Added OP Player JoinEvent nofication when update available

src/main/java/com/rsscripting/serveradmin/RSServerAdmin.java

@@ -24,6 +24,7 @@ public class RSServerAdmin extends JavaPlugin {
     private WorldsDAO worldsDAO;
     private CreeperSettingsDAO creeperSettingsDAO;
     private MobEquipmentDropSettingsDAO equipmentDropSettingsDAO;
+    private GitHubUpdateChecker gitHubUpdateChecker;
 
     @Override
     public void onEnable() {
@@ -156,6 +157,11 @@ public class RSServerAdmin extends JavaPlugin {
                     this
             );
 
+            getServer().getPluginManager().registerEvents(
+                    new UpdateNotificationListener(),
+                    this
+            );
+
         } catch (Exception ex) {
 
             getLogger().log(
@@ -169,9 +175,12 @@ public class RSServerAdmin extends JavaPlugin {
             return;
         }
 
-        new GitHubUpdateChecker(
-                this
-        ).checkForUpdates();
+        gitHubUpdateChecker =
+                new GitHubUpdateChecker(
+                        this
+                );
+
+        gitHubUpdateChecker.checkForUpdates();
 
         getLogger().info("RS-ServerAdmin enabled.");
     }
@@ -217,5 +226,10 @@ public class RSServerAdmin extends JavaPlugin {
         return equipmentDropSettingsDAO;
 
     }
+    public GitHubUpdateChecker getGitHubUpdateChecker() {
+
+        return gitHubUpdateChecker;
+
+    }
 
 }

src/main/java/com/rsscripting/serveradmin/listeners/UpdateNotificationListener.java

@@ -0,0 +1,55 @@
+package com.rsscripting.serveradmin.listeners;
+
+import com.rsscripting.serveradmin.RSServerAdmin;
+import com.rsscripting.serveradmin.update.GitHubUpdateChecker;
+
+import org.bukkit.ChatColor;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
+
+public class UpdateNotificationListener
+        implements Listener {
+
+    @EventHandler
+    public void onPlayerJoin(
+            PlayerJoinEvent event
+    ) {
+
+        Player player =
+                event.getPlayer();
+
+        if (!player.isOp()) {
+            return;
+        }
+
+        GitHubUpdateChecker checker =
+                RSServerAdmin.getInstance()
+                        .getGitHubUpdateChecker();
+
+        if (checker == null) {
+            return;
+        }
+
+        if (!checker.isUpdateAvailable()) {
+            return;
+        }
+
+        player.sendMessage(
+                ChatColor.YELLOW
+                        + "[RS-ServerAdmin] "
+                        + ChatColor.GOLD
+                        + "Update Available! "
+                        + ChatColor.GRAY
+                        + "Current: "
+                        + RSServerAdmin.getInstance()
+                        .getDescription()
+                        .getVersion()
+                        + " Latest: "
+                        + checker.getLatestVersionFound()
+        );
+
+    }
+
+}

src/main/java/com/rsscripting/serveradmin/update/GitHubUpdateChecker.java

@@ -11,6 +11,8 @@ public class GitHubUpdateChecker {
 
     private final JavaPlugin plugin;
     private final String pomUrl;
+    private volatile boolean updateAvailable = false;
+    private volatile String latestVersion = null;
 
     private static final String POM_URL =
             "https://raw.githubusercontent.com/RS-Scripting/RS-ServerAdmin/main/pom.xml";
@@ -55,12 +57,19 @@ public class GitHubUpdateChecker {
                                         latestVersion
                                 )) {
 
+                                    updateAvailable = false;
+
                                     plugin.getLogger().info(
                                             "RS-ServerAdmin is up to date."
                                     );
 
                                 } else {
 
+                                    updateAvailable = true;
+
+                                    this.latestVersion =
+                                            latestVersion;
+
                                     plugin.getLogger().warning(
                                             "Update available! Current: "
                                                     + currentVersion
@@ -118,4 +127,16 @@ public class GitHubUpdateChecker {
 
     }
 
+    public boolean isUpdateAvailable() {
+
+        return updateAvailable;
+
+    }
+
+    public String getLatestVersionFound() {
+
+        return latestVersion;
+
+    }
+
 }