Better RamUsage show meter

BauSystem_Main/src/de/steamwar/bausystem/features/world/RamUsage.java

@@ -26,17 +26,15 @@ import org.bukkit.Bukkit;
 import org.bukkit.boss.BarColor;
 import org.bukkit.boss.BarStyle;
 import org.bukkit.boss.BossBar;
-import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
-import org.bukkit.event.player.PlayerJoinEvent;
-import org.bukkit.event.player.PlayerQuitEvent;
 
 import java.lang.management.ManagementFactory;
 import java.util.logging.Level;
 
-@Linked(LinkageType.LISTENER)
+@Linked(LinkageType.PLAIN)
 public class RamUsage implements Listener {
 
+    private boolean mode = false;
     private BossBar bossBar;
 
     public RamUsage() {
@@ -46,17 +44,17 @@ public class RamUsage implements Listener {
             long presumableFreeMemory = Runtime.getRuntime().maxMemory() - allocatedMemory;
             double percentageFree = presumableFreeMemory / (double) Runtime.getRuntime().maxMemory();
             bossBar.setProgress(1 - percentageFree);
-        }, 20, 20);
+            if (mode && percentageFree > 0.7) {
+                mode = false;
+            } else if (!mode && percentageFree < 0.5) {
+                mode = true;
             }
-
-    @EventHandler
-    public void onPlayerJoin(PlayerJoinEvent event) {
-        bossBar.addPlayer(event.getPlayer());
+            if (mode) {
+                Bukkit.getOnlinePlayers().forEach(bossBar::addPlayer);
+            } else {
+                bossBar.removeAll();
             }
-
-    @EventHandler
-    public void onPlayerQuit(PlayerQuitEvent event) {
-        bossBar.removePlayer(event.getPlayer());
+        }, 1, 1);
     }
 
     public static double getUsage() {