| # Gaudi Framework, version v22r2 |

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# ServiceManager Class Reference

The ServiceManager class is in charge of the creation of concrete instances of Services. More...

`#include <ServiceManager.h>`

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List of all members.

## Classes
struct | ServiceItem
## Public Types
typedef std::list< ServiceItem > | ListSvc
typedef GaudiUtils::Map < std::string, std::string > | MapType
## Public Member Functions
| ServiceManager (IInterface *application)
| default creator
SmartIF< ISvcLocator > & | serviceLocator () const
| Function needed by CommonMessaging.
virtual | ~ServiceManager ()
| virtual destructor
virtual const std::list < IService * > & | getServices () const
| Return the list of Services.
virtual bool | existsService (const std::string &name) const
| implementation of ISvcLocation::existsService
virtual StatusCode | addService (IService *svc, int prio=10)
| implementation of ISvcManager::addService
virtual StatusCode | addService (const Gaudi::Utils::TypeNameString &typeName, int prio=10)
| implementation of ISvcManager::addService
virtual StatusCode | removeService (IService *svc)
| implementation of ISvcManager::removeService
virtual StatusCode | removeService (const std::string &name)
| implementation of ISvcManager::removeService
virtual StatusCode | declareSvcType (const std::string &svcname, const std::string &svctype)
| implementation of ISvcManager::declareSvcType
virtual SmartIF< IService > & | createService (const Gaudi::Utils::TypeNameString &nametype)
| implementation of ISvcManager::createService
virtual StatusCode | initialize ()
| Initialization (from CONFIGURED to INITIALIZED).
virtual StatusCode | start ()
| Start (from INITIALIZED to RUNNING).
virtual StatusCode | stop ()
| Stop (from RUNNING to INITIALIZED).
virtual StatusCode | finalize ()
| Finalize (from INITIALIZED to CONFIGURED).
virtual StatusCode | reinitialize ()
| Initialization (from INITIALIZED or RUNNING to INITIALIZED, via CONFIGURED).
virtual StatusCode | restart ()
| Initialization (from RUNNING to RUNNING, via INITIALIZED).
virtual int | getPriority (const std::string &name) const
| manage priorities of services
virtual StatusCode | setPriority (const std::string &name, int pri)
virtual bool | loopCheckEnabled () const
| Get the value of the initialization loop check flag.
virtual void | setLoopCheckEnabled (bool en)
| Set the value of the initialization loop check flag.
const std::string & | name () const
| Return the name of the manager (implementation of INamedInterface)
virtual SmartIF< IService > & | service (const Gaudi::Utils::TypeNameString &typeName, const bool createIf=true)
| Returns a smart pointer to a service.
## Private Member Functions
ListSvc::iterator | find (const std::string &name)
ListSvc::const_iterator | find (const std::string &name) const
ListSvc::iterator | find (const IService *ptr)
ListSvc::const_iterator | find (const IService *ptr) const
## Private Attributes
ListSvc | m_listsvc
| List of service maintained by ServiceManager.
MapType | m_maptype
| Map of service name and service type.
bool | m_loopCheck
| Check for service initialization loops.
SmartIF< IService > | m_appSvc
| Pointer to the application IService interface.
std::list< IService * > | m_listOfPtrs
| List of pointers to the know services used to implement getServices()
GaudiUtils::Map< InterfaceID, SmartIF< IInterface > > | m_defaultImplementations

## Detailed Description

The ServiceManager class is in charge of the creation of concrete instances of Services.

The ApplicationMgr delegates the creation and bookkeeping of services to the ServiceManager. In order to be able to create services from which it is not know the concrete type it requires that the services has been declared in one of 3 possible ways: an abstract static creator function, a dynamic link library or an abstract factory reference.

Author:
  Pere Mato

Definition at line 36 of file ServiceManager.h.

## Member Typedef Documentation

typedef std::list<ServiceItem> ServiceManager::ListSvc

Definition at line 57 of file ServiceManager.h.

typedef GaudiUtils::Map<std::string, std::string> ServiceManager::MapType

Definition at line 58 of file ServiceManager.h.

## Constructor & Destructor Documentation

ServiceManager::ServiceManager | ( | IInterface * | application ) |

default creator

Definition at line 22 of file ServiceManager.cpp.

                                                         :
      base_class(application, IService::interfaceID()),
      m_loopCheck(true),
      m_appSvc(application)
    {
      // Set the service locator to myself
      m_svcLocator = static_cast<ISvcLocator*>(this);

      addRef(); // Initial count set to 1
    }

ServiceManager::~ServiceManager | ( | ) | `[virtual]`

virtual destructor

Definition at line 34 of file ServiceManager.cpp.

                                    {
      //-- inform the orphan services that I am gone....
      for (ListSvc::iterator it = m_listsvc.begin(); it != m_listsvc.end(); it++ ) {
        it->service->setServiceManager(0);
      }
    }

## Member Function Documentation

StatusCode ServiceManager::addService | ( | IService * | svc,
|  | int | prio = `10`
| ) |  | `[virtual]`

implementation of ISvcManager::addService

Definition at line 93 of file ServiceManager.cpp.

    {
      ListSvc::iterator it = find(svc);
      if (it != m_listsvc.end()) {
        it->priority = prio; // if the service is already known, it is equivalent to a setPriority
        it->active = true;   // and make it active
      } else {
        m_listsvc.push_back(ServiceItem(svc,prio,true));
      }
      return StatusCode::SUCCESS;
    }

StatusCode ServiceManager::addService | ( | const Gaudi::Utils::TypeNameString & | typeName,
|  | int | prio = `10`
| ) |  | `[virtual]`

implementation of ISvcManager::addService

Definition at line 108 of file ServiceManager.cpp.

    {
      ListSvc::iterator it = find(typeName.name()); // try to find the service by name
      if (it == m_listsvc.end()) { // not found
        // If the service does not exist, we create it
        SmartIF<IService> &svc = createService(typeName);
        if (svc.isValid()) {
          StatusCode sc = StatusCode(StatusCode::SUCCESS, true);
          if (targetFSMState() >= Gaudi::StateMachine::INITIALIZED) {
            sc = svc->sysInitialize();
            if (sc.isSuccess() && targetFSMState() >= Gaudi::StateMachine::RUNNING) {
              sc = svc->sysStart();
            }
          }
          it = find(svc.get()); // now it is in the list because createService added it
          if(sc.isFailure()) { // if initialization failed, remove it from the list
            error() << "Unable to initialize service \"" << typeName.name() << "\""
                    << endmsg;
            m_listsvc.erase(it);
            // Note: removing it from the list + the SmartIF going out of scope should trigger the delete
            // delete svc.get();
            return sc;
          } else { // initialization successful, we can work with the service
            // Move the just initialized service to the back of the list
            // (we care more about order of initialization than of creation)
            m_listsvc.push_back(*it);
            m_listsvc.erase(it);
            it = --m_listsvc.end(); // last entry (the iterator was invalidated by erase)
          }
        } else {
          return StatusCode::FAILURE;
        }
      }
      // 'it' is defined because either we found the service or we created it
      // Now we can activate the service
      it->priority = prio; // if the service is already known, it is equivalent to a setPriority
      it->active = true;   // and make it active
      return StatusCode(StatusCode::SUCCESS, true);
    }

SmartIF< IService > & ServiceManager::createService | ( | const Gaudi::Utils::TypeNameString & | nametype ) | `[virtual]`

implementation of ISvcManager::createService

: check how this hack works

: what does this mean?

Definition at line 43 of file ServiceManager.cpp.

    {
      // Check if the service is already existing
      if(existsService(typeName.name())) {
        // return an error because a service with that name already exists
        return no_service;
      }

      StatusCode rc = StatusCode::FAILURE;
      rc.setChecked(); //hack to avoid going into infinite recursion on ~StatusCode

      const std::string &name = typeName.name();
      std::string type = typeName.type();
      if (!typeName.haveType()) { // the type is not explicit
        // see we have some specific type mapping for the name
        MapType::iterator it = m_maptype.find(typeName.name());
        if( it != m_maptype.end() ) {
          type = (*it).second; // use the declared type
        }
      }

      std::string::size_type ip;
      if ( (ip = type.find("__")) != std::string::npos) {
        type.erase(ip,type.length());
      }

      IService* service = PluginService::Create<IService*>(type, name, static_cast<ISvcLocator*>(this)); // serviceLocator().get());
      if ( !service ) {
        service = PluginService::CreateWithId<IService*>(type, name, static_cast<ISvcLocator*>(this)); // serviceLocator().get());
      }

      if ( service ) {
        m_listsvc.push_back(service);
        // Check the compatibility of the version of the interface obtained
        if( !isValidInterface(service) ) {
          fatal() << "Incompatible interface IService version for " << type << endmsg;
          return no_service;
        }
        service->setServiceManager(this);
        return m_listsvc.back().service;
      }
      fatal() << "No Service factory for " << type << " available." << endmsg;
      return no_service;
    }

StatusCode ServiceManager::declareSvcType | ( | const std::string & | svcname,
|  | const std::string & | svctype
| ) |  | `[virtual]`

implementation of ISvcManager::declareSvcType

Definition at line 225 of file ServiceManager.cpp.

    {
      std::pair<MapType::iterator, bool> p = m_maptype.insert(std::make_pair(svcname, svctype));
      if( p.second == false) {
        m_maptype.erase ( p.first );
        p = m_maptype.insert(std::make_pair(svcname, svctype) );
        if( p.second == false) return StatusCode::FAILURE;
      }
      return StatusCode::SUCCESS;
    }

bool ServiceManager::existsService | ( | const std::string & | name ) | const`[virtual]`

implementation of ISvcLocation::existsService

Definition at line 194 of file ServiceManager.cpp.

    {
      return find(name) != m_listsvc.end();
    }

StatusCode ServiceManager::finalize | ( | void | ) | `[virtual]`

Finalize (from INITIALIZED to CONFIGURED).

Reimplemented from ComponentManager.

Definition at line 393 of file ServiceManager.cpp.

    {
      // make sure that HistogramDataSvc and THistSvc get finalized after the
      // ToolSvc, and StatusCodeSvc after that
      int pri_tool = getPriority("ToolSvc");
      if (pri_tool != 0) {
        setPriority("THistSvc",pri_tool-1).ignore();
        setPriority("ChronoStatSvc",pri_tool-2).ignore();
        setPriority("AuditorSvc",pri_tool-3).ignore();
        setPriority("NTupleSvc",pri_tool-1).ignore();
        setPriority("HistogramDataSvc",pri_tool-1).ignore();
        // Preserve the relative ordering between HistogramDataSvc and HistogramPersistencySvc
        setPriority("HistogramPersistencySvc",pri_tool-2).ignore();
      }

      // make sure the StatusCodeSvc gets finalized really late:
      setPriority("StatusCodeSvc",-9999).ignore();

      m_listsvc.sort(); // ensure that the list is ordered by priority
      // we work on a copy to avoid to operate twice on the services created on demand
      // (which are already in the correct state).
      ListSvc tmpList(m_listsvc);

      StatusCode sc(StatusCode::SUCCESS, true);
      // call finalize() for all services in reverse order
      ListSvc::reverse_iterator rit;
      for (rit = tmpList.rbegin(); rit != tmpList.rend(); ++rit ) {
        if (!rit->active) continue; // only act on active services
        const std::string& name = rit->service->name();
        // ignore the current state for the moment
        // if( Gaudi::StateMachine::INITIALIZED == rit->service->state() ) {
        debug() << "Finalizing service " << name << endmsg;
        if ( !(rit->service->sysFinalize()).isSuccess() ) {
          warning() << "Finalization of service " << name << " failed" << endmsg;
          sc = StatusCode::FAILURE;
        }
      }
      debug() << "Service reference count check:" << endmsg;
      ListSvc::iterator it;
      while (!tmpList.empty()) {
        it = tmpList.begin();
        const std::string& name = it->service->name();
        const unsigned long rc = it->service->refCount() - 1; // exclude the count due to the temporary list
        debug() << "---- " << name
                << " (refCount = " << rc << ")" << endmsg;
        if (rc < 1) {
          warning() << "Too low reference count for " << name
                    << " (should not go below 1 at this point)" << endmsg;
          it->service->addRef();
        }
        tmpList.pop_front();
      }

      // loop over all Active Services, removing them one by one.
      // They should be deleted because the reference counting goes to 0.
      it = m_listsvc.begin();
      while (it != m_listsvc.end()) {
        if (it->active) {
          it = m_listsvc.erase(it);
        } else {
          ++it;
        }
      }
      return sc ;
    }

ListSvc::const_iterator ServiceManager::find | ( | const std::string & | name ) | const`[inline, private]`

Definition at line 134 of file ServiceManager.h.

                                                                     {
        return std::find(m_listsvc.begin(), m_listsvc.end(), name);
      }

ListSvc::iterator ServiceManager::find | ( | const std::string & | name ) | `[inline, private]`

Definition at line 131 of file ServiceManager.h.

                                                         {
        return std::find(m_listsvc.begin(), m_listsvc.end(), name);
      }

ListSvc::iterator ServiceManager::find | ( | const IService * | ptr ) | `[inline, private]`

Definition at line 137 of file ServiceManager.h.

                                                       {
        return std::find(m_listsvc.begin(), m_listsvc.end(), ptr);
      }

ListSvc::const_iterator ServiceManager::find | ( | const IService * | ptr ) | const`[inline, private]`

Definition at line 140 of file ServiceManager.h.

                                                                   {
        return std::find(m_listsvc.begin(), m_listsvc.end(), ptr);
      }

int ServiceManager::getPriority | ( | const std::string & | name ) | const`[virtual]`

manage priorities of services

Definition at line 463 of file ServiceManager.cpp.

                                                           {
    //------------------------------------------------------------------------------
      ListSvc::const_iterator it = find(name);
      return (it != m_listsvc.end()) ? it->priority: 0;
    }

const std::list< IService * > & ServiceManager::getServices | ( | ) | const`[virtual]`

Return the list of Services.

Definition at line 183 of file ServiceManager.cpp.

    {
      m_listOfPtrs.clear();
      for (ListSvc::const_iterator it = m_listsvc.begin(); it != m_listsvc.end(); ++it) {
        m_listOfPtrs.push_back(const_cast<IService*>(it->service.get()));
      }
      return m_listOfPtrs;
    }

StatusCode ServiceManager::initialize | ( | ) | `[virtual]`

Initialization (from CONFIGURED to INITIALIZED).

Reimplemented from ComponentManager.

Definition at line 239 of file ServiceManager.cpp.

    {
      m_listsvc.sort(); // ensure that the list is ordered by priority
      // we work on a copy to avoid to operate twice on the services created on demand
      // (which are already in the correct state.
      ListSvc tmpList(m_listsvc);

      StatusCode sc(StatusCode::SUCCESS, true);
      // call initialize() for all services
      for (ListSvc::iterator it = tmpList.begin(); it != tmpList.end(); ++it ) {
        if (!it->active) continue; // only act on active services
        const std::string& name = it->service->name();
        switch (it->service->FSMState()) {
        case Gaudi::StateMachine::INITIALIZED:
          debug() << "Service " << name << " already initialized" << endmsg;
          break;
        case Gaudi::StateMachine::OFFLINE:
          debug() << "Initializing service " << name << endmsg;
          sc = it->service->sysInitialize();
          if( !sc.isSuccess() ) {
            error() << "Unable to initialize Service: " << name << endmsg;
            return sc;
          } break;
        default:
          error() << "Service " << name
              << " not in the correct state to be initialized ("
              << it->service->FSMState() << ")" << endmsg;
          return StatusCode::FAILURE;
        }
      }
      return StatusCode::SUCCESS;
    }

bool ServiceManager::loopCheckEnabled | ( | ) | const`[virtual]`

Get the value of the initialization loop check flag.

Definition at line 484 of file ServiceManager.cpp.

                                                {
      return m_loopCheck;
    }

const std::string& ServiceManager::name | ( | ) | const`[inline, virtual]`

Return the name of the manager (implementation of INamedInterface)

Implements CommonMessaging< implements1< IComponentManager > >.

Definition at line 116 of file ServiceManager.h.

                                    {
        static std::string _name = "ServiceManager";
        return _name;
      }

StatusCode ServiceManager::reinitialize | ( | ) | `[virtual]`

Initialization (from INITIALIZED or RUNNING to INITIALIZED, via CONFIGURED).

Reimplemented from ComponentManager.

Definition at line 347 of file ServiceManager.cpp.

    {
      m_listsvc.sort(); // ensure that the list is ordered by priority
      // we work on a copy to avoid to operate twice on the services created on demand
      // (which are already in the correct state.
      ListSvc tmpList(m_listsvc);

      StatusCode sc(StatusCode::SUCCESS, true);
      ListSvc::iterator it;
      // Re-Initialize all services
      for ( it = tmpList.begin(); it != tmpList.end(); ++it ) {
        if (!it->active) continue; // only act on active services
        sc = it->service->sysReinitialize();
        if( !sc.isSuccess() ) {
          error() << "Unable to re-initialize Service: " << it->service->name() << endmsg;
          return StatusCode::FAILURE;
        }
      }
      return StatusCode::SUCCESS;
    }

StatusCode ServiceManager::removeService | ( | IService * | svc ) | `[virtual]`

implementation of ISvcManager::removeService

Definition at line 201 of file ServiceManager.cpp.

    {
      ListSvc::iterator it = find(svc);
      if (it != m_listsvc.end()) {
        m_listsvc.erase(it);
        return StatusCode(StatusCode::SUCCESS,true);
      }
      return StatusCode(StatusCode::FAILURE,true);
    }

StatusCode ServiceManager::removeService | ( | const std::string & | name ) | `[virtual]`

implementation of ISvcManager::removeService

Definition at line 213 of file ServiceManager.cpp.

    {
      ListSvc::iterator it = find(name);
      if (it != m_listsvc.end()) {
        m_listsvc.erase(it);
        return StatusCode::SUCCESS;
      }
      return StatusCode::FAILURE;
    }

StatusCode ServiceManager::restart | ( | ) | `[virtual]`

Initialization (from RUNNING to RUNNING, via INITIALIZED).

Reimplemented from ComponentManager.

Definition at line 370 of file ServiceManager.cpp.

    {
      m_listsvc.sort(); // ensure that the list is ordered by priority
      // we work on a copy to avoid to operate twice on the services created on demand
      // (which are already in the correct state.
      ListSvc tmpList(m_listsvc);

      StatusCode sc(StatusCode::SUCCESS, true);
      ListSvc::iterator it;
      // Re-Start all services
      for ( it = tmpList.begin(); it != tmpList.end(); ++it ) {
        if (!it->active) continue; // only act on active services
        sc = it->service->sysRestart();
        if( !sc.isSuccess() ) {
          error() << "Unable to re-start Service: " << it->service->name() << endmsg;
          return StatusCode::FAILURE;
        }
      }
      return StatusCode::SUCCESS;
    }

SmartIF< IService > & ServiceManager::service | ( | const Gaudi::Utils::TypeNameString & | typeName,
|  | const bool | createIf = `true`
| ) |  | `[virtual]`

Returns a smart pointer to a service.

Definition at line 151 of file ServiceManager.cpp.

                                                                                                            {
      const std::string &name = typeName.name();
      ListSvc::iterator it = find(name);

      if (it !=  m_listsvc.end()) {
        if (m_loopCheck &&
            (createIf && it->service->FSMState() == Gaudi::StateMachine::CONFIGURED)) {
          error()
              << "Initialization loop detected when creating service \"" << name
              << "\""
              << endmsg;
          return no_service;
        }
        return it->service;
      } else {
        // Service not found. The user may be interested in one of the interfaces
        // of the application manager itself
        if( name == "ApplicationMgr" ||
            name == "APPMGR" ||
            name == "" ) {
          return m_appSvc;
        } else if ( createIf ){
          //last resort: we try to create the service
          if (addService(typeName).isSuccess()){
            return find(name)->service;
          }
        }
      }
      return no_service;
    }

SmartIF<ISvcLocator>& ServiceManager::serviceLocator | ( | ) | const`[inline, virtual]`

Function needed by CommonMessaging.

Reimplemented from ComponentManager.

Definition at line 64 of file ServiceManager.h.

                                                          {
        return m_svcLocator;
      }

void ServiceManager::setLoopCheckEnabled | ( | bool | en ) | `[virtual]`

Set the value of the initialization loop check flag.

Definition at line 490 of file ServiceManager.cpp.

                                                    {
      m_loopCheck = en;
    }

StatusCode ServiceManager::setPriority | ( | const std::string & | name,
|  | int | pri
| ) |  | `[virtual]`

Definition at line 471 of file ServiceManager.cpp.

                                                               {
    //------------------------------------------------------------------------------
      ListSvc::iterator it = find(name);
      if (it != m_listsvc.end()) {
        it->priority = prio;
        return StatusCode::SUCCESS;
      }
      return StatusCode::FAILURE;
    }

StatusCode ServiceManager::start | ( | ) | `[virtual]`

Start (from INITIALIZED to RUNNING).

Reimplemented from ComponentManager.

Definition at line 274 of file ServiceManager.cpp.

    {
      m_listsvc.sort(); // ensure that the list is ordered by priority
      // we work on a copy to avoid to operate twice on the services created on demand
      // (which are already in the correct state.
      ListSvc tmpList(m_listsvc);

      StatusCode sc(StatusCode::SUCCESS, true);
      // call initialize() for all services
      for (ListSvc::iterator it = tmpList.begin(); it != tmpList.end(); ++it ) {
        if (!it->active) continue; // only act on active services
        const std::string& name = it->service->name();
        switch (it->service->FSMState()) {
        case Gaudi::StateMachine::RUNNING:
          debug() << "Service " << name
              << " already started" << endmsg;
          break;
        case Gaudi::StateMachine::INITIALIZED:
          debug() << "Starting service " << name << endmsg;
          sc = it->service->sysStart();
          if( !sc.isSuccess() ) {
            error() << "Unable to start Service: " << name << endmsg;
            return sc;
          } break;
        default:
          error() << "Service " << name
              << " not in the correct state to be started ("
              << it->service->FSMState() << ")" << endmsg;
          return StatusCode::FAILURE;
        }
      }
      return StatusCode::SUCCESS;
    }

StatusCode ServiceManager::stop | ( | ) | `[virtual]`

Stop (from RUNNING to INITIALIZED).

Reimplemented from ComponentManager.

Definition at line 311 of file ServiceManager.cpp.

    {
      m_listsvc.sort(); // ensure that the list is ordered by priority
      // we work on a copy to avoid to operate twice on the services created on demand
      // (which are already in the correct state.
      ListSvc tmpList(m_listsvc);

      StatusCode sc(StatusCode::SUCCESS, true);
      ListSvc::reverse_iterator it;
      // call stop() for all services
      for (it = tmpList.rbegin(); it != tmpList.rend(); ++it ) {
        if (!it->active) continue; // only act on active services
        const std::string& name = it->service->name();
        switch (it->service->FSMState()) {
        case Gaudi::StateMachine::INITIALIZED:
          debug() << "Service " << name << " already stopped" << endmsg;
          break;
        case Gaudi::StateMachine::RUNNING:
          debug() << "Stopping service " << name << endmsg;
          sc = it->service->sysStop();
          if( !sc.isSuccess() ) {
            error() << "Unable to stop Service: " << name << endmsg;
            return sc;
          } break;
        default:
          debug() << "Service " << name
              << " not in the correct state to be stopped ("
              << it->service->FSMState() << ")" << endmsg;
          return StatusCode::FAILURE;
        }
      }
      return StatusCode::SUCCESS;
    }

## Member Data Documentation

SmartIF<IService> ServiceManager::m_appSvc`[private]`

Pointer to the application IService interface.

Definition at line 150 of file ServiceManager.h.

GaudiUtils::Map<InterfaceID, SmartIF<IInterface> > ServiceManager::m_defaultImplementations`[private]`

Definition at line 155 of file ServiceManager.h.

std::list<IService*> ServiceManager::m_listOfPtrs`[mutable, private]`

List of pointers to the know services used to implement getServices()

Definition at line 153 of file ServiceManager.h.

ListSvc ServiceManager::m_listsvc`[private]`

List of service maintained by ServiceManager.

Definition at line 145 of file ServiceManager.h.

bool ServiceManager::m_loopCheck`[private]`

Check for service initialization loops.

Definition at line 147 of file ServiceManager.h.

MapType ServiceManager::m_maptype`[private]`

Map of service name and service type.

Definition at line 146 of file ServiceManager.h.

The documentation for this class was generated from the following files:

- /afs/.cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v22r2/GaudiSvc/src/ApplicationMgr/ServiceManager.h
- /afs/.cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v22r2/GaudiSvc/src/ApplicationMgr/ServiceManager.cpp

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