五步实现简单的 Laravel Events

最近使用了关于laravel events的相关知识，

events实现了一个简单的观察者模式，当某一件事情发生时，监听者listener就会触发某一时间。应用场景：注册成功发送邮件短信等，微信购买成功发送微信消息或图片。实现步骤如下：

• 在EventServiceProvider的$listen添加包含事件和监听对应的值，可以添加多条数组

  <?php
  namespace App\Providers;
  use Illuminate\Contracts\Events\Dispatcher as DispatcherContract;
  use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;
  class EventServiceProvider extends ServiceProvider{
  /**

  • The event listener mappings for the application.

  • @var array
    */
    protected $listen = [
    'App\Events\UserLoggedIn' => [
    'App\Listeners\WriteMessageToFile',
    ],
    ];

    /**

  • Register any other events for your application.
  • @param \Illuminate\Contracts\Events\Dispatcher $events
  • @return void
    */
    public function boot(DispatcherContract $events)
    {
    parent::boot($events);
    }
    }

• 运行php artisan event:generate
• 找到要触发事件的代码，例如用户注册认证成功后要触发该事件，使用event()全局函数注册

  protected function handleUserWasAuthenticated(Request $request, $throttles)
  {
  if ($throttles) {
  $this->clearLoginAttempts($request);
  }

  if (method_exists($this, 'authenticated')) {
      return $this->authenticated($request, Auth::guard($this->getGuard())->user());
  }
  
  // Fire an event that the user has now logged in
  event(new UserLoggedIn($request));
  
  return redirect()->intended($this->redirectPath());

  }

• 更新事件类UserLoggedIn.php

  <?php

  namespace App\Events;

  use App\Events\Event;
  use Illuminate\Queue\SerializesModels;
  use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
  use Illuminate\Http\Request;
  class UserLoggedIn extends Event{
  use SerializesModels;
  public $user;
  /**

  • Create a new event instance.

  • @return void
    */
    public function __construct(Request $request)
    {
    $this->request = $request;
    }

    /**

  • Get the channels the event should be broadcast on.
  • @return array
    */
    public function broadcastOn()
    {
    return [];
    }
    }

• 实现触发事件

  <?php

  namespace App\Listeners;

  use App\Events\UserLoggedIn;
  use Illuminate\Queue\InteractsWithQueue;
  use Illuminate\Contracts\Queue\ShouldQueue;
  use Storage;

  class WriteMessageToFile
  {
  /**

  • Create the event listener.

  • @return void
    */
    public function __construct()
    {
    //
    }

    /**

  • Handle the event.
  • @param UserLoggedIn $event
  • @return void
    */
    public function handle(UserLoggedIn $event)
    {
    $message = $event->request->user()->name . ' just logged in to the application.';
    Storage::put('loginactivity.txt', $message);
    }
    }