InteractionHandler.h

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// This file is part of the MercuryDPM project (https://www.mercurydpm.org).
// Copyright (c), The MercuryDPM Developers Team. All rights reserved.
// License: BSD 3-Clause License; see the LICENSE file in the root directory.
 
#ifndef INTERACTIONHANDLER_H
#define INTERACTIONHANDLER_H
 
#include <Interactions/AdhesiveForceInteractions/LiquidBridgeWilletInteraction.h>
#include <Interactions/AdhesiveForceInteractions/LiquidMigrationWilletInteraction.h>
#include <Interactions/AdhesiveForceInteractions/LiquidMigrationLSInteraction.h>
#include "BaseHandler.h"
#include "Interactions/BaseInteraction.h"
#include "File.h"
#include "MpiContainer.h"
#include <map>
 
class SpeciesHandler;
 
class InteractionHandler final : public BaseHandler<BaseInteraction>
{
public:
    InteractionHandler();
    
    InteractionHandler(const InteractionHandler& IH UNUSED);
    
    InteractionHandler& operator=(const InteractionHandler& rhs);
    
    ~InteractionHandler() override;
    
    void addObject(BaseInteraction* I) override;
 
    void read(std::istream& is);
 
    void readAndAddObject(std::istream& is) override;
    
    BaseInteraction* getExistingInteraction(const BaseInteractable* P, const BaseInteractable* I) const;
    
    BaseInteraction* addInteraction(BaseInteractable* P, BaseInteractable* I, unsigned timeStamp);
    
    /*
     * This function is used in omp simulations to add new objects to the interactionHandler during computeOneTimeStep.
     * It is step 1 of the add-by-reduction approach:
     *  1. Declare an empty vector newObjects_, one element per thread.
     *  2. When a new object needs to be added to the interactionHandler, don't add it immediately.
     *     Add it to newObjects_[threadNum] instead
     *  3. Add all objects in newObjects_ to the interactionHandler.
     * This reduction approach allows step 2 to be run in parallel, while step 3 needs to be done in sequence.
     * It is efficient, since step 3 is much quicker than step 2.
     */
    void resetNewObjectsOMP();
    
    /*
     * This function is used in omp simulations to add new objects to the interactionHandler during computeOneTimeStep.
     * It is step 3 of the add-by-reduction approach:
     *  1. Declare an empty vector newObjects_, one element per thread.
     *  2. When a new object needs to be added to the interactionHandler, don't add it immediately.
     *     Add it to newObjects_[threadNum] instead
     *  3. Add all objects in newObjects_ to the interactionHandler.
     * This reduction approach allows step 2 to be run in parallel, while step 3 needs to be done in sequence.
     * It is efficient, since step 3 is much quicker than step 2.
     */
    void addNewObjectsOMP();
    
    BaseInteraction* getInteraction(BaseInteractable* P, BaseInteractable* I, unsigned timeStamp);
    
    //BaseInteraction* getExistingInteraction(BaseInteractable* P, BaseInteractable* I) const;
    
    BaseInteraction* createEmptyInteraction() const;
    
    void deleteEmptyInteraction(BaseInteraction* interaction) const;
    
    void* createMPIInteractionDataArray(unsigned int numberOfInteractions) const;
    
    void deleteMPIInteractionDataArray(void* dataArray);
    
    void getInteractionDetails(void* interactionData, unsigned int index, unsigned int& identificationP,
                               unsigned int& identificationI, bool& isWallInteraction, unsigned& timeStamp);
 
    BaseInteraction* getInteraction(BaseInteractable* P, BaseInteractable* I, unsigned timeStamp, const Vec3D& normal);
    
    void removeObjectKeepingPeriodics(unsigned int id);
    
    void eraseOldInteractions(unsigned);
    
    void actionsAfterTimeStep();
    
    Mdouble getMeanOverlap() const;
    
    void write(std::ostream& os) const;
    
    void setWriteVTK(FileType f);
    
    void setWriteVTK(bool);
    
    FileType getWriteVTK() const;
    
    std::string getName() const override;
    
    /*
     * This variable is used in omp simulations to add new objects to the interactionHandler during computeOneTimeStep.
     * Objects are added in three steps:
     *  1. Declare an empty vector newObjects_, one element per thread.
     *  2. When a new object needs to be added to the interactionHandler, don't add it immediately.
     *     Add it to newObjects_[threadNum] instead
     *  3. Add all objects in newObjects_ to the interactionHandler.
     * This reduction approach allows step 2 to be run in parallel, while step 3 needs to be done in sequence.
     * It is efficient, since step 3 is much quicker than step 2.
     */
    std::vector<std::vector<BaseInteraction*>> newObjects_;
 
    double getLiquidBridgeVolume() const;
 
    unsigned getNumberOfLiquidBridges() const;
 
    unsigned getNumberOfWallContacts() const;
 
private:
    
    FileType writeVTK_;
 
    std::map<unsigned,BaseParticle*> particleById;
    std::map<unsigned,BaseWall*> wallById;
};
 
#endif