/// <summary>
/// This method runs for the life of the program, slowly evolving the level set.
/// </summary>
private static void Maintain()
{
int lastRatingsCount = 0;
while (!IsClosing)
{
Thread.Sleep(1000);
using (var levelsContext = new LevelsContext())
{
int ratingsCount = levelsContext.Ratings.Count();
if (ratingsCount < lastRatingsCount)
lastRatingsCount = ratingsCount;
if (ratingsCount - lastRatingsCount > 10)
{
const int descendants = 3;
var parents = levelsContext.Levels.OrderByDescending(level => levelsContext.GetAverageRatingForLevel(level)).Take(2 * descendants).ToList();
for (int i = 0; i < descendants * 2; i += 2)
{
Level l1 = parents[i].Level.Mutate(MUTATION_RATE);
Level l2 = parents[i + 1].Level.Mutate(MUTATION_RATE);
Level newLevel = l1.Crossover(l2, CROSSOVER_RATE);
levelsContext.Levels.Add(newLevel);
}
}
lastRatingsCount = ratingsCount;
levelsContext.SaveChanges();
}
}
}
/// <summary>
/// Called when a request is received from a client. This method must be thread-safe
/// </summary>
/// <param name="id">The unique identifier of the client</param>
/// <param name="request">A string containing the request received</param>
/// <returns>A string response, or "" if nothing must be sent</returns>
static string OnClientRequest(int id, string request)
{
string[] requestParts = request.Split(' ');
switch (requestParts[0])
{
case "level":
using (var levelsContext = new LevelsContext())
{
int lid = int.Parse(requestParts[1]);
Level l = levelsContext.GetLevelByID(lid);
return l.Encode();
}
case "random":
using (var levelsContext = new LevelsContext())
{
//TODO: give the client a random level. The solution is nontrivial
return "";
}
case "rate":
using (var levelsContext = new LevelsContext())
{
int lid = int.Parse(requestParts[1]);
int rating = int.Parse(requestParts[2]);
levelsContext.AddRating(lid, rating);
levelsContext.SaveChanges();
}
return "done";
default: return "";
}
}
public static void Initialize()
{
Database.SetInitializer<LevelsContext>(new DropCreateDatabaseAlways<LevelsContext>());
using (var levelsContext = new LevelsContext())
{
int count = levelsContext.Levels.Count();
if (count < MIN_LEVELS)
{
for (int i = count; i < MIN_LEVELS; i++)
levelsContext.Levels.Add(GenerateRandomLevel());
}
else if (count > MAX_LEVELS)
{
int toRemove = MAX_LEVELS - count;
var levelsToRemove = levelsContext.Levels.OrderBy(level => levelsContext.GetAverageRatingForLevel(level)).Take(toRemove);
levelsContext.Levels.RemoveRange(levelsToRemove);
}
levelsContext.SaveChanges();
}
MaintainThread = new Thread(Maintain);
MaintainThread.Start();
}
static void Main(string[] args)
{
MaintainLevels.Initialize();
Console.WriteLine("Database up and maintenance daemon running");
ServerSocket = new ServerSocket("any", SERVER_PORT, "\n", OnClientStateChange, OnClientRequest);
Console.WriteLine("Server listening on port {0}", SERVER_PORT);
using (var levelscontext = new LevelsContext())
{
levelscontext.Levels.Add(new LevelEntity());
levelscontext.SaveChanges();
}
for (; ; )
{
Console.Write("> ");
string message = Console.ReadLine();
switch (message)
{
case "exit": Exit(); return;
case "echo": Console.WriteLine("Hello"); break;
}
}
}