DLLClassManager.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".                                            *
*                                                                                   *
* In applying this licence, CERN does not waive the privileges and immunities       *
* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
\***********************************************************************************/
#include "DLLClassManager.h"
#include <GaudiKernel/GaudiException.h>
#include <GaudiKernel/IAlgManager.h>
#include <GaudiKernel/IAlgorithm.h>
#include <GaudiKernel/IIncidentSvc.h>
#include <GaudiKernel/IMessageSvc.h>
#include <GaudiKernel/IService.h>
#include <GaudiKernel/ISvcLocator.h>
#include <GaudiKernel/ISvcManager.h>
#include <GaudiKernel/ModuleIncident.h>
#include <GaudiKernel/MsgStream.h>
#include <GaudiKernel/System.h>
#include <cassert>
 
DLLClassManager::DLLClassManager( IInterface* iface ) : m_svclocator( iface ), m_pOuter( iface ) {
  assert( m_svclocator.isValid() );
  addRef(); // Initial count set to 1
}
 
StatusCode DLLClassManager::loadModule( const std::string& module, bool fireIncident ) {
  // Access the message service if not yet done
  if ( !m_msgsvc ) m_msgsvc = m_svclocator;
  MsgStream log( m_msgsvc, "DllClassManager" );
 
  std::string mod = module == "" ? System::moduleNameFull() : module;
  if ( module == "NONE" ) return StatusCode::SUCCESS;
 
  void*      libHandle = nullptr;
  StatusCode status    = StatusCode::FAILURE;
  try {
    status = System::loadDynamicLib( module, &libHandle ) ? StatusCode::SUCCESS : StatusCode::FAILURE;
  } catch ( const std::exception& excpt ) {
    if ( m_msgsvc ) { log << MSG::ERROR << "Exception whilst loading " << module << " : " << excpt.what() << endmsg; }
    status = StatusCode::FAILURE;
  }
 
  if ( status.isFailure() ) {
    // DLL library not loaded
    log << MSG::ERROR << "Could not load module " << module << endmsg;
    log << MSG::ERROR << "System Error: " << System::getLastErrorString() << endmsg;
    return StatusCode::FAILURE;
  }
  // FIXME this is a hack to avoid a very early call to moduleLoad from
  // FIXME AppMgr::i_startup
  if ( fireIncident && !module.empty() ) {
    // now fire ModuleLoadedIncident
    const bool CREATEIF( true );
    auto       pIncidentSvc = m_svclocator->service<IIncidentSvc>( "IncidentSvc", CREATEIF );
    if ( !pIncidentSvc ) {
      log << MSG::FATAL << "Can not locate IncidentSvc" << endmsg;
      throw GaudiException( "Error retrieving IncidentSvc", "DLLClassManager::DLLClassManager", StatusCode::FAILURE );
    }
    pIncidentSvc->fireIncident( ModuleLoadedIncident( "DLLClassManager", module ) );
  }
 
  return StatusCode::SUCCESS;
}
 
void const* DLLClassManager::i_cast( const InterfaceID& iid ) const {
  if ( auto output = base_class::i_cast( iid ) ) return output;
  // fall back on the owner
  return m_pOuter->i_cast( iid );
}