SEAL Project Overview Lorenzo Moneta/ CERN-EP ACAT03 1-5 December, 2003 KEK IX International Workshop on Advanced Computing and Analysis Techniques in Physics Research Lorenzo Moneta/ CERN-EP on behalf of the SEAL team

Outline Introduction SEAL Work Packages Description Current status Scope and motivation SEAL Work Packages Description Current status Future plans and summary ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Project motivation What is SEAL ? SEAL aims to project in LCG Application Area started last year after BluePrint RTAG recommendations common project on core tools and services SEAL: Shared Environment for Applications at LHC SEAL aims to Provide the software infrastructure, basic frameworks, libraries and tools that are common among the LHC experiments Select, integrate, develop and support foundation and utility class libraries Develop a coherent set of basic framework services to facilitate the integration of LCG and non - LCG software Do not re-invent the wheel Try to use as much as possible of existing software Develop/adapt/generalize to achieve necessary level of coherency ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Project scope Foundation Class Libraries Mathematical Library Basic types (STL, Boost,…), utility libraries, system isolation libraries, domain specific foundation libraries Mathematical Library Basic mathematical functions, linear algebra, fitting and minimization libraries Basic Framework Services Component model, reflection, plug-in management, incident (event) management, distributed computing, grid services, scripting Software Structure Basic Framework Foundation Libraries Simulation Framework Reconstruction Framework Visualization Framework Applications . . . Optional Libraries Other Frameworks ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Project Work Packages Foundation Foundation and Utility Libraries and Plug-in Manager MathLibs Math Libraries Support and Coordination Dictionary LCG Object Dictionary Framework Component Model and Basic Framework services Scripting Scripting Services Grid Grid Services Documentation Education and Documentation Not yet active ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Foundation and Utility Libraries Inventory of existing C++ utilities (http://seal.cern.ch/components.html) Recommended classes useful for LCG projects and experiments Large number from Boost (open source project) Support for Boost is provided (in contact with developers) Develop in SEAL what is missing in STL and Boost Have a set of low-level, fairly independent class libraries 200 classes originated mainly from classlib (CMS) Basic abstraction and foundation utilities classes Timing utilities Stream-oriented I/O, compression and decompression High quality, efficient, well tested and documented library Recommend best practice to LHC developers ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Plug-in Manager Plug-in Management Service in charge of managing, querying, [un]loading plug-ins Low level plug-in management (no framework constraints) Ability to create “module” libraries containing “plug-ins” Ability to instantiate concrete implementations knowing the plug-in category and the concrete type Caching information for fast loading what modules contain what kind of plug-ins exist and which categories Imported from CMS IGuana Basic concept: advanced object factory Interfaces for object instantiation and plug-in provider Dynamic loading completely orthogonal — and optional! ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Mathematical Libraries GSL (Gnu Scientific Library) evaluation Extensive comparison with NagC Validation and test suite Re-implementation of MINUIT in C++ Prototype available with Migrad and Minos Undergoing numerical and performance tests Comparison tests with Fortran version (compatibility within errors) Linear Algebra Prototype wrapper around GSL matrices. Comparison of various linear algebra packages (CLHEP, GSL, [u]CBLAS) Participation in CLHEP project Provide to experiments math and statistics libraries to be used in analysis, reconstruction and simulation. support, consultancy, etc.. ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Object Dictionary Adding “introspection/reflection” capabilities to C++ Use for persistency and interactivity (e.g. Python) Modern languages provide reflection inherently In C++ reflection is very limited (RTTI) The basic C++ concepts shall be supported e.g. inheritance, methods, data members, accessibility, templates Seal provides : Reflection Builder and Reflection (API interface) packages Dictionary generator to produce dict. source from C++ files Uses gcc-xml + Python script Dictionary for some standard packages (STL, CLHEP) Used by POOL (persistency) ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Dictionary Generator gcc-xml to parse header-files (extension to gcc ) XML file generated with dictionary information Python script to generate dictionary C++ code use an additional XML file to customize class selection Compiled and loaded at run-time to create dictionary Provide meta information about the object to the user User .xml selection file lcgdict .xml .h gccxml par ser filter + exten gendict _dict.cpp ..Dict.so make .h (Python script) .h .h Reflection Libraries Clients #include files ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Framework Services Motivation: Component model definition Allow LCG developers and users to write portable and modular code Provide abstractions for modelling software systems Component model definition Basic Components Set of “base classes” and interfaces needed to build more complex components Provide standard functionality instantiation, configuration, lifetime management, etc Users (framework developers) should model their services using these proposed base classes SEAL provide in addition a set of basic services implemented following the component model The current ideas Give to the “users” (framework developers) a number pre-defined service base classes (from simple to more complex) Developers should “model” their services using one of the proposed base classes Standard functionality (instantiation, configuration, lifetime management, etc.) should be provided by these bases classes ACAT03, 1-5 Dec. 2003 SEAL Project Overview

SEAL Component Model Hierarchy of bases classes Context Application C1 C1 C2 C1 C5 Svc1 Svc2 C1 C3 C1 C4 C1 C6 C1 C7 Svc1 C1 C7 Component Service Hierarchy of bases classes Components living in a Context Services are Components providing their local Context User classes inherit from Component or Services Plug-in functionality for free ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Basic Common Framework Services Application Service Defines the top level Context Defines initial set of Components to be loaded in the application Message Service Message composition, filtering and reporting Configuration Service Management of Component properties and loading configurations Multiple backends foreseen: Gaudi style options, .INI style, CMS style, XML, ... Other services will come later: Object Whiteboard (Transient Object repository) Dictionary Service (Loading Dictionaries in the application) ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Scripting Services Scripting needed for Interactivity, Configuration, Rapid prototyping, Integration (Component bus), etc. Main scripting language : Python GUI Python math shell PyGaudi Database EDG API XML Gaudi Frame work PyROOT Root Classes PVSS JPE Java Define guidelines for developing Python bindings : Various tools available (Boost.Python, SWIG) Recommend solutions: Boost.Python LCG Dictionary ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Scripting Packages PyLCGDict PyROOT Python extension module to the LCG dictionary Provide access to C++ libraries from Python, “for free” Automatically generates Python proxies for C++ objects using dictionary information Everyone can create binding effortlessly PyROOT Python bindings for ROOT classes access to ROOT functionality from Python Binding using the ROOT dictionary (CINT) Missing gateway ROOT -> Python ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Education/Documentation Produce documentation Reference documentation (generated with doxygen) HowTo pages for the released elements Plugin Manager, Dictionary generation, PyROOT, PyLCGDict, etc. Release notes Training material (tutorials) Help developers incorporating SEAL into the LCG projects and the experiment frameworks Python courses Hands-on introduction course to Python programming Very positive feedback received ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Software Process and QA Design Team design sessions Prototypes using Pythons Code Review No formal code reviews Coding done very often in pairs (XP style) More than one developer knowledgeable for each package Testing More than 200 SEAL unit tests based on CppUnit All are driven and run automatically by QmTest Bug reporting and tracking Savannah Portal (http://savannah.cern.ch/projects/seal) ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Future plans (1) Foundation libraries (Plug-in Manager) MathLibs: Follow Boost developments Little development planned in SEAL (hash-maps) MathLibs: Produce inventory of mathematical functions Evolve Minuit C++ into a final product Linear Algebra studies Generate dictionary library for Python and CINT Dictionary: Implementation of new reflection model Overcome some existing limitations (typedef,…) Converge to a common dictionary with CINT ? ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Future plans (2) Framework: Scripting : Grid : Documentation: Develop Whiteboard (object repository) and Dictionary service (loading of dictionary libraries on-demand) Scripting : PYLCGDict: Migrate much of functional core from C++ to Python Support more natural Python features (eg iterator protocol) PyROOT: Unify core with PyLCGDict Develop gateway ROOT -> Python Grid : New LCG project (ARDA) is starting Expect need to interface to some of the ARDA services Documentation: Produce tutorials for foundation classes, Boost, etc.. ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Summary SEAL has delivered basic foundation, utility libraries and object dictionary The main “client” have been POOL (persistency project) and PI Plug-in manager is also used in CMS Very positive feedback received for plug-in manager Currently being integrated into experiments’ frameworks of LHCB (Gaudi) and ATLAS (ATHENA) The first version of the Component Model and Framework services is available Start integrating in POOL and the LHC experiments Wait for feedback before developing more services Scripting based on Python Boost.Python and PyLCGDict recommended for Python bindings PyLCGDict is used to provide bindings for classes of Physics Interfaces (PI) project ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Conclusions http://seal.cern.ch/ Acknowledgments: Seal team members: R. Chytracek, J. Generowicz, W. Lavrijsen, M. Marino, P. Mato, S. Roiser, L. Tuura, M. Winkler ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Additional Slides ACAT03, 1-5 Dec. 2003 SEAL Project Overview

LCG Application Domain Coverage ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Plug-in Manager Design Originated from CMS Iguana Module Library PluginManager PluginFactoryBase PluginFactory T PluginInfo XXXFactory XXXInfo Module ModuleDef ModuleBase MyModuleDef * PluginCache Client ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Reflection System Reflection Builder: the loading interface Reflection : the user API PropertyList Item Method Field ItemBuilder MethodBuilder FieldBuilder ClassBuilder NamespaceBuilder Reflection ReflectionBuilder Class Namespace ACAT03, 1-5 Dec. 2003 SEAL Project Overview

LCG Object Dictionary: Usage . adl .h .xml Population ROOTCINT GCC - XML ADL/GOD CINT generated Dict generating code code in Conversion (1) LCG Other Clients: (python, GUI, etc.) CINT LCG to CINT Dict gateway Dictionary Streamer Dict ROOT I/O (2) out Reflection ACAT03, 1-5 Dec. 2003 SEAL Project Overview

Seal Component Model Hierarchy of bases classes Each Component lives in a Context Contexts form their own hierarchy Support for component look-up A Service provides its own local Context Components of a Service live in the scope defined by its own Context User classes inherit from Component or Service Plug-in functionality for free Component Factory Component Loader Component * 1 Service 1 Context * MyComponent MyService ACAT03, 1-5 Dec. 2003 SEAL Project Overview