Call checkSpawns from World instead of from Player

src/main/java/emu/grasscutter/server/game/GameServer.java

@@ -10,6 +10,7 @@ import emu.grasscutter.command.CommandMap;
 import emu.grasscutter.database.DatabaseHelper;
 import emu.grasscutter.game.Account;
 import emu.grasscutter.game.GenshinPlayer;
+import emu.grasscutter.game.World;
 import emu.grasscutter.game.dungeons.DungeonManager;
 import emu.grasscutter.game.gacha.GachaManager;
 import emu.grasscutter.game.managers.ChatManager;
@@ -26,6 +27,7 @@ public final class GameServer extends MihoyoKcpServer {
 	private final GameServerPacketHandler packetHandler;
 
 	private final Map<Integer, GenshinPlayer> players;
+	private final Set<World> worlds;
 	
 	private final ChatManager chatManager;
 	private final InventoryManager inventoryManager;
@@ -50,6 +52,7 @@ public final class GameServer extends MihoyoKcpServer {
 		this.address = address;
 		this.packetHandler = new GameServerPacketHandler(PacketHandler.class);
 		this.players = new ConcurrentHashMap<>();
+		this.worlds = Collections.synchronizedSet(new HashSet<>());
 		
 		this.chatManager = new ChatManager(this);
 		this.inventoryManager = new InventoryManager(this);
@@ -84,6 +87,10 @@ public final class GameServer extends MihoyoKcpServer {
 		return players;
 	}
 
+	public Set<World> getWorlds() {
+		return worlds;
+	}
+
 	public ChatManager getChatManager() {
 		return chatManager;
 	}
@@ -161,12 +168,32 @@ public final class GameServer extends MihoyoKcpServer {
 	}
 	
 	public void onTick() throws Exception {
+		Iterator<World> it = this.getWorlds().iterator();
+		while (it.hasNext()) {
+			World world = it.next();
+			
+			if (world.getPlayerCount() == 0) {
+				it.remove();
+			}
+			
+			world.onTick();
+		}
+		
 		for (GenshinPlayer player : this.getPlayers().values()) {
 			player.onTick();
 		}
 
 		OnGameServerTick.post(new GameServerTickEvent());
 	}
+	
+	public void registerWorld(World world) {
+		this.getWorlds().add(world);
+	}
+	
+	public void deregisterWorld(World world) {
+		// TODO Auto-generated method stub
+		
+	}
 
 	@Override
 	public void onStartFinish() {