add method to easily run async code

Author: zefir-git

src/main/java/pro/cloudnode/smp/cloudnodemsg/CloudnodeMSG.java

@@ -117,4 +117,11 @@ public void runDDL() {
         }
         getLogger().info("Database successfully initialised with DDL");
     }
+
+    /**
+     * Run code asynchronously
+     */
+    public static void runAsync(final @NotNull Runnable runnable) {
+        getInstance().getServer().getScheduler().runTaskAsynchronously(getInstance(), runnable);
+    }
 }

src/main/java/pro/cloudnode/smp/cloudnodemsg/Mail.java

@@ -2,6 +2,7 @@
 
 import org.bukkit.OfflinePlayer;
 import org.bukkit.Server;
+import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 
 import java.sql.PreparedStatement;
@@ -102,4 +103,17 @@ public static int unread(final @NotNull OfflinePlayer player) {
             return 0;
         }
     }
+
+    /**
+     * Notify online players for their unread mail
+     */
+    public static void notifyUnread() {
+        CloudnodeMSG.runAsync(() -> {
+            for (final @NotNull Player player : CloudnodeMSG.getInstance().getServer().getOnlinePlayers()) {
+                if (!player.hasPermission(Permission.MAIL)) continue;
+                final int unread = Mail.unread(player);
+                if (unread > 0) player.sendMessage(CloudnodeMSG.getInstance().config().mailNotify(unread));
+            }
+        });
+    }
 }

src/main/java/pro/cloudnode/smp/cloudnodemsg/command/Command.java

@@ -18,7 +18,7 @@ public static boolean sendMessage(final @NotNull Audience recipient, final @NotN
 
     @Override
     public final boolean onCommand(final @NotNull CommandSender sender, final @NotNull org.bukkit.command.Command command, final @NotNull String label, @NotNull String @NotNull [] args) {
-        CloudnodeMSG.getInstance().getServer().getScheduler().runTaskAsynchronously(CloudnodeMSG.getInstance(), () -> {
+        CloudnodeMSG.runAsync(() -> {
             final boolean ignored = run(sender, label, args);
         });
         return true;

src/main/java/pro/cloudnode/smp/cloudnodemsg/listener/PlayerJoinListener.java

@@ -12,7 +12,7 @@
 public final class PlayerJoinListener implements Listener {
     @EventHandler
     public void onPlayerJoin(final @NotNull PlayerJoinEvent event) {
-        event.getPlayer().getServer().getScheduler().runTaskAsynchronously(CloudnodeMSG.getInstance(), () -> {
+        CloudnodeMSG.runAsync(() -> {
             if (!CloudnodeMSG.getInstance().config().mailNotifyOnLogin()) return;
             final @NotNull Player player = event.getPlayer();
             if (!player.hasPermission(Permission.MAIL)) return;