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/* This file is part of the Palabos library.
 *
 * Copyright (C) 2011-2015 FlowKit Sarl
 * Route d'Oron 2
 * 1010 Lausanne, Switzerland
 * E-mail contact: contact@flowkit.com
 *
 * The most recent release of Palabos can be downloaded at 
 * <http://www.palabos.org/>
 *
 * The library Palabos is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * The library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/


#ifndef ATOMIC_BLOCK_2D_H
#define ATOMIC_BLOCK_2D_H

#include "core/globalDefs.h"
#include "core/blockIdentifiers.h"
#include "core/block2D.h"
#include "core/blockStatistics.h"
#include "core/geometry2D.h"
#include "atomicBlock/dataProcessorWrapper2D.h"
#include "atomicBlock/reductiveDataProcessorWrapper2D.h"
#include <algorithm>
#include <map>

namespace plb {

// Forward declarations
class AtomicBlock2D;
    
/// Handles statistics subscriptions for the BlockLattice2D
class StatSubscriber2D : public StatSubscriber {
public:
    StatSubscriber2D(AtomicBlock2D& block_);
    /// Subscribe a new observable for which the average value is computed.
    virtual plint subscribeAverage();
    /// Subscribe a new observable for which the sum is computed.
    virtual plint subscribeSum();
    /// Subscribe a new observable for which the maximum is computed.
    virtual plint subscribeMax();
    /// Subscribe a new integer observable for which the sum is computed.
    virtual plint subscribeIntSum();
private:
    AtomicBlock2D& block;
};

struct BlockDataTransfer2D {
    virtual ~BlockDataTransfer2D() { }
    virtual plint staticCellSize() const =0;
    virtual void send(Box2D domain, std::vector<char>& buffer, modif::ModifT kind) const =0;
    virtual void receive(Box2D domain, std::vector<char> const& buffer, modif::ModifT kind) =0;
    /// Receive data from a byte-stream into the block, and adjust coordinates if the block contains abolute coordinate data.
    /** By default, offset information is ignored. **/
    virtual void receive(Box2D domain, std::vector<char> const& buffer, modif::ModifT kind, Dot2D offset) {
        receive(domain, buffer, kind);
    }
    /// Receive data from a byte-stream into the block, and re-map IDs for dynamics if exist.
    virtual void receive( Box2D domain, std::vector<char> const& buffer,
                          modif::ModifT kind, std::map<int,std::string> const& foreignIds ) =0;
    virtual void attribute(Box2D toDomain, plint deltaX, plint deltaY,
                           AtomicBlock2D const& from, modif::ModifT kind) =0;
    /// Attribute data between two blocks, and adjust coordinates if the block contains absolute coordinate data.
    virtual void attribute(Box2D toDomain, plint deltaX, plint deltaY,
                           AtomicBlock2D const& from, modif::ModifT kind, Dot2D absoluteOffset)
    {
        attribute(toDomain, deltaX, deltaY, from, kind);
    }
};

class AtomicBlock2D : public Block2D {
public:
    AtomicBlock2D(plint nx_, plint ny_);
    AtomicBlock2D(AtomicBlock2D const& rhs);
    virtual ~AtomicBlock2D();
    void swap(AtomicBlock2D& rhs);
    /// Initialize block content by executing internal processors once.
    void initialize();
public:
    /// Get bounding box of the lattice.
    virtual Box2D getBoundingBox() const;
    /// Get number of cells in x-direction.
    plint getNx() const { return nx; }
    /// Get number of cells in y-direction.
    plint getNy() const { return ny; }
    /// Execute all internal dataProcessors at positive or zero level.
    void executeInternalProcessors();
    /// Execute all internal dataProcessors at a given level.
    void executeInternalProcessors(plint level);
    /// Add a dataProcessor, which is executed after each iteration.
    void integrateDataProcessor(DataProcessor2D* processor, plint level);
    /// Remove all data processors.
    void clearDataProcessors();
    /// Remove all data processors with a given ID.
    void removeDataProcessors(int staticId);
    /// Get access to data transfer between blocks.
    virtual BlockDataTransfer2D& getDataTransfer() =0;
    /// Get access to data transfer between blocks (const version)
    virtual BlockDataTransfer2D const& getDataTransfer() const =0;
    /// Get an object through which the atomic block can be serialized
    virtual DataSerializer* getBlockSerializer (
            Box2D const& domain, IndexOrdering::OrderingT ordering ) const;
    /// Get an object through which the atomic block can be un-serialized
    virtual DataUnSerializer* getBlockUnSerializer (
            Box2D const& domain, IndexOrdering::OrderingT ordering );
public:
    /// Get object to subscribe new internal statistics.
    StatSubscriber& internalStatSubscription();
    /// Copy running statistics to public statistics, and reset running stats.
    void evaluateStatistics();
    /// Get a handle to internal statistics. Don't use this to subscribe new
    /// statistics. Use the method internalStatSubscription() instead.
    BlockStatistics& getInternalStatistics();
    /// Get a constant handle to internal statistics.
    BlockStatistics const& getInternalStatistics() const;
public:
    /// Specify the relative location of the atomic-block in a
    /// global coordinate system.
    void setLocation(Dot2D const& location_);
    /// Get the relative location of the atomic-block in a
    /// global coordinate system.
    Dot2D getLocation() const;
    /// Set the flag value (to be exploited internally by data processors).
    void setFlag(bool value);
    /// Get the flag value (to be exploited internally by data processors).
    bool getFlag() const;
private:
    typedef std::vector<std::vector<DataProcessor2D*> > DataProcessorVector;
private:
    /// Common implementation for explicit/automatic processors.
    void integrateDataProcessor (
                     DataProcessor2D* processor, plint level, DataProcessorVector& processors );
    /// Common implementation for explicit/automatic processors.
    void executeInternalProcessors(plint level, DataProcessorVector& processors);
    /// Copy processors from one vector to another.
    void copyDataProcessors(DataProcessorVector const& from, DataProcessorVector& to);
    /// Release memory for a given species of lattice processors.
    void clearDataProcessors(DataProcessorVector& processors);
private:
    plint nx, ny;    /// Dimensions of the lattice.
    Dot2D location;  /// Absolute, real-space coordinate of the local (0,0) position.
    bool  flag;      /// Flag for internal use by data processors.
    BlockStatistics internalStatistics;
    StatSubscriber2D statisticsSubscriber;
    DataProcessorVector explicitInternalProcessors;
    DataProcessorVector automaticInternalProcessors;
};

Dot2D computeRelativeDisplacement(AtomicBlock2D const& block1, AtomicBlock2D const& block2);

} // namespace plb

#endif  // ATOMIC_BLOCK_2D