Laravelのイベント＆リスナを使ってObserverパターンを実装する

app
├─ Providers
│   ├─ AppServiceProvider.php
│   ├─ AuthServiceProvider.php
│   ├─ BroadcastServiceProvider.php
│   ├─ EventServiceProvider.php
│   └─ RouteServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\Facades\Event;
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\Event' => [
            'App\Listeners\EventListener',
        ],
    ];

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

        //
    }
}

<?php

namespace App\Providers;

use Illuminate\Support\Facades\Event;
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\Event' => [
            'App\Listeners\EventListener',
        ],
        // アクセス時にイベントを発行する側
        'App\Events\AccessDetection' => [
            // テキストを生成＆書き込みを行うリスナー側
            'App\Listeners\MakeTextListener',
        ],
    ];

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

        //
    }
}

# laravelルートディレクトリへ移動
cd /path/to/laravel

# artisanコマンドでイベントとリスナを生成する
php artisan event:generate

# 実行結果
[demo@localhost laravel]$ php artisan event:generate
Events and listeners generated successfully!

app
├─ Events
│   ├─ AccessDetection.php
│   └─ Event.php
├─ Listeners
│   ├─ EventListener.php
│   └─ MakeTextListener.php

<?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;


class AccessDetection
{
    use Dispatchable, InteractsWithSockets, SerializesModels;

    public $param; // ← ココ

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

    /**
     * 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\AccessDetection;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Contracts\Queue\ShouldQueue;

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

    /**
     * Handle the event.
     *
     * @param  AccessDetection  $event
     * @return void
     */
    public function handle(AccessDetection $event)
    {
      // テキストファイル作成
       $file = sprintf('%s/%s.txt', storage_path('texts'), date('Ymd-His'));
      touch($file);
      // 書き込み
       $current = file_get_contents($file);
      $current .= $event->param;
      file_put_contents($file, $current);
    }
}

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

// イベントをuseする
use App\Events\AccessDetection;

class SampleController extends Controller
{
  public function events()
  {
    // イベントをディスパッチする
    event(new AccessDetection(str_random(100)));

    return view('sample_events');
  }
}

// イベントをuseする
use App\Events\AccessDetection;

// イベントをディスパッチする
event(new AccessDetection(str_random(100)));

storage
└─ texts
     └─ 20171115-233354.txt

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