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# RndmGenSvc.cpp

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    00001 //====================================================================
    00002 //      Random Generator service implementation
    00003 //--------------------------------------------------------------------
    00004 //
    00005 //      Package    : Gaudi/RndmGen ( The LHCb Offline System)
    00006 //      Author     : M.Frank
    00007 //  History    :
    00008 // +---------+----------------------------------------------+---------
    00009 // |    Date |                 Comment                      | Who
    00010 // +---------+----------------------------------------------+---------
    00011 // | 29/10/99| Initial version                              | MF
    00012 // +---------+----------------------------------------------+---------
    00013 //
    00014 //====================================================================
    00015 #define GAUDI_RANDOMGENSVC_RNDMGENSVC_CPP
    00016
    00017 // STL include files
    00018 #include <cfloat>
    00019
    00020 // Framework include files
    00021 #include "GaudiKernel/SmartIF.h"
    00022 #include "GaudiKernel/SvcFactory.h"
    00023 #include "GaudiKernel/ISvcManager.h"
    00024 #include "GaudiKernel/IRndmEngine.h"
    00025
    00026 #include "GaudiKernel/MsgStream.h"
    00027
    00028 #include "RndmGen.h"
    00029 #include "RndmGenSvc.h"
    00030
    00031 using ROOT::Reflex::PluginService;
    00032
    00033 // Instantiation of a static factory class used by clients to create
    00034 // instances of this service
    00035 DECLARE_SERVICE_FACTORY(RndmGenSvc)
    00036
    00037
    00038 RndmGenSvc::RndmGenSvc(const std::string& nam, ISvcLocator* svc)
    00039 : Service(nam, svc), m_engine(0), m_serialize(0)
    00040 {
    00041   declareProperty("Engine", m_engineName = "HepRndm::Engine<CLHEP::RanluxEngine>");
    00042 }
    00043
    00045 RndmGenSvc::~RndmGenSvc()   {
    00046 }
    00047
    00049 StatusCode RndmGenSvc::queryInterface(const InterfaceID& riid, void** ppvInterface)  {
    00050   if ( IID_IRndmGenSvc == riid )   {
    00051     *ppvInterface = (IRndmGenSvc*)this;
    00052   }
    00053   else if ( IID_IRndmEngine == riid )   {
    00054     *ppvInterface = (IRndmEngine*)this;
    00055   }
    00056   else if ( IID_ISerialize == riid )   {
    00057     *ppvInterface = (ISerialize*)this;
    00058   }
    00059   else  {
    00060     return Service::queryInterface(riid, ppvInterface);
    00061   }
    00062   addRef();
    00063   return StatusCode::SUCCESS;
    00064 }
    00065
    00067 StatusCode RndmGenSvc::initialize()   {
    00068   StatusCode status = Service::initialize();
    00069   MsgStream log(msgSvc(), name());
    00070   std::string machName = name()+".Engine";
    00071   SmartIF<IRndmEngine> engine(IID_IRndmEngine);
    00072   SmartIF<ISvcManager> mgr(IID_ISvcManager, serviceLocator());
    00073
    00074   if ( status.isSuccess() )   {
    00075     status = setProperties();
    00076     if ( status.isSuccess() )   {  // Check if the Engine service exists:
    00077       // FIXME: (MCl) why RndmGenSvc cannot create the engine service in a standard way?
    00078       status = serviceLocator()->getService(machName, IID_IRndmEngine, (IInterface*&)engine.pRef());
    00079       if ( !status.isSuccess() && mgr.isValid( ) )   {
    00080         IService* service = 0;
    00081         // Engine does not exist: We have to create one!
    00082         status = mgr->createService(m_engineName,machName,service);
    00083         if (status.isSuccess()) {
    00084           engine = service;
    00085           service->release();
    00086         }
    00087       }
    00088       if ( status.isSuccess() )   {
    00089         SmartIF<ISerialize> serial(IID_ISerialize, engine);
    00090         SmartIF<IService>   service(IID_IService,  engine);
    00091         if ( serial.isValid( ) && service.isValid( ) )  {
    00092           status = service->sysInitialize();
    00093           if ( status.isSuccess() )   {
    00094             m_engine = engine;
    00095             m_serialize = serial;
    00096             m_engine->addRef();
    00097             m_serialize->addRef();
    00098             log << MSG::INFO << "Using Random engine:" << m_engineName << endreq;
    00099             return status;
    00100           }
    00101         }
    00102       }
    00103     }
    00104   }
    00105   return status;
    00106 }
    00107
    00109 StatusCode RndmGenSvc::finalize()   {
    00110   StatusCode status = Service::finalize();
    00111   if ( m_serialize ) m_serialize->release();
    00112   m_serialize = 0;
    00113   if ( m_engine ) {
    00114     SmartIF<IService> service(IID_IService, m_engine);
    00115     service->finalize().ignore();
    00116     m_engine->release();
    00117   }
    00118   m_engine = 0;
    00119   return status;
    00120 }
    00121
    00123
    00124 StreamBuffer& RndmGenSvc::serialize(StreamBuffer& str)    {
    00125   if ( 0 != m_serialize )    {
    00126     return m_serialize->serialize(str);
    00127   }
    00128   MsgStream log(msgSvc(), name());
    00129   log << MSG::ERROR << "Cannot input serialize Generator settings!" << endreq;
    00130   return str;
    00131 }
    00132
    00134 StreamBuffer& RndmGenSvc::serialize(StreamBuffer& str) const    {
    00135   if ( 0 != m_serialize )    {
    00136     return m_serialize->serialize(str);
    00137   }
    00138   MsgStream log(msgSvc(), name());
    00139   log << MSG::ERROR << "Cannot output serialize Generator settings!" << endreq;
    00140   return str;
    00141 }
    00142
    00144 IRndmEngine* RndmGenSvc::engine()     {
    00145   return m_engine;
    00146 }
    00147
    00149 StatusCode RndmGenSvc::generator(const IRndmGen::Param& par, IRndmGen*& refpGen)   {
    00150   StatusCode status = StatusCode::FAILURE;
    00151   IInterface* iface = PluginService::CreateWithId<IInterface*>(par.type(),(IInterface*)m_engine);
    00152   if ( iface ) {
    00153     // query requested interface (adds ref count)
    00154     status = iface->queryInterface(IID_IRndmGen, (void**)& refpGen);
    00155     if ( status.isSuccess() )   {
    00156       status = refpGen->initialize(par);
    00157     }
    00158     else  {
    00159       iface->release();
    00160     }
    00161   }
    00162   // Error!
    00163   return status;
    00164 }
    00165
    00166 // Single shot returning single random number
    00167 double RndmGenSvc::rndm() const   {
    00168   if ( 0 != m_engine )    {
    00169     return m_engine->rndm();
    00170   }
    00171   return -1;
    00172 }
    00173
    00174 /*  Multiple shots returning vector with flat random numbers.
    00175     @param  array    Array containing random numbers
    00176     @param  howmany  fill 'howmany' random numbers into array
    00177     @param  start    ... starting at position start
    00178     @return StatusCode indicating failure or success.
    00179 */
    00180 StatusCode RndmGenSvc::rndmArray( std::vector<double>& array, long howmany, long start) const   {
    00181   if ( 0 != m_engine )    {
    00182     return m_engine->rndmArray(array, howmany, start);
    00183   }
    00184   return StatusCode::FAILURE;
    00185 }
    00186
    00187 // Allow to set new seeds
    00188 StatusCode RndmGenSvc::setSeeds(const std::vector<long>& seeds)   {
    00189   if ( 0 != m_engine )    {
    00190     return m_engine->setSeeds(seeds);
    00191   }
    00192   return StatusCode::FAILURE;
    00193 }
    00194
    00195 // Allow to get the seeds
    00196 StatusCode RndmGenSvc::seeds(std::vector<long>& seeds)  const  {
    00197   if ( 0 != m_engine )    {
    00198     return m_engine->seeds(seeds);
    00199   }
    00200   return StatusCode::FAILURE;
    00201 }
    00202