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/* Copyright 2019-2020 Neil Zaim
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#ifndef WARPX_RESAMPLING_TRIGGER_H_
#define WARPX_RESAMPLING_TRIGGER_H_
#include "Utils/Parser/IntervalsParser.H"
#include <AMReX_REAL.H>
#include <limits>
#include <string>
/**
* \brief This class is used to determine if resampling should be done at a given timestep for
* a given species. Specifically resampling is performed if the current timestep is included in
* the IntervalsParser m_resampling_intervals or if the average number of particles per cell of
* the considered species exceeds the threshold m_max_avg_ppc.
*/
class ResamplingTrigger
{
public:
/**
* \brief Default constructor of the ResamplingTrigger class.
*/
ResamplingTrigger () = default;
/**
* \brief Constructor of the ResamplingTrigger class. Reads the resampling trigger parameters
* from the input file.
*/
ResamplingTrigger (std::string species_name);
/**
* \brief A method that returns true if resampling should be done for the considered species
* at the considered timestep.
*
* @param[in] timestep the current timestep
* @param[in] global_numparts the total number of particles of the considered species
*/
bool triggered (int timestep, amrex::Real global_numparts) const;
/**
* \brief A method that initializes the member m_global_numcells. It is only called once (the
* first time triggered() is called) and is needed because warpx.boxArray(lev) is not yet
* initialized when the constructor of this class is called.
*/
void initialize_global_numcells () const;
private:
// Intervals that define predetermined timesteps at which resampling is performed for all
// species.
utils::parser::IntervalsParser m_resampling_intervals;
// Average number of particles per cell above which resampling is performed for a given species
amrex::Real m_max_avg_ppc = std::numeric_limits<amrex::Real>::max();
//Total number of simulated cells, summed over all mesh refinement levels.
mutable amrex::Real m_global_numcells = amrex::Real(0.0);
mutable bool m_initialized = false;
};
#endif //WARPX_RESAMPLING_TRIGGER_H_
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