[8.x] Allow sync broadcast via method (#38557)

* allow sync broadcast via method

* add hook to disable broadcasting via callback

src/Illuminate/Broadcasting/BroadcastManager.php

@@ -112,7 +112,10 @@ public function event($event = null)
      */
     public function queue($event)
     {
-        if ($event instanceof ShouldBroadcastNow) {
+        if ($event instanceof ShouldBroadcastNow ||
+            (is_object($event) &&
+             method_exists($event, 'shouldBroadcastNow') &&
+             $event->shouldBroadcastNow())) {
             return $this->app->make(BusDispatcherContract::class)->dispatchNow(new BroadcastEvent(clone $event));
         }
 

src/Illuminate/Database/Eloquent/BroadcastableModelEventOccurred.php

@@ -114,6 +114,17 @@ public function onChannels(array $channels)
         return $this;
     }
 
+    /**
+     * Determine if the event should be broadcast synchronously.
+     *
+     * @return bool
+     */
+    public function shouldBroadcastNow()
+    {
+        return $this->event === 'deleted' &&
+               ! method_exists($this->model, 'bootSoftDeletes');
+    }
+
     /**
      * Get the event name.
      *

src/Illuminate/Database/Eloquent/BroadcastsEvents.php

@@ -111,6 +111,10 @@ public function broadcastDeleted($channels = null)
      */
     protected function broadcastIfBroadcastChannelsExistForEvent($instance, $event, $channels = null)
     {
+        if (! static::$isBroadcasting) {
+            return;
+        }
+
         if (! empty($this->broadcastOn($event)) || ! empty($channels)) {
             return broadcast($instance->onChannels(Arr::wrap($channels)));
         }

src/Illuminate/Database/Eloquent/Model.php

@@ -166,6 +166,13 @@ abstract class Model implements Arrayable, ArrayAccess, HasBroadcastChannel, Jso
      */
     protected static $lazyLoadingViolationCallback;
 
+    /**
+     * Indicates if broadcasting is currently enabled.
+     *
+     * @var bool
+     */
+    protected static $isBroadcasting = true;
+
     /**
      * The name of the "created at" column.
      *
@@ -377,6 +384,25 @@ public static function handleLazyLoadingViolationUsing(callable $callback)
         static::$lazyLoadingViolationCallback = $callback;
     }
 
+    /**
+     * Execute a callback without broadcasting any model events for all model types.
+     *
+     * @param  callable  $callback
+     * @return mixed
+     */
+    public static function withoutBroadcasting(callable $callback)
+    {
+        $isBroadcasting = static::$isBroadcasting;
+
+        static::$isBroadcasting = false;
+
+        try {
+            return $callback();
+        } finally {
+            static::$isBroadcasting = $isBroadcasting;
+        }
+    }
+
     /**
      * Fill the model with an array of attributes.
      *