Bootstrap.cpp

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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 "GaudiKernel/ObjectFactory.h"
#include "GaudiKernel/Service.h"
#include <Gaudi/Algorithm.h>

#include "GaudiKernel/IEventProcessor.h"
#include "GaudiKernel/IJobOptionsSvc.h"

#include "RVersion.h"

namespace Gaudi {

  class BootSvcLocator : public implements<ISvcLocator> {
  public:
#if !defined( GAUDI_V22_API ) || defined( G22_NEW_SVCLOCATOR )
    StatusCode getService( const Gaudi::Utils::TypeNameString& typeName, const InterfaceID& iid,
                           IInterface*& pinterface ) override;
    StatusCode getService( const Gaudi::Utils::TypeNameString& typeName, IService*& svc,
                           const bool createIf = true ) override;
#endif
    const std::list<IService*>& getServices() const override;
    bool                        existsService( const std::string& 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;

#if !defined( GAUDI_V22_API ) || defined( G22_NEW_SVCLOCATOR )
StatusCode Gaudi::BootSvcLocator::getService( const Gaudi::Utils::TypeNameString& typeName, const InterfaceID& iid,
                                              IInterface*& pinterface ) {
  StatusCode sc = StatusCode::FAILURE;
  if ( s_appmgrInstance ) {
    sc = s_svclocInstance->getService( typeName, iid, pinterface );
  } else {
    pinterface = s_bootInterface.get();
  }
  return sc;
}
StatusCode Gaudi::BootSvcLocator::getService( const Gaudi::Utils::TypeNameString& typeName, IService*& svc,
                                              const bool createIf ) {
  StatusCode sc = StatusCode::FAILURE;
  if ( s_appmgrInstance ) {
    sc = s_svclocInstance->getService( typeName, svc, createIf );
  } else {
    svc = s_bootService.get();
  }
  return sc;
}
#endif

const std::list<IService*>& Gaudi::BootSvcLocator::getServices() const {
  return s_appmgrInstance ? s_svclocInstance->getServices() : s_bootServices;
}
bool Gaudi::BootSvcLocator::existsService( const std::string& 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;
}