RandomEngineGlue.cc

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#include <string>

#include <CLHEP/Random/RandomEngine.h>

#include <ThePEG/Interface/ClassDocumentation.h>
#include <ThePEG/Interface/InterfacedBase.h>
#include <ThePEG/Interface/Parameter.h>
#include <ThePEG/Utilities/ClassTraits.h>

#include <ThePEG/Repository/StandardRandom.h>

#include "GeneratorInterface/Herwig7Interface/interface/RandomEngineGlue.h"

#include "FWCore/Utilities/interface/EDMException.h"

using namespace ThePEG;

RandomEngineGlue::RandomEngineGlue() : randomEngine(nullptr) {}

RandomEngineGlue::~RandomEngineGlue() {}

void RandomEngineGlue::flush() {
  RandomGenerator::flush();
  gaussSaved = false;
}

void RandomEngineGlue::fill() {
  if (randomEngine == nullptr) {
    throw edm::Exception(edm::errors::LogicError) << "The PEG code attempted to a generate random number while\n"
                                                  << "the engine pointer was null. This might mean that the code\n"
                                                  << "was tried to generate a random number outside the event and\n"
                                                  << "beginLuminosityBlock methods, which is not allowed.\n";
  }
  nextNumber = theNumbers.begin();
  for (RndVector::iterator it = nextNumber; it != theNumbers.end(); ++it)
    *it = randomEngine->flat();
}

void RandomEngineGlue::setSeed(long seed) {
  // we ignore this, CMSSW overrides the seed from ThePEG
}

void RandomEngineGlue::doinit() noexcept(false) {
  RandomGenerator::doinit();

  std::shared_ptr<Proxy> proxy = Proxy::find(proxyID);
  if (!proxy)
    throw InitException();

  proxy->instance = this;
  randomEngine = proxy->getRandomEngine();
  flush();
}

ClassDescription<RandomEngineGlue> RandomEngineGlue::initRandomEngineGlue;

void RandomEngineGlue::Init() {
  typedef Proxy::ProxyID ProxyID;

  static ClassDocumentation<RandomEngineGlue> documentation("Interface to the CMSSW RandomNumberEngine.");
  static Parameter<RandomEngineGlue, ProxyID> interfaceProxyID(
      "ProxyID", "The ProxyID.", &RandomEngineGlue::proxyID, ProxyID(), ProxyID(), ProxyID(), false, false, false);

  interfaceProxyID.rank(11);
}