fixed the Bus command Handling forwarding the call to a matching Handler class

src/Bus/BusServiceProvider.php

@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * (c) Toby Zerner <toby.zerner@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Flarum\Bus;
+
+use Flarum\Foundation\AbstractServiceProvider;
+use Illuminate\Contracts\Bus\Dispatcher as BusContract;
+use Illuminate\Contracts\Queue\Factory as QueueFactoryContract;
+
+class BusServiceProvider extends AbstractServiceProvider
+{
+    public function boot()
+    {
+        $this->app->bind(BusContract::class, function ($app) {
+            return new Dispatcher($app, function ($connection = null) use ($app) {
+                return $app[QueueFactoryContract::class]->connection($connection);
+            });
+        });
+    }
+}

src/Bus/Dispatcher.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Flarum\Bus;
+
+use Illuminate\Bus\Dispatcher as BaseDispatcher;
+
+class Dispatcher extends BaseDispatcher
+{
+    public function getCommandHandler($command)
+    {
+        $handler = get_class($command) . 'Handler';
+
+        if (class_exists($handler)) {
+            return $this->container->make($handler);
+        }
+
+        return parent::getCommandHandler($command);
+    }
+}