Add Initial setup

src/de/steamwar/bungeecore/Storage.java

@@ -48,4 +48,10 @@ public class Storage {
     public static final Map<Integer, ServerInfo> teamServers = new HashMap<>(); // TeamID -> ServerInfo map
 
     public static final Map<ProxiedPlayer, Map<UUID, PlayerListItem.Item>> directTabItems = new HashMap<>();
+
+    public static final Map<Subserver, String> serverToNodeMap = new HashMap<>();
+
+    public static final Map<String, List<Subserver>> nodeToServerMap = new HashMap<>();
+
+    public static final Map<Subserver, Long> timeOfServerEmpty = new HashMap<>();
 }

src/de/steamwar/bungeecore/Subserver.java

@@ -140,6 +140,7 @@ public class Subserver implements Runnable {
             if(!process.waitFor(1, TimeUnit.MINUTES))
                 process.destroyForcibly();
             thread.join();
+            cleanup();
         }catch(InterruptedException e){
             logger.log(Level.SEVERE, "Subserver stop interrupted!", e);
             Thread.currentThread().interrupt();
@@ -152,12 +153,24 @@ public class Subserver implements Runnable {
                 process.destroy();
             }
             thread.join();
+            cleanup();
         }catch(InterruptedException e){
             logger.log(Level.SEVERE, "Subserver stop interrupted!", e);
             Thread.currentThread().interrupt();
         }
     }
 
+    private void cleanup() {
+        String nodeName = Storage.serverToNodeMap.remove(this);
+        if (nodeName != null) {
+            Storage.nodeToServerMap.computeIfPresent(nodeName, (s, list) -> {
+                list.remove(this);
+                if (list.isEmpty()) return null;
+                return list;
+            });
+        }
+    }
+
     static void shutdown(){
         while (!serverList.isEmpty()) {
             Subserver server = serverList.get(0);
@@ -240,4 +253,8 @@ public class Subserver implements Runnable {
             shutdownCallback.run();
         }
     }
+
+    public long getPID() {
+        return process.pid();
+    }
 }