laravel-事件

1、注册事件以及监听器

首先我们需要在 app/Providers/目录下的EventServiceProvider.php中注册事件监听器映射关系，如下：

/**
     * The event listener mappings for the application.
     *
     * @var array
     */
    protected $listen = [
        Registered::class => [
            SendEmailVerificationNotification::class,
        ],
        //上面是框架自带
        'App\Events\BlogView' => [
            'App\Listeners\BlogViewListener',
        ],
    ];

　　

然后项目根目录下执行如下命令
php artisan event:generate
该命令完成后，会分别自动在 app/Events和app/Listensers目录下生成 BlogView.php和BlogViewListener.php文件。

2、定义事件

在 app/Events/目录下的BlogView.php中定义事件，在__construct()的参数填写我们需要操作的类。如下：

<?php

namespace App\Events;

use Illuminate\Broadcasting\Channel;
use Illuminate\Queue\SerializesModels;
use Illuminate\Broadcasting\PrivateChannel;
use Illuminate\Broadcasting\PresenceChannel;
use Illuminate\Foundation\Events\Dispatchable;
use Illuminate\Broadcasting\InteractsWithSockets;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
use App\Model\Admin\ArticleModel;

class BlogView
{
    use Dispatchable, InteractsWithSockets, SerializesModels;

    /**
     * Create a new event instance.
     *
     * @return void
     */
    public function __construct(ArticleModel $article)
    {
        $this->article = $article;
    }

    /**
     * Get the channels the event should broadcast on.
     *
     * @return \Illuminate\Broadcasting\Channel|array
     */
    public function broadcastOn()
    {
        return new PrivateChannel('channel-name');
    }
}

　3、定义监听

在 app/Listeners/目录下的BlogViewListener.php中，在handle()的处理业务逻辑。如下：

<?php

namespace App\Listeners;

use App\Events\BlogView;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Contracts\Queue\ShouldQueue;

class BlogViewListener
{
    /**
     * Create the event listener.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    /**
     * Handle the event.
     *
     * @param  BlogView  $event
     * @return void
     */
    public function handle(BlogView $event)
    {
        $event->article->where('art_id', '=', $event->article->art_id)->increment('clicks'); //点击自增//保存数据库
    }
}

　4、触发事件

<?php

namespace App\Http\Controllers\Home;

use App\Events\BlogView;
use Illuminate\Support\Facades\Event;
use App\Model\Admin\ArticleModel;
use App\Model\Admin\CategoryModel;
use Illuminate\Http\Request;

class IndexController extends CommonController
{

    public function article(Request $request, $id){
        $articleModel = new ArticleModel();
       // $articleModel->where('art_id', '=', $id)->increment('clicks'); //点击自增
        $data = $articleModel->findOrFail($id);
        $categoryModel = new CategoryModel();
        $cate = $categoryModel->parentTree($data->cate_id); //获取上级分类
        $pre = $articleModel->where([['cate_id','=',$data->cate_id],['art_id','<',$id]])->first(); //获取上一篇文章
        $next = $articleModel->where([['cate_id','=',$data->cate_id],['art_id','>',$id]])->first();
        $relation = $articleModel->where('cate_id', '=', $data->cate_id)->get(); //获取相关文章
        Event::dispatch(new BlogView($data)); //通过查看源码，Event::fire 更改为Event::dispatch
//        event(new BlogView($data));
        return View('home.new',compact('data','cate','pre', 'next', 'relation'));
    }

}

　　

 其他关于事件的操作，如队列。

链接：https://laravelacademy.org/post/19508.html