Add sign throttle config option.

Allows you to limit how often an Essentials sign can be spammed per player.

Essentials/src/com/earth2me/essentials/ISettings.java

@@ -179,4 +179,6 @@ public interface ISettings extends IConf
 	boolean isTeleportInvulnerability();
 	
 	long getLoginAttackDelay();
+	
+	int getSignUsePerSecond();
 }

Essentials/src/com/earth2me/essentials/Settings.java

@@ -388,7 +388,8 @@ public class Settings implements ISettings
 		cancelAfkOnMove = _cancelAfkOnMove();
 		getFreezeAfkPlayers = _getFreezeAfkPlayers();
 		itemSpawnBl = _getItemSpawnBlacklist();
-		loginAttackDelay = _loginAttackDelay();
+		loginAttackDelay = _getLoginAttackDelay();
+		signUsePerSecond = _getSignUsePerSecond();
 		kits = _getKits();
 		chatFormats.clear();
 	}
@@ -808,7 +809,7 @@ public class Settings implements ISettings
 	
 	private long loginAttackDelay;
 	
-	private long _loginAttackDelay()
+	private long _getLoginAttackDelay()
 	{
 		return config.getLong("login-attack-delay", 0) * 1000;
 	}
@@ -819,4 +820,18 @@ public class Settings implements ISettings
 		return loginAttackDelay;
 	}
 	
+	private int signUsePerSecond;
+	
+	private int _getSignUsePerSecond()
+	{
+		final int perSec = config.getInt("sign-use-per-second", 4);
+		return perSec > 0 ? perSec : 1;
+	}
+	
+	@Override
+	public int getSignUsePerSecond()
+	{
+		return signUsePerSecond;
+	}
+	
 }

Essentials/src/com/earth2me/essentials/User.java

@@ -21,6 +21,7 @@ public class User extends UserData implements Comparable<User>, IReplyTo, IUser
 	private transient final Teleport teleport;
 	private transient long teleportRequestTime;
 	private transient long lastOnlineActivity;
+	private transient long lastThrottledAction;
 	private transient long lastActivity = System.currentTimeMillis();
 	private boolean hidden = false;
 	private transient Location afkPosition = null;
@@ -669,4 +670,23 @@ public class User extends UserData implements Comparable<User>, IReplyTo, IUser
 	{
 		final boolean set = !vanished;
 	}
+	
+	public boolean checkSignThrottle() {
+		if (isSignThrottled()) {
+			return true;
+		}
+		updateThrottle();
+		return false;
+	}
+	
+	public boolean isSignThrottled()
+	{
+		final long minTime = lastThrottledAction + (1000 / ess.getSettings().getSignUsePerSecond());
+		return (System.currentTimeMillis() < minTime);
+	}
+	
+	public void updateThrottle()
+	{
+		lastThrottledAction = System.currentTimeMillis();;
+	}
 }

Essentials/src/com/earth2me/essentials/signs/EssentialsSign.java

@@ -76,6 +76,10 @@ public class EssentialsSign
 	{
 		final ISign sign = new BlockSign(block);
 		final User user = ess.getUser(player);
+		if (user.checkSignThrottle())
+		{
+			return false;
+		}
 		try
 		{
 			return (user.isAuthorized("essentials.signs." + signName.toLowerCase(Locale.ENGLISH) + ".use")

Essentials/src/config.yml

@@ -222,6 +222,12 @@ enabledSigns:
   #- time
   #- weather
   #- protection
+  
+  
+# How many times per second can Essentials signs be interacted with.
+# Values should be between 1-20, 20 being virtually no lag protection.s
+# Lower numbers will reduce the possiblity of lag, but may annoy players.
+sign-use-per-second: 4
 
 # Backup runs a command while saving is disabled
 backup: