EventGenerator.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2019-2020 CERN for the benefit of the Acts project
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.


#pragma once

#include "Acts/Definitions/Algebra.hpp"
#include "Acts/Utilities/Logger.hpp"
#include "ActsExamples/EventData/SimParticle.hpp"
#include "ActsExamples/Framework/DataHandle.hpp"
#include "ActsExamples/Framework/IReader.hpp"
#include "ActsExamples/Framework/ProcessCode.hpp"
#include "ActsExamples/Framework/RandomNumbers.hpp"

#include <cstddef>
#include <functional>
#include <memory>
#include <string>
#include <utility>
#include <vector>

namespace ActsExamples {
struct AlgorithmContext;

class EventGenerator final : public ActsExamples::IReader {
 public:

  struct MultiplicityGenerator {
    virtual ~MultiplicityGenerator() = default;
    virtual size_t operator()(RandomEngine& rng) const = 0;
  };

  struct VertexGenerator {
    virtual ~VertexGenerator() = default;
    virtual Acts::Vector4 operator()(RandomEngine& rng) const = 0;
  };

  struct ParticlesGenerator {
    virtual ~ParticlesGenerator() = default;
    virtual SimParticleContainer operator()(RandomEngine& rng) = 0;
  };

  struct Generator {
    std::shared_ptr<MultiplicityGenerator> multiplicity = nullptr;
    std::shared_ptr<VertexGenerator> vertex = nullptr;
    std::shared_ptr<ParticlesGenerator> particles = nullptr;
  };

  struct Config {
    std::string outputParticles;
    std::vector<Generator> generators;
    std::shared_ptr<const RandomNumbers> randomNumbers;
  };

  EventGenerator(const Config& cfg, Acts::Logging::Level lvl);

  std::string name() const final;
  std::pair<size_t, size_t> availableEvents() const final;
  ProcessCode read(const AlgorithmContext& ctx) final;

  const Config& config() const { return m_cfg; }

 private:
  const Acts::Logger& logger() const { return *m_logger; }

  Config m_cfg;
  std::unique_ptr<const Acts::Logger> m_logger;

  WriteDataHandle<SimParticleContainer> m_outputParticles{this,
                                                          "OutputParticles"};
};

}  // namespace ActsExamples