helloDataManReader.cpp

/*
 * helloDataManReader.cpp
 *
 *  Created on: Feb 16, 2017
 *      Author: wfg
 */



#include <vector>
#include <iostream> //std::cout, std::endl
#include <string>
#include <numeric> //std::accumulate
#include <functional> //std::multiplies


#include <mpi.h>


#include "ADIOS_CPP.h"

void getcb( const void *data, std::string doid, std::string var, std::string dtype, std::vector<std::size_t> varshape )
{
    std::cout << "data object ID = " << doid << "\n"; //do you need to flush?
    std::cout << "variable name = " << var << "\n";
    std::cout << "data type = " << dtype << "\n";

    std::size_t varsize = std::accumulate(varshape.begin(), varshape.end(), 1, std::multiplies<std::size_t>());

    for( unsigned int i=0; i < varsize; ++i )
        std::cout << ((float*)data)[i] << " ";
    std::cout << std::endl;
}

int main( int argc, char* argv [] )
{
    MPI_Init( &argc, &argv );
    int rank;
    MPI_Comm_rank( MPI_COMM_WORLD, &rank );
    const bool adiosDebug = true;
    adios::ADIOS adios( MPI_COMM_WORLD, adios::Verbose::WARN, adiosDebug );

    try
    {
        //Define method for engine creation, it is basically straight-forward parameters
        adios::Method& datamanSettings = adios.DeclareMethod( "WAN" );
        if( ! datamanSettings.isUserDefined())
        {
            // if not defined by user, we can change the default settings
            datamanSettings.SetEngine( "DataManReader" );
            datamanSettings.SetParameters( "peer-to-peer=yes" );
            datamanSettings.AddTransport( "Mdtm", "localIP=128.0.0.0.1", "remoteIP=128.0.0.0.2", "tolerances=1,2,3" );
            //datamanSettings.AddTransport( "ZeroMQ", "localIP=128.0.0.0.1.1", "remoteIP=128.0.0.0.2.1", "tolerances=1,2,3" ); not yet supported , will throw an exception
        }

        //Create engine smart pointer to DataManReader Engine due to polymorphism,
        //Open returns a smart pointer to Engine containing the Derived class DataManReader
        auto datamanReader = adios.Open( "myDoubles.bp", "r", datamanSettings, adios::IOMode::INDEPENDENT );

        if( datamanReader == nullptr )
            throw std::ios_base::failure( "ERROR: failed to create DataMan I/O engine at Open\n" );

        datamanReader->SetCallBack( getcb );

        adios::Variable<double>* ioMyDoubles = datamanReader->InquireVariableDouble( "ioMyDoubles" );
        if( ioMyDoubles == nullptr )
            std::cout << "Variable ioMyDoubles not read...yet\n";

        datamanReader->Close( );

    }
    catch( std::invalid_argument& e )
    {
        if( rank == 0 )
        {
            std::cout << "Invalid argument exception, STOPPING PROGRAM\n";
            std::cout << e.what() << "\n";
        }
    }
    catch( std::ios_base::failure& e )
    {
        if( rank == 0 )
        {
            std::cout << "System exception, STOPPING PROGRAM\n";
            std::cout << e.what() << "\n";
        }
    }
    catch( std::exception& e )
    {
        if( rank == 0 )
        {
            std::cout << "Exception, STOPPING PROGRAM\n";
            std::cout << e.what() << "\n";
        }
    }

    MPI_Finalize( );

    return 0;

}