Laravel 事件示例

Laravel

Laravel Event 提供了一些简单的观察器，用来实现用户订阅或者监听 web 应用中触发的各种事件。在 laravel 中，所有的 event 类都保存在 app/Events 文件夹下，所有的监听类被存放在 app/Listeners 文件夹下。

让我们开始吧，看看他们是怎么工作的

//首先在项目目录下执行如下命令

php artisan event:generate
php artisan make:event UserRegisteredEvent
php artisan make:listener SendMailListener --event="UserRegisteredEvent"

上述命令分别生成如下文件：

UserRegisteredEvent.php

<?php

namespace App\Events;

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

class UserRegisteredEvent
{
    use Dispatchable, InteractsWithSockets, SerializesModels;

    public $title;
    public $body;
    public $to;

    public function __construct($title, $body, $to)
    {
        $this->title = $title;
        $this->body = $body;
        $this->to = $to;
    }

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

<?php

namespace App\Listeners;

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

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

    /**
     * Handle the event.
     *
     * @param  UserRegisteredEvent  $event
     * @return void
     */
    public function handle(UserRegisteredEvent $event)
    {
        echo "Start sending email".PHP_EOL;
        sleep(2);
        echo "Email sended to {$event->to}".PHP_EOL;
    }
}

EventServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Auth\Events\Registered;
use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;
use Illuminate\Support\Facades\Event;

class EventServiceProvider extends ServiceProvider
{
    /**
     * The event listener mappings for the application.
     *
     * @var array
     */
    protected $listen = [
        'App\Events\UserRegistered' => [
            'App\Listeners\SendRegistrationEmail',
        ],
    ];

    /**
     * Register any events for your application.
     *
     * @return void
     */
    public function boot()
    {
        parent::boot();

        //
    }
}

现在让我们在控制器中添加如下代码来进行测试

        for ($i=0; $i < 10; $i++) {
            event(new UserRegisteredEvent("hi", "how are you", "alex@gmail.com"));
        }

最后一步，执行 queue

php artisan queue:work

Done

[2020-06-17 08:18:57][171] Processing: App\Listeners\SendRegistrationEmail
Start sending email
Email sended to alex@gmail.com
[2020-06-17 08:18:59][171] Processed:  App\Listeners\SendRegistrationEmail
[2020-06-17 08:18:59][172] Processing: App\Listeners\SendRegistrationEmail
Start sending email
Email sended to alex@gmail.com
[2020-06-17 08:19:01][172] Processed:  App\Listeners\SendRegistrationEmail
[2020-06-17 08:19:01][173] Processing: App\Listeners\SendRegistrationEmail
Start sending email
Email sended to alex@gmail.com
[2020-06-17 08:19:03][173] Processed:  App\Listeners\SendRegistrationEmail
[2020-06-17 08:19:03][174] Processing: App\Listeners\SendRegistrationEmail
Start sending email
Email sended to alex@gmail.com
[2020-06-17 08:19:05][174] Processed:  App\Listeners\SendRegistrationEmail
[2020-06-17 08:19:05][175] Processing: App\Listeners\SendRegistrationEmail
Start sending email
Email sended to alex@gmail.com
[2020-06-17 08:19:07][175] Processed:  App\Listeners\SendRegistrationEmail
[2020-06-17 08:19:07][176] Processing: App\Listeners\SendRegistrationEmail
Start sending email
Email sended to alex@gmail.com
[2020-06-17 08:19:09][176] Processed:  App\Listeners\SendRegistrationEmail
[2020-06-17 08:19:09][177] Processing: App\Listeners\SendRegistrationEmail
Start sending email
Email sended to alex@gmail.com
[2020-06-17 08:19:11][177] Processed:  App\Listeners\SendRegistrationEmail
[2020-06-17 08:19:11][178] Processing: App\Listeners\SendRegistrationEmail
Start sending email
Email sended to alex@gmail.com
[2020-06-17 08:19:13][178] Processed:  App\Listeners\SendRegistrationEmail
[2020-06-17 08:19:13][179] Processing: App\Listeners\SendRegistrationEmail
Start sending email
Email sended to alex@gmail.com
[2020-06-17 08:19:15][179] Processed:  App\Listeners\SendRegistrationEmail
[2020-06-17 08:19:15][180] Processing: App\Listeners\SendRegistrationEmail
Start sending email
Email sended to alex@gmail.com
[2020-06-17 08:19:17][180] Processed:  App\Listeners\SendRegistrationEmail