case_factory.hpp

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#pragma once
#include <deal.II/base/exceptions.h>
#include <deal.II/base/mpi.h>
 
#include <map>
#include <memory>
#include <string>
 
template <typename CaseType>
class SimulationCaseFactory
{
public:
  using SimulationCreator =
    std::function<std::unique_ptr<CaseType>(const std::string, const MPI_Comm)>;
 
  static bool
  register_simulation(const std::string name, SimulationCreator creator)
  {
    AssertThrow(not creators.contains(name),
                dealii::ExcMessage("Requested simulation case already registered: " + name));
    creators[name] = creator;
    return true;
  }
 
  static std::unique_ptr<CaseType>
  create_simulation(const std::string name,
                    const std::string parameter_file,
                    const MPI_Comm    mpi_communicator)
  {
    auto it = creators.find(name);
    AssertThrow(it != creators.end(),
                dealii::ExcMessage(
                  "Requested simulation case not registered: " + name +
                  " Did you forget to create a *.cpp file for your simulation case, " +
                  "where you explicitly instantiate your case?"));
    return it->second(parameter_file, mpi_communicator);
  }
 
private:
  static inline std::map<std::string, SimulationCreator> creators;
};