src/de/steamwar/bungeecore/BungeeCore.java

@@ -89,9 +89,10 @@ public class BungeeCore extends Plugin {
         new WorldDownloader();
         new BrandListener();
 
-        commands.put("/b", null);
-        commands.put("/gs", null);
-        commands.put("/bau", null);
+        new Node.LocalNode();
+        new Node.RemoteNode("lx");
+        new Node.RemoteNode("az");
+
         commands.put("/tp", null);
         commands.put("/bc", null);
         commands.put("/bauchat", null);
@@ -158,14 +159,13 @@ public class BungeeCore extends Plugin {
 
     @Override
     public void onDisable(){
-        ErrorLogger.stop();
-        Statement.close();
         try {
             SteamwarDiscordBot.instance().getJda().shutdownNow();
             SteamwarDiscordBot.instance().getJda().awaitStatus(JDA.Status.SHUTDOWN);
-        } catch (Exception e) {
-            // Ignored
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
         }
+        Statement.close();
     }
 
     public static BungeeCore get() {

src/de/steamwar/bungeecore/ErrorLogger.java

@@ -20,83 +20,51 @@
 package de.steamwar.bungeecore;
 
 import de.steamwar.bungeecore.sql.SWException;
-import net.md_5.bungee.api.ProxyServer;
+import de.steamwar.bungeecore.sql.Statement;
 
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
 import java.text.MessageFormat;
-import java.util.logging.Filter;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 import java.util.logging.Handler;
 import java.util.logging.Level;
 import java.util.logging.LogRecord;
+import java.util.logging.Logger;
 
-public class ErrorLogger extends Handler implements Filter {
-    private static ErrorLogger instance;
+public class ErrorLogger extends Handler {
     private int ddosRate = 0;
 
     ErrorLogger(){
-        ProxyServer.getInstance().getLogger().addHandler(this);
-        ProxyServer.getInstance().getLogger().setFilter(this);
-        instance = this;
-    }
-
-    static void stop(){
-        ProxyServer.getInstance().getLogger().removeHandler(instance);
+        Logger.getLogger("").addHandler(this);
     }
 
     @Override
-    public boolean isLoggable(LogRecord record) {
-        if(record.getLevel() != Level.SEVERE)
-            return true;
+    public void publish(LogRecord logRecord) {
+        if(logRecord.getLevel().intValue() < Level.WARNING.intValue())
+            return;
 
-        StringBuilder stacktrace = new StringBuilder(record.getSourceClassName() + "\n" + record.getSourceMethodName());
-        Throwable thrown = record.getThrown();
-        while(thrown != null){
-            stacktrace.append("\nCaused by ").append(thrown.getMessage());
+        String message = MessageFormat.format(logRecord.getMessage(), logRecord.getParameters());
+        for(String reason : ignoreContains)
+            if(message.contains(reason))
+                return;
 
-            for(StackTraceElement ste : thrown.getStackTrace())
-                stacktrace.append("\n").append(ste.toString());
-
-            thrown = thrown.getCause();
-        }
-
-        String stacktraceString = stacktrace.toString();
-        if(stacktraceString.contains("Cannot request protocol")){
-            ddosRate++;
-            if(ddosRate % 1000 == 0){
+        ByteArrayOutputStream stacktraceOutput = new ByteArrayOutputStream();
+        if(logRecord.getThrown() != null)
+            logRecord.getThrown().printStackTrace(new PrintStream(stacktraceOutput));
+        String stacktrace = stacktraceOutput.toString();
+        if(stacktrace.contains("Cannot request protocol")) {
+            if(++ddosRate % 1000 == 0) {
                 SWException.log("Bungee", "DDOS", ddosRate + "");
             }
-            return false;
-        }
-        return true;
-    }
-
-    @Override
-    public void publish(LogRecord record) {
-        if(record.getLevel() != Level.SEVERE && record.getLevel() != Level.WARNING)
             return;
-
-        StringBuilder stacktrace = new StringBuilder(record.getSourceClassName() + "\n" + record.getSourceMethodName());
-        Throwable thrown = record.getThrown();
-        while(thrown != null){
-            stacktrace.append("\nCaused by ").append(thrown.getMessage());
-
-            for(StackTraceElement ste : thrown.getStackTrace())
-                stacktrace.append("\n").append(ste.toString());
-
-            thrown = thrown.getCause();
+        } else if (!Statement.connectionStable()) {
+            return;
         }
 
-        String stacktraceString = stacktrace.toString();
-        String message = MessageFormat.format(record.getMessage(), record.getParameters());
 
-        if(message.contains("ServerConnector")
-                || message.contains("InitialHandler")
-                || message.contains("UpstreamBridge")
-                || message.contains("DownstreamBridge")
-                || message.contains(" took ")
-                || message.contains("No client connected for pending server!"))
-            return;
-
-        SWException.log("Bungee", message, stacktraceString);
+        SWException.log("Bungee", message, stacktrace);
     }
 
     @Override
@@ -108,4 +76,17 @@ public class ErrorLogger extends Handler implements Filter {
     public void close() {
         //ignored
     }
+
+    private static final List<String> ignoreContains;
+
+    static {
+        List<String> contains = new ArrayList<>();
+        contains.add("ServerConnector");
+        contains.add("InitialHandler");
+        contains.add("UpstreamBridge");
+        contains.add("DownstreamBridge");
+        contains.add(" took ");
+        contains.add("No client connected for pending server!");
+        ignoreContains = Collections.unmodifiableList(contains);
+    }
 }

src/de/steamwar/bungeecore/LoadEvaluation.java

@@ -1,96 +0,0 @@
-/*
- * This file is a part of the SteamWar software.
- *
- * Copyright (C) 2021  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.bungeecore;
-
-import java.io.*;
-
-public class LoadEvaluation {
-    private LoadEvaluation(){}
-
-    private static final File meminfo = new File("/proc/meminfo");
-
-    public static double getRamPercentage() {
-        try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(meminfo)))) {
-            String memTotal = bufferedReader.readLine().replaceAll(" +", " ");
-            bufferedReader.readLine();
-            String memAvailable = bufferedReader.readLine().replaceAll(" +", " ");
-
-            long memTotalLong = getNumber(memTotal);
-            long memAvailableLong = getNumber(memAvailable);
-            return (memTotalLong - memAvailableLong) / (double) memTotalLong;
-        } catch (IOException e) {
-            return 1D;
-        }
-    }
-
-    public static double getRemoteRamPercentage(String remote) {
-        try {
-            // Attention:
-            // memInfo.sh needs to contain: cat /proc/meminfo
-            Process process = new ProcessBuilder("ssh", remote, "\"./memInfo.sh\"").start();
-            process.waitFor();
-            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
-            String memTotal = bufferedReader.readLine().replaceAll(" +", " ");
-            bufferedReader.readLine();
-            String memAvailable = bufferedReader.readLine().replaceAll(" +", " ");
-
-            long memTotalLong = getNumber(memTotal);
-            long memAvailableLong = getNumber(memAvailable);
-            return (memTotalLong - memAvailableLong) / (double) memTotalLong;
-        } catch (IOException e) {
-            return 1D;
-        } catch (InterruptedException e) {
-            Thread.currentThread().interrupt();
-            return 1D;
-        }
-    }
-
-    public static double getCPULoad() {
-        try {
-            Process process = new ProcessBuilder("bash", "-c", "cat <(grep 'cpu ' /proc/stat) <(sleep 1 && grep 'cpu ' /proc/stat) | awk -v RS=\"\" '{printf \"%.2f\\n\", ($13-$2+$15-$4)*100/($13-$2+$15-$4+$16-$5)}'").start();
-            process.waitFor();
-            return Double.parseDouble(new BufferedReader(new InputStreamReader(process.getInputStream())).readLine()) / 100.0;
-        } catch (IOException e) {
-            return 1D;
-        } catch (InterruptedException e) {
-            Thread.currentThread().interrupt();
-            return 1D;
-        }
-    }
-
-    public static double getRemoteCPULoad(String remote) {
-        try {
-            // Attention:
-            // cpuLoad.sh needs to contain: cat <(grep 'cpu ' /proc/stat) <(sleep 1 && grep 'cpu ' /proc/stat) | awk -v RS="" '{printf "%.2f\n", ($13-$2+$15-$4)*100/($13-$2+$15-$4+$16-$5)}'
-            Process process = new ProcessBuilder("ssh", remote, "\"./cpuLoad.sh\"").start();
-            process.waitFor();
-            return Double.parseDouble(new BufferedReader(new InputStreamReader(process.getInputStream())).readLine()) / 100.0;
-        } catch (IOException e) {
-            return 1D;
-        } catch (InterruptedException e) {
-            Thread.currentThread().interrupt();
-            return 1D;
-        }
-    }
-
-    private static long getNumber(String s) {
-        return Long.parseLong(s.split(" ")[1]);
-    }
-}

src/de/steamwar/bungeecore/Node.java

@@ -0,0 +1,261 @@
+/*
+    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.bungeecore;
+
+import net.md_5.bungee.api.ProxyServer;
+
+import java.io.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import java.util.function.Consumer;
+import java.util.logging.Level;
+
+public abstract class Node {
+
+    private static final List<String> JVM_ARGS = Arrays.asList("-Dlog4j.configurationFile=log4j2.xml", "-server", "-Xms128M", "-XX:+UseCompressedOops", "-XX:+TieredCompilation", "-XX:TargetSurvivorRatio=90", "-XX:SurvivorRatio=8", "-XX:MaxTenuringThreshold=15", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseBiasedLocking", "-XX:UseSSE=3", "-XX:+UseCodeCacheFlushing", "-XX:+UseThreadPriorities", "-XX:+AggressiveOpts", "-XX:+ReduceSignalUsage", "-XX:+UseInterpreter", "-XX:+UseSharedSpaces", "-XX:AllocatePrefetchStyle=1", "-XX:+AlwaysCompileLoopMethods", "-XX:+UseConcMarkSweepGC", "-XX:+RewriteFrequentPairs", "-XX:+OptimizeStringConcat", "-XX:+CMSCleanOnEnter", "-XX:+UseInlineCaches");
+    private static final List<String> JVM8_ARGS = Arrays.asList("-XX:ThreadPriorityPolicy=42", "-XX:SharedReadOnlySize=30m", "-XX:+UseFastEmptyMethods", "-XX:+UseFastAccessorMethods");
+    private static final double MIN_FREE_MEM = 4.0 * 1024 * 1024; // 4 GiB
+
+    private static final List<Node> nodes = new ArrayList<>();
+    public static Node local = null;
+
+    public static Node getNode() {
+        Node node = local;
+        double minLoad = local.getLoad();
+        if(minLoad < 0.5)
+            return local;
+
+        synchronized (nodes) {
+            Iterator<Node> it = nodes.iterator();
+            while(it.hasNext()) {
+                Node n = it.next();
+                double load = n.getLoad();
+                if (load < minLoad) {
+                    minLoad = load;
+                    node = n;
+                } else if (load == Double.POSITIVE_INFINITY) {
+                    BungeeCore.get().getLogger().log(Level.SEVERE, "Removing " + n.getName() + " due to infinite load!");
+                    it.remove();
+                }
+            }
+        }
+        return node;
+    }
+
+    public static void forEach(Consumer<Node> consumer) {
+        consumer.accept(local);
+        synchronized (nodes) {
+            nodes.forEach(consumer);
+        }
+    }
+
+    public abstract ProcessBuilder startServer(String serverJar, File directory, String worldDir, String levelName, int port, String xmx, String... dParams);
+    public abstract void execute(String... command);
+    public abstract String getName();
+    public abstract double getLoad();
+
+    protected void constructServerstart(List<String> cmd, String serverJar, String worldDir, String levelName, int port, String xmx, String... dParams) {
+        boolean jdk11 = serverJar.contains("1.15.2");
+
+        if(jdk11)
+            cmd.add("/usr/lib/jvm/java-11-openjdk-amd64/bin/java");
+        else
+            cmd.add("java");
+
+        for(String param : dParams){
+            cmd.add("-D" + param);
+        }
+        cmd.add("-Xmx" + xmx);
+        cmd.addAll(JVM_ARGS);
+        if(!jdk11)
+            cmd.addAll(JVM8_ARGS);
+        cmd.add("-jar");
+        cmd.add("/binarys/" + serverJar);
+        cmd.add("--log-strip-color");
+        cmd.add("--world-dir");
+        cmd.add(worldDir);
+        cmd.add("--level-name");
+        cmd.add(levelName);
+        cmd.add("--port");
+        cmd.add(String.valueOf(port));
+        cmd.add("nogui");
+    }
+
+    protected void execute(ProcessBuilder builder) {
+        try {
+            builder.start().waitFor();
+        } catch (IOException e) {
+            throw new SecurityException("Could not execute command", e);
+        } catch (InterruptedException e) {
+            ProxyServer.getInstance().getLogger().log(Level.SEVERE, "Interrupted during execution", e);
+            Thread.currentThread().interrupt();
+        }
+    }
+
+    public static class LocalNode extends Node {
+        private static final File meminfo = new File("/proc/meminfo");
+        private static final File loadavg = new File("/proc/loadavg");
+
+        private final int cores;
+
+        public LocalNode() {
+            this.cores = Runtime.getRuntime().availableProcessors();
+            local = this;
+        }
+
+        @Override
+        public ProcessBuilder startServer(String serverJar, File directory, String worldDir, String levelName, int port, String xmx, String... dParams) {
+            List<String> cmd = new ArrayList<>();
+            constructServerstart(cmd, serverJar, worldDir, levelName, port, xmx, dParams);
+            ProcessBuilder builder = new ProcessBuilder(cmd);
+            builder.directory(directory);
+            return builder;
+        }
+
+        @Override
+        public void execute(String... command) {
+            execute(new ProcessBuilder(command));
+        }
+
+        @Override
+        public String getName() {
+            return "local";
+        }
+
+        @Override
+        public double getLoad() {
+            double totalMem;
+            double freeMem;
+            try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(meminfo)))) {
+                totalMem = Double.parseDouble(bufferedReader.readLine().replaceAll(" +", " ").split(" ")[1]);
+                bufferedReader.readLine();
+                freeMem = Double.parseDouble(bufferedReader.readLine().replaceAll(" +", " ").split(" ")[1]);
+            } catch (IOException e) {
+                throw new SecurityException("Could not read local memory", e);
+            }
+
+            double cpuLoad;
+            try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(loadavg)))) {
+                cpuLoad = Double.parseDouble(bufferedReader.readLine().split(" ")[0]);
+            } catch (IOException e) {
+                throw new SecurityException("Could not read local cpu", e);
+            }
+
+            return cpuLoad / cores + (freeMem > MIN_FREE_MEM ? 0 : ((totalMem - freeMem) / totalMem));
+        }
+    }
+
+    public static class RemoteNode extends Node {
+        private final int cores;
+        private final String remote;
+
+        public RemoteNode(String remote) {
+            this.remote = remote;
+
+            //Determin core count
+            Process process;
+            try {
+                process = new ProcessBuilder("ssh", remote, "nproc").start();
+                if(!process.waitFor(5, TimeUnit.SECONDS))
+                    throw new IOException("Timeout of " + remote + " on init");
+            } catch (IOException e) {
+                BungeeCore.get().getLogger().log(Level.SEVERE, "Could not initialize " + remote);
+                cores = 1;
+                return;
+            } catch (InterruptedException e) {
+                Thread.currentThread().interrupt();
+                cores = 1;
+                return;
+            }
+
+            int c;
+            try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
+                c = Integer.parseInt(bufferedReader.readLine());
+            } catch (IOException e) {
+                BungeeCore.get().getLogger().log(Level.SEVERE, "Could not read cores of" + remote, e);
+                c = 1;
+            }
+            cores = c;
+            BungeeCore.get().getLogger().log(Level.INFO, "Adding node " + remote + " with " + cores + " cores.");
+
+            synchronized (nodes) {
+                nodes.add(this);
+            }
+        }
+
+        @Override
+        public ProcessBuilder startServer(String serverJar, File directory, String worldDir, String levelName, int port, String xmx, String... dParams) {
+            List<String> cmd = new ArrayList<>();
+            cmd.add("ssh");
+            cmd.add("-L");
+            cmd.add(port + ":localhost:" + port);
+            cmd.add(remote);
+            cmd.add("cd");
+            cmd.add(directory.getPath());
+            cmd.add(";");
+            constructServerstart(cmd, serverJar, worldDir, levelName, port, xmx, dParams);
+            return new ProcessBuilder(cmd);
+        }
+
+        @Override
+        public void execute(String... command) {
+            List<String> cmd = new ArrayList<>();
+            cmd.add("ssh");
+            cmd.add(remote);
+            cmd.addAll(Arrays.asList(command));
+            execute(new ProcessBuilder(cmd));
+        }
+
+        @Override
+        public String getName() {
+            return remote;
+        }
+
+        @Override
+        public double getLoad() {
+            Process process;
+            try {
+                process = new ProcessBuilder("ssh", remote, "cat /proc/loadavg;cat /proc/meminfo").start();
+                if(!process.waitFor(1, TimeUnit.SECONDS))
+                    return Double.POSITIVE_INFINITY;
+            } catch (IOException e) {
+                BungeeCore.get().getLogger().log(Level.SEVERE, "Could starting process to read load", e);
+                return Double.POSITIVE_INFINITY;
+            } catch (InterruptedException e) {
+                Thread.currentThread().interrupt();
+                return Double.POSITIVE_INFINITY;
+            }
+
+            try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
+                double cpuLoad = Double.parseDouble(bufferedReader.readLine().split(" ")[0]);
+                double totalMem = Double.parseDouble(bufferedReader.readLine().replaceAll(" +", " ").split(" ")[1]);
+                bufferedReader.readLine();
+                double freeMem = Double.parseDouble(bufferedReader.readLine().replaceAll(" +", " ").split(" ")[1]);
+                return cpuLoad / cores + (freeMem > MIN_FREE_MEM ? 0 : ((totalMem - freeMem) / totalMem));
+            } catch (IOException e) {
+                BungeeCore.get().getLogger().log(Level.SEVERE, "Could read load", e);
+                return Double.POSITIVE_INFINITY;
+            }
+        }
+    }
+}

src/de/steamwar/bungeecore/SubserverSystem.java

@@ -27,18 +27,14 @@ import net.md_5.bungee.api.chat.ClickEvent;
 import net.md_5.bungee.api.connection.ProxiedPlayer;
 
 import java.io.File;
-import java.io.IOException;
 import java.net.InetSocketAddress;
 import java.time.format.DateTimeFormatter;
-import java.util.*;
-import java.util.logging.Level;
+import java.util.UUID;
 
 public class SubserverSystem {
     private SubserverSystem(){}
 
-    private static final String BACKBONE = "/home/minecraft/backbone/";
-    private static final List<String> JVM_ARGS = Arrays.asList("-Dlog4j.configurationFile=log4j2.xml", "-server", "-Xms128M", "-XX:+UseCompressedOops", "-XX:+TieredCompilation", "-XX:TargetSurvivorRatio=90", "-XX:SurvivorRatio=8", "-XX:MaxTenuringThreshold=15", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseBiasedLocking", "-XX:UseSSE=3", "-XX:+UseCodeCacheFlushing", "-XX:+UseThreadPriorities", "-XX:+AggressiveOpts", "-XX:+ReduceSignalUsage", "-XX:+UseInterpreter", "-XX:+UseSharedSpaces", "-XX:AllocatePrefetchStyle=1", "-XX:+AlwaysCompileLoopMethods", "-XX:+UseConcMarkSweepGC", "-XX:+RewriteFrequentPairs", "-XX:+OptimizeStringConcat", "-XX:+CMSCleanOnEnter", "-XX:+UseInlineCaches");
-    private static final List<String> JVM8_ARGS = Arrays.asList("-XX:ThreadPriorityPolicy=42", "-XX:SharedReadOnlySize=30m", "-XX:+UseFastEmptyMethods", "-XX:+UseFastAccessorMethods");
+    private static final String BACKBONE = "/home/minecraft/";
     private static final String ARENA_PATH =  BACKBONE + "arenaserver/";
     private static final String SERVER_PATH = BACKBONE + "server/";
     private static final String EVENT_PATH = BACKBONE + "event/";
@@ -91,6 +87,7 @@ public class SubserverSystem {
      */
     public static synchronized Subserver startArena(ArenaMode modus, String map, int eventFightID, int checkSchemID, int prepareSchemID, String serverName, String mapName, UUID player1, UUID player2, boolean ranked){
         //Generate missing parameters
+        Node node = eventFightID > 0 ? Node.local : Node.getNode();
         int port = freePort(FIRST_ARENA_PORT);
 
         if(serverName == null){
@@ -109,56 +106,31 @@ public class SubserverSystem {
             worldDir = ARENA_PATH;
 
         //Copy world
-        try {
-            new ProcessBuilder("cp", "-r", SERVER_PATH + modus.getFolder() + "/arenas/" + map, worldDir + mapName).start().waitFor();
-        } catch (IOException e) {
-            throw new SecurityException("Could not copy folder", e);
-        } catch (InterruptedException e) {
-            ProxyServer.getInstance().getLogger().log(Level.SEVERE, "Interrupted while copying folder", e);
-            Thread.currentThread().interrupt();
-        }
+        node.execute("cp", "-r", SERVER_PATH + modus.getFolder() + "/arenas/" + map, worldDir + mapName);
 
         File directory = new File(SERVER_PATH, modus.getFolder());
-        List<String> cmd = serverStartCommand(
-                modus.serverJar(),
-                directory,
-                worldDir,
-                mapName,
-                port,
-                "2G",
-                "logPath=" + mapName,
-                "config="+modus.getConfig(),
-                "fightID=" + eventFightID,
-                "ranked=" + ranked,
-                "checkSchemID=" + checkSchemID,
-                "prepareSchemID=" + prepareSchemID,
+        ProcessBuilder builder = node.startServer(
+                modus.serverJar(), directory, worldDir, mapName, port, "2G",
+                "logPath=" + mapName, "config=" + modus.getConfig(),
+                "fightID=" + eventFightID, "ranked=" + ranked,
+                "checkSchemID=" + checkSchemID, "prepareSchemID=" + prepareSchemID,
                 player1 != null && eventFightID != -1 ? "blueLeader=" + player1 : null,
-                player2 != null ? "redLeader=" + player2 : null);
-
-        //Start server
-        ProcessBuilder process = new ProcessBuilder(cmd);
-        process.directory(directory);
+                player2 != null ? "redLeader=" + player2 : null
+        );
 
         String finalMapName = mapName;
         if(eventFightID == -1)
-            return new Bauserver(serverName, player1, port, process, () -> deleteFolder(ARENA_PATH + finalMapName));
+            return new Bauserver(serverName, player1, port, builder, () -> deleteFolder(node, ARENA_PATH + finalMapName));
         else
-            return new Subserver(Servertype.ARENA, serverName, port, process, () -> {
+            return new Subserver(Servertype.ARENA, serverName, port, builder, () -> {
                 if(eventFightID > 0)
                     return;
-                deleteFolder(ARENA_PATH + finalMapName);
+                deleteFolder(node, ARENA_PATH + finalMapName);
             });
     }
 
-    public static void deleteFolder(String worldName){
-        try {
-            new ProcessBuilder("rm", "-r", worldName).start().waitFor();
-        } catch (IOException e) {
-            throw new SecurityException("Could not clean up folder", e);
-        } catch (InterruptedException e) {
-            ProxyServer.getInstance().getLogger().log(Level.SEVERE, "Interrupted while deleting folder", e);
-            Thread.currentThread().interrupt();
-        }
+    public static void deleteFolder(Node node, String worldName){
+        node.execute("rm", "-r", worldName);
     }
 
     public static Subserver startEventArena(EventFight eventFight, String serverName){
@@ -183,25 +155,15 @@ public class SubserverSystem {
         if(bauRunning(p, owner))
             return;
 
+        copyBauweltIfRequired(prototype, worldFolder + worldName);
         SteamwarUser user = SteamwarUser.get(owner);
-        copyBauweltIfRequired(p, prototype, worldFolder + worldName);
+        File directory = new File(SERVER_PATH, serverName);
+        Node node = Node.getNode();
         int port = freePort(4000);
 
-        File directory = new File(SERVER_PATH, serverName);
-        List<String> cmd = serverStartCommand(
-                serverJar,
-                directory,
-                worldDir,
-                worldName,
-                port,
-                xmx,
-                "logPath=" + worldName);
-
-        //Start server
-        ProcessBuilder process = new ProcessBuilder(cmd);
-        process.directory(directory);
-
-        new Bauserver(user.getUserName() + "s Bau", owner, port, process, () -> {}).sendPlayer(p);
+        new Bauserver(user.getUserName() + "s Bau", owner, port, node.startServer(
+                serverJar, directory, worldDir, worldName, port, xmx, "logPath=" + worldName
+        ), () -> {}).sendPlayer(p);
     }
 
     public static void sendToBauServer(ProxiedPlayer p, UUID owner){
@@ -235,63 +197,6 @@ public class SubserverSystem {
                 new ClickEvent(ClickEvent.Action.RUN_COMMAND, "/bau addmember " + p.getName()));
     }
 
-    private static List<String> serverStartCommand(String serverJar, File directory, String worldDir, String levelName, int port, String xmx, String... dParams){
-        List<String> cmd = new ArrayList<>();
-        boolean jdk11 = serverJar.contains("1.15.2");
-
-        boolean fallback = false;
-        if (!steamwarStartAvailable()) {
-            cmd.add("ssh");
-            cmd.add("-L");
-            cmd.add(port + ":localhost:" + port);
-            if (remoteStartAvailable("lx")) {
-                cmd.add("lx");
-            } else if (remoteStartAvailable("az")) {
-                cmd.add("az");
-            } else {
-                fallback = true;
-            }
-            cmd.add("cd");
-            cmd.add(directory.getPath());
-            cmd.add(";");
-        }
-        if (fallback) {
-            cmd.clear();
-        }
-
-        if(jdk11)
-            cmd.add("/usr/lib/jvm/java-11-openjdk-amd64/bin/java");
-        else
-            cmd.add("java");
-
-        for(String param : dParams){
-            cmd.add("-D" + param);
-        }
-        cmd.add("-Xmx" + xmx);
-        cmd.addAll(JVM_ARGS);
-        if(!jdk11)
-            cmd.addAll(JVM8_ARGS);
-        cmd.add("-jar");
-        cmd.add("/binarys/" + serverJar);
-        cmd.add("--log-strip-color");
-        cmd.add("--world-dir");
-        cmd.add(worldDir);
-        cmd.add("--level-name");
-        cmd.add(levelName);
-        cmd.add("--port");
-        cmd.add(String.valueOf(port));
-
-        return cmd;
-    }
-
-    private static boolean steamwarStartAvailable(){
-        return LoadEvaluation.getCPULoad() < 0.7 && LoadEvaluation.getRamPercentage() < 0.8;
-    }
-
-    private static boolean remoteStartAvailable(String remote) {
-        return LoadEvaluation.getRemoteCPULoad(remote) < 0.7 && LoadEvaluation.getRemoteRamPercentage(remote) < 0.8;
-    }
-
     private static boolean bauRunning(ProxiedPlayer p, UUID owner){
         for(Subserver subserver : Subserver.getServerList()){
             if(subserver.getType() == Servertype.BAUSERVER && ((Bauserver)subserver).getOwner().equals(owner)){
@@ -302,20 +207,10 @@ public class SubserverSystem {
         return false;
     }
 
-    private static void copyBauweltIfRequired(ProxiedPlayer p, String sourcePath, String targetPath){
+    private static void copyBauweltIfRequired(String sourcePath, String targetPath){
         File w = new File(targetPath);
-        if (!w.exists() || !w.isDirectory()){
-            try {
-                new ProcessBuilder("cp", "-r", sourcePath, targetPath).start().waitFor();
-            } catch (IOException e) {
-                Message.send("SERVER_WORLD_ERROR", p);
-                throw new SecurityException("Could not create Bauwelt", e);
-            } catch (InterruptedException e){
-                BungeeCore.log("Could not create Bauwelt", e);
-                Message.send("SERVER_WORLD_ERROR", p);
-                Thread.currentThread().interrupt();
-            }
-        }
+        if (!w.exists() || !w.isDirectory())
+            Node.local.execute("cp", "-r", sourcePath, targetPath);
     }
 
     private static int freePort(int start){

src/de/steamwar/bungeecore/commands/BauCommand.java

@@ -257,7 +257,7 @@ public class BauCommand extends BasicCommand {
                     break;
                 }
             }
-            SubserverSystem.deleteFolder(world);
+            SubserverSystem.deleteFolder(Node.local, world);
         });
     }
 

src/de/steamwar/bungeecore/commands/StatCommand.java

@@ -19,8 +19,8 @@
 
 package de.steamwar.bungeecore.commands;
 
-import de.steamwar.bungeecore.LoadEvaluation;
 import de.steamwar.bungeecore.Message;
+import de.steamwar.bungeecore.Node;
 import net.md_5.bungee.api.CommandSender;
 
 import java.io.BufferedReader;
@@ -36,34 +36,22 @@ public class StatCommand extends BasicCommand {
 
     @Override
     public void execute(CommandSender sender, String[] args) {
+        Map<String, Integer> serverCount = new HashMap<>();
         try {
             Process process = new ProcessBuilder("ps", "x").start();
-            process.waitFor();
-            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
-            Map<String, Integer> serverCounts = new HashMap<>();
-            bufferedReader.lines().forEach(s -> {
-                if (!s.contains("--port")) {
+            new BufferedReader(new InputStreamReader(process.getInputStream())).lines().forEach(s -> {
+                if (!s.contains("--port"))
                     return;
-                }
-                String server = "SW";
-                if (s.contains("ssh -L")) {
-                    server = s.substring(s.indexOf("ssh -L") + 6).split(" ")[2];
-                }
-                serverCounts.put(server, serverCounts.computeIfAbsent(server, s1 -> 0) + 1);
+                serverCount.compute(
+                        s.contains("ssh -L") ? s.substring(s.indexOf("ssh -L") + 6).split(" ")[2] : "local",
+                        (server, count) -> (count != null ? count : 0) + 1
+                );
             });
-            serverCounts.forEach((s, integer) -> {
-                if (s.equals("SW")) {
-                    Message.send("STAT_SERVER", sender, s, LoadEvaluation.getRamPercentage(), LoadEvaluation.getCPULoad(), integer);
-                } else {
-                    Message.send("STAT_SERVER", sender, s.toUpperCase(), LoadEvaluation.getRemoteRamPercentage(s), LoadEvaluation.getRemoteCPULoad(s), integer);
-                }
-            });
-            if (serverCounts.isEmpty()) {
-                Message.send("NO_STATS", sender);
-            }
         } catch (Exception e) {
             throw new SecurityException(e.getMessage(), e);
         }
+
+        Node.forEach(node -> Message.send("STAT_SERVER", sender, node.getName(), node.getLoad(), serverCount.getOrDefault(node.getName(), 0)));
     }
 
 }

src/de/steamwar/bungeecore/sql/Statement.java

@@ -40,39 +40,48 @@ public class Statement {
         Statement.user = user;
         Statement.password = password;
         try {
-            con = DriverManager.getConnection(url + "?autoreconnect=true", user, password);
+            con = DriverManager.getConnection(url + "?autoreconnect=true&useServerPrepStmts=true", user, password);
         } catch (SQLException e) {
             ProxyServer.getInstance().stop();
             throw new SecurityException("Could not start SQL-Connection", e);
         }
     }
 
-    private static void reset(SQLException e) {
-        BungeeCore.get().getLogger().log(Level.WARNING, "SQL Exception thrown", e);
+    private static void reset() {
         close();
         connect(url, user, password);
         try {
             for (Statement statement : statements) {
                 statement.init();
             }
-        } catch (SQLException ex) {
-            throw new SecurityException("Could not reprepare SQL Statements", ex);
+        } catch (SQLException e) {
+            throw new SecurityException("Could not reprepare SQL statements", e);
         }
     }
 
     public static void close() {
-        for (Statement statement : statements) {
+        synchronized (statements) {
+            for (Statement statement : statements) {
+                try {
+                    statement.st.close();
+                } catch (SQLException e) {
+                    BungeeCore.get().getLogger().log(Level.INFO, "Could not close statement", e);
+                }
+            }
+
             try {
-                statement.st.close();
+                con.close();
             } catch (SQLException e) {
-                BungeeCore.get().getLogger().log(Level.INFO, "Could not close statement", e);
+                BungeeCore.get().getLogger().log(Level.INFO, "Could not close SQL connection", e);
             }
         }
+    }
 
+    public static boolean connectionStable() {
         try {
-            con.close();
+            return !con.isClosed();
         } catch (SQLException e) {
-            BungeeCore.log("Could not close SQL-Connection", e);
+            return false;
         }
     }
 
@@ -85,39 +94,38 @@ public class Statement {
         try {
             init();
         } catch (SQLException e) {
-            reset(e);
+            throw new SecurityException("Could not init SQL statement", e);
         }
     }
 
-    private synchronized void init() throws SQLException {
+    private void init() throws SQLException {
         st = con.prepareStatement(sql);
     }
 
     <T> T select(ResultSetUser<T> user, Object... objects) {
-        return prepare(() -> {
-            ResultSet rs = st.executeQuery();
-            T result = user.use(rs);
-            rs.close();
-            return result;
-        }, objects);
+        synchronized (statements) {
+            return prepare(() -> {
+                ResultSet rs = st.executeQuery();
+                T result = user.use(rs);
+                rs.close();
+                return result;
+            }, objects);
+        }
     }
 
     void update(Object... objects) {
-        prepare(st::executeUpdate, objects);
+        synchronized (statements) {
+            prepare(st::executeUpdate, objects);
+        }
     }
 
-    private synchronized <T> T prepare(SQLRunnable<T> runnable, Object... objects) {
+    private <T> T prepare(SQLRunnable<T> runnable, Object... objects) {
         try {
             setObjects(objects);
             return runnable.run();
         } catch (SQLException e) {
-            reset(e);
-            try {
-                setObjects(objects);
-                return runnable.run();
-            } catch (SQLException ex) {
-                throw new SecurityException("Could not execute SQL statement", ex);
-            }
+            reset();
+            throw new SecurityException("Could not execute SQL statement", e);
         }
     }
 

src/de/steamwar/messages/BungeeCore.properties

@@ -107,8 +107,7 @@ MOD_YELLOW_PLUR=§7Deaktiviere die Mods\n§e{0}\n§7um weiter auf §eSteam§8War
 
 #Various commands
 ALERT=§f{0}
-STAT_SERVER=§7Server §f{0} - §7Ram §f{1} §7CPU §f{2} §7Server Count §f{3}
-NO_STATS=§7Kein Bau oder Fight Server gestartet
+STAT_SERVER=§7Server §e{0}§8: §7Load §e{1} §7Serveranzahl §e{2}
 
 #Ban&Mute-Command
 BAN_TEAM_BANNED={0} §c{1} wurde von {2} {3} gebannt. §f§lGrund: §f{4}

steamwarci.yml

@@ -0,0 +1,6 @@
+build:
+  - "ln -s /home/gitea/lib"
+  - "mvn package -B"
+
+artifacts:
+  "/binarys/bungeecore.jar": "target/bungeecore.jar"