BauSystem_Main/src/de/steamwar/bausystem/BauSystem.java

@@ -42,6 +42,10 @@ import org.bukkit.inventory.meta.ItemMeta;
 import org.bukkit.plugin.java.JavaPlugin;
 import org.bukkit.scheduler.BukkitTask;
 
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.lang.management.ManagementFactory;
 import java.util.UUID;
 
 public class BauSystem extends JavaPlugin implements Listener {
@@ -153,7 +157,28 @@ public class BauSystem extends JavaPlugin implements Listener {
         Player p = e.getPlayer();
         SWScoreboard.removeScoreboard(p);
         if (Bukkit.getOnlinePlayers().isEmpty() || (Bukkit.getOnlinePlayers().size() == 1 && Bukkit.getOnlinePlayers().contains(p))) {
-            Bukkit.shutdown();
+            if (autoShutdown != null) {
+                autoShutdown.cancel();
+            }
+            autoShutdown = Bukkit.getScheduler().runTaskTimer(this, new Runnable() {
+                int count = 0;
+
+                @Override
+                public void run() {
+                    if (count >= 300) {
+                        Bukkit.shutdown();
+                        return;
+                    }
+                    count++;
+                    try {
+                        if (RamUsage.getUsage() > 0.8) {
+                            Bukkit.shutdown();
+                        }
+                    } catch (Throwable throwable) {
+                        Bukkit.shutdown();
+                    }
+                }
+            }, 20, 20);
         }
     }
 

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

@@ -0,0 +1,40 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.bausystem;
+
+import java.lang.management.ManagementFactory;
+
+public class RamUsage {
+
+    private RamUsage() {
+        throw new IllegalStateException("Utility Class");
+    }
+
+    public static double getUsage() {
+        try {
+            long memorySize = ((com.sun.management.OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean()).getTotalPhysicalMemorySize();
+            long freeMemory = ((com.sun.management.OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean()).getFreePhysicalMemorySize();
+            return (memorySize - freeMemory) / (double) memorySize;
+        } catch (Throwable throwable) {
+            return 1D;
+        }
+    }
+
+}