code: package org.optsol.project_scheduling.mrcpsp.ctab.constraints;
  
  import com.google.ortools.linearsolver.MPConstraint;
  import com.google.ortools.linearsolver.MPSolver;
  import com.google.ortools.linearsolver.MPVariable;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.Set;
  import org.optsol.jdecor.core.AbstractVariableManager;
  import org.optsol.jdecor.ortools.AbstractOrtoolsConstraintManager;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_E_i;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_H_G;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_L_i;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_V;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_p_im;
  import org.optsol.project_scheduling.mrcpsp.ctab.variables.DecisionVars_Ctab;
  import org.optsol.project_scheduling.utils.Precedence;
  
  public class CTAB_f_SequentialProcessing<CONST
      extends IConstants_V & IConstants_L_i & IConstants_E_i & IConstants_p_im & IConstants_H_G>
      extends AbstractOrtoolsConstraintManager<CONST> {
  
    public CTAB_f_SequentialProcessing() {
      super("i", "j");
    }
  
    @Override
    protected Collection<ConstraintKey> createKeys(CONST constants) {
      Set<Precedence> transitiveClosure = constants.get_H_G();
      HashSet<ConstraintKey> indexes = new HashSet<>();
      for (int i : constants.get_V()) {
        for (int j : constants.get_V()) {
          if (i != j && !transitiveClosure.contains(new Precedence(i, j))) {
            indexes.add(new ConstraintKey(i, j));
          }
        }
      }
      return indexes;
    }
  
    @Override
    protected void configureConstraint(
        MPConstraint constraint,
        CONST constants,
        AbstractVariableManager<MPSolver, MPVariable> variables,
        ConstraintKey index) throws Exception {
  
      int i = index.get("i");
      int j = index.get("j");
  
      double ub = constants.get_L_i(i) + constants.get_p_i_max(i) - constants.get_E_i(j);
  
      constraint.setUb(ub);
  
      constraint.setCoefficient(variables.getVar(DecisionVars_Ctab.y, i, j), ub);
  
      constraint.setCoefficient(variables.getVar(DecisionVars_Ctab.s, i), 1.);
      constraint.setCoefficient(variables.getVar(DecisionVars_Ctab.s, j), -1.);
  
      for (int m : constants.get_M_i(i)) {
        constraint.setCoefficient(
            variables.getVar(DecisionVars_Ctab.x, i, m),
            constants.get_p_im(i, m));
      }
    }
  }
  