FlowShopEval.cpp

/*
* <FlowShopEval.cpp>
* Copyright (C) DOLPHIN Project-Team, INRIA Futurs, 2006-2007
* (C) OPAC Team, LIFL, 2002-2007
*
* Arnaud Liefooghe
*
* This software is governed by the CeCILL license under French law and
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* "http://www.cecill.info".
*
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*
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//-----------------------------------------------------------------------------

#include <FlowShopEval.h>


FlowShopEval::FlowShopEval(unsigned int _M, unsigned int _N, const std::vector< std::vector<unsigned int> > & _p, const std::vector<unsigned int> & _d) :
    M(_M), N (_N), p(_p), d(_d)
{}


void FlowShopEval::operator()(FlowShop & _flowshop)
{
  FlowShopObjectiveVector objVector;
  objVector[0] = makespan(_flowshop);
  objVector[1] = tardiness(_flowshop);
  _flowshop.objectiveVector(objVector);
}



double FlowShopEval::makespan(const FlowShop & _flowshop)
{
  // completion times computation for each job on each machine
  // C[i][j] = completion of the jth job of the scheduling on the ith machine
  std::vector< std::vector<unsigned int> > C = completionTime(_flowshop);
  return C[M-1][_flowshop[N-1]];
}


double FlowShopEval::tardiness(const FlowShop & _flowshop)
{
  // completion times computation for each job on each machine
  // C[i][j] = completion of the jth job of the scheduling on the ith machine
  std::vector< std::vector<unsigned int> > C = completionTime(_flowshop);
  // tardiness computation
  unsigned int long sum = 0;
  for (unsigned int j=0 ; j<N ; j++)
    sum += (unsigned int) std::max (0, (int) (C[M-1][_flowshop[j]] - d[_flowshop[j]]));
  return sum;
}


std::vector< std::vector<unsigned int> > FlowShopEval::completionTime(const FlowShop & _flowshop)
{
  std::vector< std::vector<unsigned int> > C(M,N);
  C[0][_flowshop[0]] = p[0][_flowshop[0]];
  for (unsigned int j=1; j<N; j++)
    C[0][_flowshop[j]] = C[0][_flowshop[j-1]] + p[0][_flowshop[j]];
  for (unsigned int i=1; i<M; i++)
    C[i][_flowshop[0]] = C[i-1][_flowshop[0]] + p[i][_flowshop[0]];
  for (unsigned int i=1; i<M; i++)
    for (unsigned int j=1; j<N; j++)
      C[i][_flowshop[j]] = std::max(C[i][_flowshop[j-1]], C[i-1][_flowshop[j]]) + p[i][_flowshop[j]];
  return C;
}

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