with pure abstract base classes Fortran interface: use C++-wrapper functions and cfortran.h one function for every class member function use integers to store pointers ! -> OO-like code in fortran Implementation details Frank Gaede, DESY -IT-

  9. LCIO Design abstract io abstract event concrete classes persistency implementation Frank Gaede, DESY -IT-

  10. Data Model I Frank Gaede, DESY -IT-

  11. Data Model II Frank Gaede, DESY -IT-

  12. Data Model III Frank Gaede, DESY -IT-

  13. Data Model IV Frank Gaede, DESY -IT-

  14. Data Model V Frank Gaede, DESY -IT-

  15. LCIO for transient data • The LCEvent can be used as container for transient data in an application, e.g. reconstruction • Application will call list of modules that read existing collections from the LCEvent and add resulting new Collections • LCIO has (Event/Run)-Listener classes that can serve as base classes for modules • easy to define an application framework based on LCIO for reconstruction and analysis: • org.lcsim (Java) , Marlin (C++) Frank Gaede, DESY -IT-

  16. LCEvent in a modular application LCEvent collection0 collection0 collection0 collection0 collection0 collection0 collection0 main MyInput2.slcio MyInput1.slcio MyInput0.slcio Module0 Module1 Module2 read and add collections … ModuleN MyOutput.slcio Outputmodule Frank Gaede, DESY -IT-

  17. LCIO status – new features • first official release v01-00 (Nov 2003) • simulation data model • new release v01-03 now: • reconstruction model (Rec.Particle,Tracks,Cluster) • user extensions (LCGenericObject) • raw data classes • support for CLHEP four vectors • transient data collections • StdHep interface • run, event and collection parameters -> store meta data describing what is in the collections Frank Gaede, DESY -IT-

  18. LCIO online documentation Frank Gaede, DESY -IT-

  19. LCIO on the web • LCIO homepage: http://lcio.desy.de • downloads and documentation • LCIO forum at: http://forum.linearcollider.org • user/developer questions and comments • discussions on new developments • LCIO bug reports at: http://bugs.freehep.org • bug report and new feature requests Frank Gaede, DESY -IT-

  20. LCIO Users • Geant4 Full simulations: • LCDG4, LCS, Mokka, Jupiter (planned) • Reconstruction: • org.lcsim, Brahms, Marlin • Fast simulation • Lelaps, Simdet • Testbeam • Calice: Ecal, Hcal PPTs • TPC prototypes • Analysis Tools • JAS3: file browser, code wizard • WIRED: generic event display (picking of LCIO objects) -> about to become de facto standard for ILC-software Frank Gaede, DESY -IT-

  21. JAS3 – LCIO plugin http://jas.freehep.org/jas3/index.html JAS3 provides native interfaces to LCIO: browser, code wizard, event display WIRED Frank Gaede, DESY -IT-

  22. LCIO is a persistency framework and data model for the linear collider DESY and SLAC joined project Provides Java, C++ and f77 API New version v01-03 released now simulation and reconstruction data model user extensions Future plans: react to user requests provide convenient methods handling of relationships handling of meta data bug fix patches Idea to develop a Java/C++ binding for LCIO -> would allow to have a mixed language reconstruction framework -> not so straight forward… Summary & Outlook Frank Gaede, DESY -IT-

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