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#ifndef FWCore_Services_ExternalRandomNumberGeneratorService_h
#define FWCore_Services_ExternalRandomNumberGeneratorService_h
/** \class edm::ExternalRandomNumberGenerator
Description: Interface for obtaining random number engines.
Usage:
*/
#include <cstdint>
#include <iosfwd>
#include <memory>
#include <vector>
#include "FWCore/AbstractServices/interface/RandomNumberGenerator.h"
namespace edm {
class ExternalRandomNumberGeneratorService : public RandomNumberGenerator {
public:
ExternalRandomNumberGeneratorService();
ExternalRandomNumberGeneratorService(ExternalRandomNumberGeneratorService const&) = delete;
ExternalRandomNumberGeneratorService const& operator=(ExternalRandomNumberGeneratorService const&) = delete;
void setState(std::vector<unsigned long> const&, long seed);
std::vector<unsigned long> getState() const;
CLHEP::HepRandomEngine& getEngine(StreamID const&) final;
CLHEP::HepRandomEngine& getEngine(LuminosityBlockIndex const&) final;
std::unique_ptr<CLHEP::HepRandomEngine> cloneEngine(LuminosityBlockIndex const&) final;
std::uint32_t mySeed() const final;
// The following functions should not be used by general users. They
// should only be called by Framework code designed to work with the
// service while it is saving the engine states or restoring them.
// The first two are called by the EventProcessor at special times.
// The next two are called by a dedicated producer module (RandomEngineStateProducer).
void preBeginLumi(LuminosityBlock const& lumi) final;
void postEventRead(Event const& event) final;
void setLumiCache(LuminosityBlockIndex, std::vector<RandomEngineState> const& iStates) final;
void setEventCache(StreamID, std::vector<RandomEngineState> const& iStates) final;
std::vector<RandomEngineState> const& getEventCache(StreamID const&) const final;
std::vector<RandomEngineState> const& getLumiCache(LuminosityBlockIndex const&) const final;
void consumes(ConsumesCollector&& iC) const final;
/// For debugging purposes only.
void print(std::ostream& os) const final;
private:
std::unique_ptr<CLHEP::HepRandomEngine> createFromState(std::vector<unsigned long> const&, long seed) const;
std::unique_ptr<CLHEP::HepRandomEngine> engine_;
};
} // namespace edm
#endif
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