quadrature_provider.hh

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#pragma once
 
// DiFfRG
#include <DiFfRG/common/json.hh>
#include <DiFfRG/common/quadrature/matsubara.hh>
#include <DiFfRG/common/quadrature/quadrature.hh>
 
// standard library
#include <mutex>
 
namespace DiFfRG
{
  namespace internal
  {
    class MatsubaraStorage
    {
    public:
      template <typename NT = double> MatsubaraQuadrature<NT> &get_matsubara_quadrature(const NT T, const NT E)
      {
        std::lock_guard<std::mutex> lock(m_mutex);
 
        if constexpr (std::is_same_v<NT, double>) {
          auto T_it = find_T_d(T);
          auto E_it = find_E_d(E, T_it);
          return E_it->second;
        } else if constexpr (std::is_same_v<NT, float>) {
          auto T_it = find_T_f(T);
          auto E_it = find_E_f(E, T_it);
          return E_it->second;
        }
        static_assert(std::is_same_v<NT, double> || std::is_same_v<NT, float>,
                      "Unknown type requested of MatsubaraStorage::get_matsubara_quadrature");
      }
 
      void set_verbosity(int v);
 
      void set_vacuum_quad_size(const int size);
      void set_min_matsubara_size(const int value);
      void set_max_matsubara_size(const int value);
      void set_matsubara_precision_factor(const int value);
 
    private:
      MatsubaraQuadrature<double> &get_matsubara_quadrature_d(const double T, const double E);
      MatsubaraQuadrature<float> &get_matsubara_quadrature_f(const float T, const float E);
 
      template <typename NT = double> using StorageType = std::map<double, std::map<double, MatsubaraQuadrature<NT>>>;
      template <typename NT = double> using SubStorageType = std::map<double, MatsubaraQuadrature<NT>>;
 
      template <typename NT = double> using TemperatureIterator = typename StorageType<NT>::iterator;
      template <typename NT = double> using EnergyIterator = typename StorageType<NT>::mapped_type::iterator;
 
      TemperatureIterator<double> find_T_d(const double T);
      TemperatureIterator<float> find_T_f(const float T);
 
      EnergyIterator<double> find_E_d(const double E, TemperatureIterator<double> T_it);
      EnergyIterator<float> find_E_f(const float E, TemperatureIterator<float> T_it);
 
      StorageType<double> quadratures_d;
      StorageType<float> quadratures_f;
 
      int verbosity = 0;
      int vacuum_quad_size = 64;
      int matsubara_precision_factor = 0;
      int min_matsubara_size = 32;
      int max_matsubara_size = 128;
 
      std::mutex m_mutex;
    };
 
    class QuadratureStorage
    {
    public:
      template <typename NT = double> Quadrature<NT> &get_quadrature(const size_t order, const QuadratureType type)
      {
        std::lock_guard<std::mutex> lock(m_mutex);
 
        if constexpr (std::is_same_v<NT, double>) {
          auto type_it = find_type_d(type);
          auto order_it = find_order_d(order, type_it);
          return order_it->second;
        } else if constexpr (std::is_same_v<NT, float>) {
          auto type_it = find_type_f(type);
          auto order_it = find_order_f(order, type_it);
          return order_it->second;
        }
        static_assert(std::is_same_v<NT, double> || std::is_same_v<NT, float>,
                      "Unknown type requested of QuadratureStorage::get_quadrature");
      }
 
      void set_verbosity(int v);
 
    private:
      Quadrature<double> &get_quadrature_d(const size_t order, const QuadratureType type);
      Quadrature<float> &get_quadrature_f(const size_t order, const QuadratureType type);
 
      template <typename NT = double> using StorageType = std::map<QuadratureType, std::map<size_t, Quadrature<NT>>>;
      template <typename NT = double> using SubStorageType = std::map<size_t, Quadrature<NT>>;
 
      template <typename NT = double> using TypeIterator = typename StorageType<NT>::iterator;
      template <typename NT = double> using OrderIterator = typename StorageType<NT>::mapped_type::iterator;
 
      TypeIterator<double> find_type_d(const QuadratureType type);
      TypeIterator<float> find_type_f(const QuadratureType type);
 
      OrderIterator<double> find_order_d(const size_t order, TypeIterator<double> type_it);
      OrderIterator<float> find_order_f(const size_t order, TypeIterator<float> type_it);
 
      StorageType<double> quadratures_d;
      StorageType<float> quadratures_f;
 
      int verbosity = 0;
 
      std::mutex m_mutex;
    };
  } // namespace internal
 
  class QuadratureProvider
  {
  public:
    QuadratureProvider();
    QuadratureProvider(const JSONValue &json);
 
    template <typename NT = double, typename MemorySpace = CPU_memory>
    auto nodes(const size_t order, const QuadratureType type = QuadratureType::legendre)
    {
      return quadrature_storage.get_quadrature<NT>(order, type).template nodes<MemorySpace>();
    }
 
    template <typename NT = double, typename MemorySpace = CPU_memory>
    auto weights(const size_t order, const QuadratureType type = QuadratureType::legendre)
    {
      return quadrature_storage.get_quadrature<NT>(order, type).template weights<MemorySpace>();
    }
 
    template <typename NT = double, typename MemorySpace = CPU_memory>
    auto matsubara_nodes(const NT T, const NT typical_E)
    {
      return matsubara_storage.get_matsubara_quadrature<NT>(T, typical_E).template nodes<MemorySpace>();
    }
 
    template <typename NT = double, typename MemorySpace = CPU_memory>
    auto matsubara_weights(const NT T, const NT typical_E)
    {
      return matsubara_storage.get_matsubara_quadrature<NT>(T, typical_E).template weights<MemorySpace>();
    }
 
    template <typename NT = double> NT matsubara_T(const NT T, const NT typical_E)
    {
      return matsubara_storage.get_matsubara_quadrature<NT>(T, typical_E).get_T();
    }
 
  private:
    internal::MatsubaraStorage matsubara_storage;
    internal::QuadratureStorage quadrature_storage;
 
    int verbosity;
  };
} // namespace DiFfRG