Add cooldown for empty/full shop owner notifications

src/main/java/com/Acrobot/ChestShop/Configuration/Properties.java

@@ -164,6 +164,8 @@ public class Properties {
     public static boolean SHOW_MESSAGE_OUT_OF_STOCK = true;
     @ConfigurationComment("Do you want to show \"Full shop\" messages?")
     public static boolean SHOW_MESSAGE_FULL_SHOP = true;
+    @ConfigurationComment("How many seconds do you want to wait before showing notifications for the same shop to the owner again?")
+    public static long NOTIFICATION_MESSAGE_COOLDOWN = 10;
 
     @PrecededBySpace
     @ConfigurationComment("Can players hide the \"Out of stock\" messages with /cstoggle?")

src/main/java/com/Acrobot/ChestShop/Listeners/PreTransaction/ErrorMessageSender.java

@@ -7,14 +7,19 @@ import com.Acrobot.ChestShop.Configuration.Properties;
 import com.Acrobot.ChestShop.Database.Account;
 import com.Acrobot.ChestShop.Economy.Economy;
 import com.Acrobot.ChestShop.Events.PreTransactionEvent;
+import com.google.common.collect.HashBasedTable;
+import com.google.common.collect.Table;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerQuitEvent;
 import org.bukkit.inventory.ItemStack;
 
+import java.util.UUID;
+
 import static com.Acrobot.ChestShop.Configuration.Messages.CLIENT_DEPOSIT_FAILED;
 import static com.Acrobot.ChestShop.Configuration.Messages.NOT_ENOUGH_STOCK_IN_YOUR_SHOP;
 import static com.Acrobot.ChestShop.Configuration.Messages.NOT_ENOUGH_SPACE_IN_YOUR_SHOP;
@@ -23,6 +28,16 @@ import static com.Acrobot.ChestShop.Configuration.Messages.NOT_ENOUGH_SPACE_IN_Y
  * @author Acrobot
  */
 public class ErrorMessageSender implements Listener {
+
+    private static Table<UUID, String, Long> notificationCooldowns = HashBasedTable.create();
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public static void onQuit(PlayerQuitEvent event) {
+        if (Properties.NOTIFICATION_MESSAGE_COOLDOWN > 0) {
+            notificationCooldowns.rowMap().remove(event.getPlayer().getUniqueId());
+        }
+    }
+
     @EventHandler(priority = EventPriority.MONITOR)
     public static void onMessage(PreTransactionEvent event) {
         if (!event.isCancelled()) {
@@ -108,10 +123,20 @@ public class ErrorMessageSender implements Listener {
         Player player = Bukkit.getPlayer(ownerAccount.getUuid());
         if (player != null) {
             message = message.replace("%material", "%item");
+            String replacedMessage = message.replace("%item", MaterialUtil.getItemList(stock));
+
+            if (Properties.NOTIFICATION_MESSAGE_COOLDOWN > 0) {
+                Long last = notificationCooldowns.get(player.getUniqueId(), replacedMessage);
+                if (last != null && last + Properties.NOTIFICATION_MESSAGE_COOLDOWN * 1000 > System.currentTimeMillis()) {
+                    return;
+                }
+                notificationCooldowns.put(player.getUniqueId(), replacedMessage, System.currentTimeMillis());
+            }
+
             if (Properties.SHOWITEM_MESSAGE && MaterialUtil.Show.sendMessage(player, message, stock)) {
                 return;
             }
-            player.sendMessage(message.replace("%item", MaterialUtil.getItemList(stock)));
+            player.sendMessage(replacedMessage);
         }
     }
 }