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app/Notifications/UnreadItemsChanged.php

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+<?php
+
+namespace App\Notifications;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Notifications\Messages\BroadcastMessage;
+use Illuminate\Notifications\Notification;
+
+class UnreadItemsChanged extends Notification
+{
+    use Queueable;
+
+    /**
+     * Feed items, feeds, documents or folders to recalculate unread items for.
+     *
+     * @var array
+     */
+    private $data = [];
+
+    /**
+     * Create a new notification instance.
+     *
+     * @param null|array Feed items, feeds, documents or folders to recalculate
+     * unread items for
+     * @param null|mixed $data
+     */
+    public function __construct($data = null)
+    {
+        $this->data = $data;
+    }
+
+    /**
+     * Get the notification's delivery channels.
+     *
+     * @param mixed $notifiable
+     *
+     * @return array
+     */
+    public function via($notifiable)
+    {
+        return ['broadcast'];
+    }
+
+    /**
+     * Get the array representation of the notification.
+     *
+     * @param mixed $notifiable
+     *
+     * @return array
+     */
+    public function toArray($notifiable)
+    {
+        return $notifiable->countUnreadItems($this->data);
+    }
+
+    /**
+     * Get the broadcastable representation of the notification.
+     *
+     * @param mixed $notifiable
+     *
+     * @return BroadcastMessage
+     */
+    public function toBroadcast($notifiable)
+    {
+        return (new BroadcastMessage($this->toArray($notifiable)))->onQueue('notifications');
+    }
+
+    /**
+     * Determine which queues should be used for each notification channel.
+     *
+     * @return array
+     */
+    public function viaQueues()
+    {
+        return [
+            'broadcast' => 'notifications',
+        ];
+    }
+}