Add 'queuerestart' command

VelocityCore/Persistent/src/de/steamwar/persistent/Persistent.java

@@ -24,9 +24,11 @@ import com.google.inject.Inject;
 import com.google.inject.Module;
 import com.google.inject.name.Names;
 import com.mojang.brigadier.Command;
+import com.mojang.brigadier.context.CommandContext;
 import com.velocitypowered.api.command.BrigadierCommand;
 import com.velocitypowered.api.command.CommandManager;
 import com.velocitypowered.api.command.CommandMeta;
+import com.velocitypowered.api.command.CommandSource;
 import com.velocitypowered.api.event.EventManager;
 import com.velocitypowered.api.event.Subscribe;
 import com.velocitypowered.api.event.proxy.ProxyInitializeEvent;
@@ -71,12 +73,20 @@ public class Persistent {
     private final Logger logger;
     private final Path directory;
 
+    private boolean restartQueued = false;
+
     @Inject
     public Persistent(ProxyServer proxy, Logger logger, @DataDirectory Path dataDirectory) {
         instance = this;
         this.proxy = proxy;
         this.logger = logger;
         this.directory = dataDirectory;
+
+        proxy.getScheduler().buildTask(instance, () -> {
+            if (!restartQueued) return;
+            if (!proxy.getAllPlayers().isEmpty()) return;
+            proxy.shutdown();
+        }).repeat(10, TimeUnit.SECONDS).schedule();
     }
 
     @Subscribe
@@ -89,6 +99,14 @@ public class Persistent {
                                 .build()
                 )
         );
+        proxy.getCommandManager().register(
+                new BrigadierCommand(
+                        BrigadierCommand.literalArgumentBuilder("queuerestart")
+                                .requires(commandSource -> commandSource.hasPermission("bungeecore.softreload"))
+                                .executes(this::queueRestart)
+                                .build()
+                )
+        );
     }
 
     @Subscribe
@@ -97,6 +115,7 @@ public class Persistent {
     }
 
     public int softreload() {
+        restartQueued = false;
         PluginContainer container = null;
         ReloadablePlugin plugin = null;
         try {
@@ -200,4 +219,10 @@ public class Persistent {
         ResourceBundle.clearCache(classLoader);
         classLoader.close();
     }
+
+    public int queueRestart(CommandContext<CommandSource> context) {
+        restartQueued = true;
+        context.getSource().sendRichMessage("§eRestart queued§8.");
+        return Command.SINGLE_SUCCESS;
+    }
 }