public static List <LevelSolution> SolveLevel(Level level, SolveMode solveMode = SolveMode.ShortestSolution)
{
// TODO: This function is probably very inefficient. Investigate performance improvements
// Note: The method seems to perform fast (enough) but need to investigate the memory usage
var solutions = new List <LevelSolution>();
if (solveMode == SolveMode.AllSolutions)
{
solutions.AddRange(GetAllUniqueSolutions(level));
}
else
{
solutions.Add(GetShortestSolution(level));
}
return(solutions);
}
public void Run()
{
Debugger.Break();
int speakerId = 2;
// Entität mit Id laden und verändern
Speaker speaker = _efContext.Find <Speaker>(speakerId);
// Attribut muss Concurrency-Token oder RowVersion sein
speaker.Updated = DateTime.Now;
Thread.Sleep(250);
// Attribut (Spalte) direkt in der Datenbank ändern
const string SQLUPDATE = "UPDATE [dnc].[Speakers] SET Updated = GETDATE() WHERE Id = @Id";
int rowCount = _efContext.Database.ExecuteSqlCommand(SQLUPDATE, new SqlParameter("Id", speakerId));
SolveMode mode = SolveMode.ClientWins;
bool savingFailed = false;
do
{
try
{
// Nun Entität speichern
// Es sollte zu einer DbUpdateConcurrencyException kommen
_efContext.SaveChanges();
savingFailed = false;
}
catch (DbUpdateConcurrencyException ex)
{
savingFailed = true;
switch (mode)
{
case SolveMode.ClientWins:
// Client wins
ex.Entries.ToList().ForEach(e => e.OriginalValues.SetValues(e.GetDatabaseValues()));
break;
case SolveMode.StoreWins:
ex.Entries.ToList().ForEach(e => e.Reload());
break;
case SolveMode.Custom:
ex.Entries.ToList().ForEach(e =>
{
var currentValues = e.CurrentValues;
var databaseValues = e.GetDatabaseValues();
var resolvedValues = databaseValues.Clone();
// Hier kommt die Logik zur Auflösung der Ausnahme
e.OriginalValues.SetValues(databaseValues);
e.CurrentValues.SetValues(resolvedValues);
});
break;
default:
break;
}
}
} while (savingFailed);
}
public static bool IsSolvable(Level level, SolveMode solveMode = SolveMode.ShortestSolution)
{
return(SolveLevel(level).Count > 0);
}
