internal SolverContext Save(string path)
{
CpModel model;
if (!Monitors.Any())
{
model = Solver.ExportModel();
}
else if (DecisionBuilder == null)
{
using (var vector = new SearchMonitorVector())
{
foreach (var m in Monitors)
{
vector.Add(m);
}
model = Solver.ExportModelWithSearchMonitors(vector);
}
}
else
{
using (var vector = new SearchMonitorVector())
{
foreach (var m in Monitors)
{
vector.Add(m);
}
model = Solver.ExportModelWithSearchMonitorsAndDecisionBuilder(vector, DecisionBuilder);
}
}
using (var ws = File.Open(path, Create))
{
Assert.NotNull(model);
model.WriteTo(ws);
}
return(this);
}
internal SolverContext Load(string path)
{
var model = new CpModel();
using (var ms = File.Open(path, Open))
{
model.MergeFrom(ms);
}
// TODO: TBD: careful that ModelLoader is disposable...
Assert.That(Solver.ModelLoader(), Is.Null);
if (Monitors.Any())
{
using (var vector = new SearchMonitorVector())
{
foreach (var monitor in Monitors)
{
vector.Add(monitor);
}
Assert.That(Solver.LoadModelWithSearchMonitors(model, vector), Is.True);
}
}
else
{
// TODO: TBD: or s.LoadModelWithSearchMonitors; which also implies that somehow the model has been at least prepared, with variables, monitors, and/or decision builder
Assert.That(Solver.LoadModel(model), Is.True);
}
var loader = Solver.ModelLoader();
Assert.That(loader, Is.Not.Null);
return(this);
}
public void SimpleTestWithSearchMonitorsAndDecisionBuilder()
{
CpModel model;
string modelText;
const string modelName = "TestModelLoader";
const string equationText = "((x(0..10) + y(0..10)) == 5)";
using (var s = new Solver(modelName))
{
var x = s.MakeIntVar(0, 10, "x");
var y = s.MakeIntVar(0, 10, "y");
var c = x + y == 5;
Assert.That(c.Cst.ToString(), Is.EqualTo(equationText));
s.Add(c);
Assert.That(s.ConstraintCount(), Is.EqualTo(1));
var collector = s.MakeAllSolutionCollector();
var db = s.MakePhase(x, y, ChooseFirstUnbound, AssignMinValue);
Console.WriteLine("First search...");
s.NewSearch(db, collector);
while (s.NextSolution())
{
Console.WriteLine($"{x.ToString()} + {y.ToString()} == 5");
break;
}
s.EndSearch();
using (var vect = new SearchMonitorVector())
{
vect.Add(collector);
model = s.ExportModelWithSearchMonitorsAndDecisionBuilder(vect, db);
modelText = model.ToString();
}
}
using (var s = new Solver(modelName))
{
// TODO: TBD: load but without any monitors and/or DB ...
s.LoadModel(model);
var loader = s.ModelLoader();
// Do a quick sanity check that we at least have the proper constraint loaded.
Assert.That(s.ConstraintCount(), Is.EqualTo(1));
var x = loader.IntegerExpressionByName("x").Var();
var y = loader.IntegerExpressionByName("y").Var();
{
var c = x + y == 5;
// These should PASS as well...
Assert.That(c.Cst.ToString(), Is.Not.EqualTo("TrueConstraint()"));
Assert.That(c.Cst.ToString(), Is.EqualTo(equationText));
}
{
/* I dare say that THIS should PASS as well, but due to the fact that IntVar and
* derivatives are treated as IntExpr, it is FAILING. */
var actual = s.ExportModel();
Assert.That(actual.ToString(), Is.EqualTo(modelText));
}
var db = s.MakePhase(x, y, ChooseFirstUnbound, AssignMinValue);
Console.WriteLine("Second search...");
s.NewSearch(db);
while (s.NextSolution())
{
Console.WriteLine($"{x.ToString()} + {y.ToString()} == 5");
}
s.EndSearch();
}
}
