File indexing completed on 2024-04-06 12:19:03
0001
0002 #include "RandomFilter.h"
0003
0004 #include "FWCore/Framework/interface/Event.h"
0005 #include "FWCore/ParameterSet/interface/ParameterSet.h"
0006 #include "FWCore/ServiceRegistry/interface/Service.h"
0007 #include "FWCore/Utilities/interface/Exception.h"
0008 #include "FWCore/Utilities/interface/RandomNumberGenerator.h"
0009 #include "FWCore/Utilities/interface/StreamID.h"
0010
0011 #include "CLHEP/Random/RandomEngine.h"
0012
0013 using namespace edm;
0014
0015 RandomFilter::RandomFilter(edm::ParameterSet const& ps) : acceptRate_(ps.getUntrackedParameter<double>("acceptRate")) {
0016 Service<RandomNumberGenerator> rng;
0017 if (!rng.isAvailable()) {
0018 throw cms::Exception("Configuration") << "RandomFilter requires the RandomNumberGeneratorService,\n"
0019 "which is not present in the configuration file. You must add\n"
0020 "the service in the configuration file or remove the modules that\n"
0021 "require it.\n";
0022 }
0023 }
0024
0025 bool RandomFilter::filter(edm::StreamID streamID, edm::Event&, edm::EventSetup const&) const {
0026 Service<RandomNumberGenerator> rng;
0027 CLHEP::HepRandomEngine& engine = rng->getEngine(streamID);
0028 if (engine.flat() < acceptRate_)
0029 return true;
0030 return false;
0031 }
