Laravel 广播推送器事件多次触发

Question

我有这个 Laravel 5.1 事件，在存储聊天时触发。但它正在为 Pusher 创建多个广播

<?php namespace App\Events;

use App\Events\Event;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
use Illuminate\Queue\SerializesModels;

class ChatSent extends Event implements ShouldBroadcast
{
    use SerializesModels;

    public $channel;
    public $chat;

    public function __construct($channel,$chat)
    {
        $this->channel = $channel;
        $this->chat = $chat;
    }

    public function broadcastOn()
    {
        return ['private-'.$this->channel];
    }
}

我正在与多名工人一起使用主管（supervisord）......不确定这是否有所不同......这是laravel.conf：

[program:laravel-worker]
process_name=%(program_name)s_%(process_num)02d
command=php /var/www/app/artisan queue:work database --sleep=3 --tries=3 --daemon
autostart=true
autorestart=true
user=ubuntu
numprocs=8
redirect_stderr=true
stdout_logfile=/var/www/app/worker.log

知道为什么会发生这种情况吗？