ObjectCommunicator.hpp

/*

Copyright (c) 2005-2012, University of Oxford.
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 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice,
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   software without specific prior written permission.

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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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*/

#ifndef _OBJECTCOMMUNICATOR_HPP_
#define _OBJECTCOMMUNICATOR_HPP_

#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>

#include <string>
#include <assert.h>

class ObjectCommunicator
{

public:

    ObjectCommunicator()
    {
    }

    template<typename CLASS>
    void SendObject(CLASS* const p_object, unsigned destinationProcess, unsigned tag)
    {
        // Create an output archive
        std::stringstream ss;
        boost::archive::text_oarchive output_arch(ss);

        output_arch << p_object;

        std::string send_msg = ss.str();

        // Get + send string length
        unsigned string_length = send_msg.size();
        MPI_Send(&string_length, 1, MPI_UNSIGNED, destinationProcess, tag, PETSC_COMM_WORLD);

        // Pack it into a string of chars
        char arc_string[string_length];
        strcpy( arc_string, send_msg.c_str());

        // Send archive data
        MPI_Send(arc_string, string_length, MPI_CHAR, destinationProcess, tag, PETSC_COMM_WORLD);
    }

    template<typename CLASS>
    CLASS* RecvObject(unsigned sourceProcess, unsigned tag, MPI_Status& status)
    {
        unsigned string_length = 0;
        MPI_Recv(&string_length, 1, MPI_UNSIGNED, sourceProcess, tag, PETSC_COMM_WORLD, &status);

        char recv_string[string_length];
        MPI_Recv(&recv_string, string_length, MPI_CHAR, sourceProcess , tag, PETSC_COMM_WORLD, &status);

        // Make it into a string
        std::string rcv_msg;
        for(unsigned i=0; i<string_length; i++)
        {
            rcv_msg.push_back(recv_string[i]);
        }

        // Save
        std::stringstream ss;
        ss << rcv_msg;

        CLASS* p_recv_object;
        boost::archive::text_iarchive input_arch(ss);

        input_arch >> p_recv_object;

        return p_recv_object;
    }

};
#endif // _OBJECTCOMMUNICATOR_HPP_