Prevent players from having more than one database querying command running at once.

src/main/java/com/gmail/nossr50/commands/player/McrankCommand.java

@@ -7,6 +7,8 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
+import org.bukkit.metadata.FixedMetadataValue;
+import org.bukkit.metadata.MetadataValue;
 import org.bukkit.util.StringUtil;
 
 import com.gmail.nossr50.mcMMO;
@@ -17,7 +19,6 @@ import com.gmail.nossr50.runnables.commands.McrankCommandAsyncTask;
 import com.gmail.nossr50.util.Permissions;
 import com.gmail.nossr50.util.commands.CommandUtils;
 import com.gmail.nossr50.util.player.UserManager;
-
 import com.google.common.collect.ImmutableList;
 
 public class McrankCommand implements TabExecutor {
@@ -88,6 +89,13 @@ public class McrankCommand implements TabExecutor {
                 return;
             }
 
+            if (((Player) sender).hasMetadata(mcMMO.databaseCommandKey)) {
+                sender.sendMessage(LocaleLoader.getString("Commands.Database.Processing"));
+                return;
+            } else {
+                ((Player) sender).setMetadata(mcMMO.databaseCommandKey, new FixedMetadataValue(mcMMO.p, null));
+            }
+
             mcMMOPlayer.actualizeDatabaseATS();
         }
 

src/main/java/com/gmail/nossr50/commands/player/MctopCommand.java

@@ -7,6 +7,7 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
+import org.bukkit.metadata.FixedMetadataValue;
 import org.bukkit.util.StringUtil;
 
 import com.gmail.nossr50.mcMMO;
@@ -19,7 +20,6 @@ import com.gmail.nossr50.util.Permissions;
 import com.gmail.nossr50.util.StringUtils;
 import com.gmail.nossr50.util.commands.CommandUtils;
 import com.gmail.nossr50.util.player.UserManager;
-
 import com.google.common.collect.ImmutableList;
 
 public class MctopCommand implements TabExecutor {
@@ -91,6 +91,13 @@ public class MctopCommand implements TabExecutor {
                 return;
             }
 
+            if (((Player) sender).hasMetadata(mcMMO.databaseCommandKey)) {
+                sender.sendMessage(LocaleLoader.getString("Commands.Database.Processing"));
+                return;
+            } else {
+                ((Player) sender).setMetadata(mcMMO.databaseCommandKey, new FixedMetadataValue(mcMMO.p, null));
+            }
+
             mcMMOPlayer.actualizeDatabaseATS();
         }
 

src/main/java/com/gmail/nossr50/mcMMO.java

@@ -116,6 +116,7 @@ public class mcMMO extends JavaPlugin {
     public final static String playerDataKey       = "mcMMO: Player Data";
     public final static String greenThumbDataKey   = "mcMMO: Green Thumb";
     public final static String pistonDataKey       = "mcMMO: Piston State";
+    public final static String databaseCommandKey  = "mcMMO: Processing Database Command";
 
     public static FixedMetadataValue metadataValue;
 

src/main/java/com/gmail/nossr50/runnables/commands/McrankCommandDisplayTask.java

@@ -57,6 +57,7 @@ public class McrankCommandDisplayTask extends BukkitRunnable {
 
         rank = skills.get(null);
         sender.sendMessage(LocaleLoader.getString("Commands.mcrank.Overall", (rank == null ? LocaleLoader.getString("Commands.mcrank.Unranked") : rank)));
+        player.removeMetadata(mcMMO.databaseCommandKey, mcMMO.p);
     }
 
     public void displayBoard() {

src/main/java/com/gmail/nossr50/runnables/commands/MctopCommandDisplayTask.java

@@ -7,6 +7,7 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 import org.bukkit.scheduler.BukkitRunnable;
 
+import com.gmail.nossr50.mcMMO;
 import com.gmail.nossr50.datatypes.database.PlayerStat;
 import com.gmail.nossr50.datatypes.skills.SkillType;
 import com.gmail.nossr50.locale.LocaleLoader;
@@ -61,6 +62,9 @@ public class MctopCommandDisplayTask extends BukkitRunnable {
             sender.sendMessage(String.format("%2d. %s%s - %s%s", place, ChatColor.GREEN, stat.name, ChatColor.WHITE, stat.statVal));
             place++;
         }
+        if (sender instanceof Player) {
+            ((Player) sender).removeMetadata(mcMMO.databaseCommandKey, mcMMO.p);
+        }
     }
 
     private void displayBoard() {

src/main/resources/locale/locale_en_US.properties

@@ -454,6 +454,7 @@ Commands.Cooldowns.Header=[[GOLD]]--= [[GREEN]]mcMMO Ability Cooldowns[[GOLD]] =
 Commands.Cooldowns.Row.N=\  [[RED]]{0}[[WHITE]] - [[GOLD]]{1} seconds left
 Commands.Cooldowns.Row.Y=\  [[AQUA]]{0}[[WHITE]] - [[DARK_GREEN]]Ready!
 Commands.Database.Cooldown=[[RED]]You must wait 1 second before using this command again.
+Commands.Database.Processing=[[RED]]Your previous command is still being processed. Please wait.
 Commands.Disabled=[[RED]]This command is disabled.
 Commands.DoesNotExist= [[RED]]Player does not exist in the database!
 Commands.GodMode.Disabled=[[YELLOW]]mcMMO Godmode Disabled