Bootstrap.cpp

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/***********************************************************************************\
* (c) Copyright 1998-2025 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
*                                                                                   *
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* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
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#include <iostream>
 
#include <GaudiKernel/Bootstrap.h>
#include <GaudiKernel/System.h>
 
#include <GaudiKernel/IAlgorithm.h>
#include <GaudiKernel/IAppMgrUI.h>
#include <GaudiKernel/IClassManager.h>
#include <GaudiKernel/IInterface.h>
#include <GaudiKernel/IService.h>
#include <GaudiKernel/ISvcLocator.h>
 
#include <Gaudi/Algorithm.h>
#include <GaudiKernel/ObjectFactory.h>
#include <GaudiKernel/Service.h>
 
#include <GaudiKernel/IEventProcessor.h>
 
#include <RVersion.h>
 
#include <Python.h>
 
namespace Gaudi {
 
  class BootSvcLocator : public implements<ISvcLocator> {
  public:
    const std::list<IService*>& getServices() const override;
    bool                        existsService( std::string_view name ) const override;
 
    SmartIF<IService>& service( const Gaudi::Utils::TypeNameString& typeName, const bool createIf = true ) override;
  };
} // namespace Gaudi
 
static SmartIF<ISvcLocator> s_svclocInstance;
static SmartIF<IAppMgrUI>   s_appmgrInstance;
 
//------------------------------------------------------------------------------
IAppMgrUI* Gaudi::createApplicationMgr( const std::string& dllname, const std::string& factname )
//------------------------------------------------------------------------------
{
  // Allow not for multiple AppManagers: If already instantiated then just
  // return it
  if ( !s_appmgrInstance ) {
    s_appmgrInstance = createApplicationMgrEx( dllname, factname );
    s_svclocInstance = s_appmgrInstance;
  }
  return s_appmgrInstance.get();
}
 
//------------------------------------------------------------------------------
IAppMgrUI* Gaudi::createApplicationMgrEx( const std::string& dllname, const std::string& factname )
//------------------------------------------------------------------------------
{
  // Create an instance of the application Manager
  auto iif = make_SmartIF( Gaudi::createInstance( "ApplicationMgr", factname, dllname ) );
  // Locate few interfaces of the Application Manager
  return iif ? iif.as<IAppMgrUI>().get() : nullptr;
}
 
//------------------------------------------------------------------------------
ISvcLocator* Gaudi::svcLocator()
//------------------------------------------------------------------------------
//
// A dual-stage bootstrap mechanism is used to ensure an orderly startup
// of the ApplicationMgr. If this function is called before the singleton
// ApplicationMgr instance exists, a BootSvcLocator singleton instance is
// created. This responds to any subsequent requests for services by
// returning StatusCode::FAILURE, unless the ApplicationMgr singleton
// instance has been created in the interim. In this case, the BootSvcLocator
// forwards the request to the ApplicationMgr instance. The motivation for
// this is to handle static object instances where the constructor attempts
// to locate services and would otherwise instantiate the ApplicationMgr
// instance in an unorderly manner. This logic requires that the
// ApplicationMgr instance is created explicitly.
 
{
  if ( !s_svclocInstance ) {
    IAppMgrUI* iappmgr = createApplicationMgr();
    if ( iappmgr ) {
      s_svclocInstance = iappmgr;
      if ( s_svclocInstance ) return s_svclocInstance;
    }
    //---Reverted change to create a Minimal SvcLocator in case is requested before AppMgr is created
    // if( 0 == s_appmgrInstance ) {
    //  s_svclocInstance = new BootSvcLocator();
    //} else {
    //  StatusCode sc = s_appmgrInstance->queryInterface( ISvcLocator::interfaceID(),
    //                                                  pp_cast<void>(&s_svclocInstance) );
    //  if( sc.isSuccess() ) {
    //    return s_svclocInstance;
    //  }
    //}
  }
  return s_svclocInstance;
}
 
//------------------------------------------------------------------------------
ISvcLocator* Gaudi::setInstance( ISvcLocator* newInstance )
//------------------------------------------------------------------------------
{
  ISvcLocator* oldInstance = s_svclocInstance.get();
  s_svclocInstance         = newInstance;
  s_appmgrInstance         = s_svclocInstance;
  return oldInstance;
}
 
//------------------------------------------------------------------------------
IAppMgrUI* Gaudi::setInstance( IAppMgrUI* newInstance )
//------------------------------------------------------------------------------
{
  IAppMgrUI* oldInstance = s_appmgrInstance.get();
  s_appmgrInstance       = newInstance;
  s_svclocInstance       = s_appmgrInstance;
  return oldInstance;
}
 
//------------------------------------------------------------------------------
IInterface* Gaudi::createInstance( const std::string& name, const std::string& factname, const std::string& dllname )
//------------------------------------------------------------------------------
{
 
  IInterface* ii = ObjFactory::create( factname, nullptr ).release();
  if ( ii ) return ii;
  IService* is = Service::Factory::create( factname, name, nullptr ).release();
  if ( is ) return is;
  IAlgorithm* ia = Algorithm::Factory::create( factname, name, nullptr ).release();
  if ( ia ) return ia;
 
  void* libHandle = nullptr;
  if ( System::loadDynamicLib( dllname, &libHandle ) ) {
    ii = ObjFactory::create( factname, nullptr ).release();
    if ( ii ) return ii;
    is = Service::Factory::create( factname, name, nullptr ).release();
    if ( is ) return is;
    ia = Algorithm::Factory::create( factname, name, nullptr ).release();
    if ( ia ) return ia;
  } else {
    // DLL library not loaded. Try in the local module
    std::cout << System::getLastErrorString() << std::endl;
    std::cout << "Gaudi::Bootstrap: Not found DLL " << dllname << std::endl;
  }
  return nullptr;
}
 
//------------------------------------------------------------------------------
IAppMgrUI* Gaudi::createApplicationMgr( const std::string& dllname ) {
  //------------------------------------------------------------------------------
  return createApplicationMgr( dllname, "ApplicationMgr" );
}
 
//------------------------------------------------------------------------------
IAppMgrUI* Gaudi::createApplicationMgr() {
  //------------------------------------------------------------------------------
  return createApplicationMgr( "GaudiCoreSvc", "ApplicationMgr" );
}
 
//=======================================================================
// BootSvcLocator
//=======================================================================
 
static std::list<IService*> s_bootServices;
static SmartIF<IService>    s_bootService;
static SmartIF<IInterface>  s_bootInterface;
 
using Gaudi::BootSvcLocator;
 
const std::list<IService*>& Gaudi::BootSvcLocator::getServices() const {
  return s_appmgrInstance ? s_svclocInstance->getServices() : s_bootServices;
}
bool Gaudi::BootSvcLocator::existsService( std::string_view name ) const {
  return s_appmgrInstance && s_svclocInstance->existsService( name );
}
 
SmartIF<IService>& Gaudi::BootSvcLocator::service( const Gaudi::Utils::TypeNameString& typeName, const bool createIf ) {
  return s_appmgrInstance ? s_svclocInstance->service( typeName, createIf ) : s_bootService;
}
 
#ifdef GAUDI_HASCLASSVISIBILITY
#  pragma GCC visibility push( default )
#endif
// Python bootstrap helpers
extern "C" {
#define PyHelper( x ) py_bootstrap_##x
IInterface* PyHelper( createApplicationMgr )() { return Gaudi::createApplicationMgr(); }
IInterface* PyHelper( getService )( IInterface* app, char* name ) {
  auto svcloc = SmartIF<ISvcLocator>( app );
  return svcloc ? svcloc->service<IInterface>( std::string_view{ name } ).get() : nullptr;
}
bool PyHelper( setProperty )( IInterface* p, char* name, char* value ) {
  auto prop = SmartIF<IProperty>( p );
  return prop && prop->setProperty( name, value ).isSuccess();
}
const char* PyHelper( getProperty )( IInterface* p, char* name ) {
  auto prop = SmartIF<IProperty>( p );
  if ( !prop ) return nullptr;
  // this is needed to guarantee that Python can access the returned char*
  static std::string value;
  value = prop->getProperty( name ).toString();
  return value.c_str();
}
void PyHelper( setOption )( IInterface* app, char* key, char* value ) {
  if ( auto svcloc = SmartIF<ISvcLocator>( app ) ) { svcloc->getOptsSvc().set( key, value ); }
}
bool PyHelper( configureApp )( IInterface* app ) {
  auto ui = SmartIF<IAppMgrUI>( app );
  return ui && ui->configure().isSuccess();
}
int PyHelper( ROOT_VERSION_CODE )() { return ROOT_VERSION_CODE; }
 
bool py_bootstrap_app_run( IInterface* i, int maxevt ) {
  auto ep   = SmartIF<IEventProcessor>( i );
  bool stat = false;
  // Relinquish the GIL to allow python algs in MT mode
  Py_BEGIN_ALLOW_THREADS;
  stat = ep && ep->executeRun( maxevt ).isSuccess();
  Py_END_ALLOW_THREADS;
  return stat;
}
 
#define PyFSMHelper( s )                                                                                               \
  bool py_bootstrap_fsm_##s( IInterface* i ) {                                                                         \
    auto fsm = SmartIF<IStateful>( i );                                                                                \
    return fsm && fsm->s().isSuccess();                                                                                \
  }
 
// clang-format off
PyFSMHelper( configure )
PyFSMHelper( initialize )
PyFSMHelper( start )
PyFSMHelper( stop )
PyFSMHelper( finalize )
PyFSMHelper( terminate )
// clang-format on
}
#ifdef GAUDI_HASCLASSVISIBILITY
#  pragma GCC visibility pop
#endif