Object Caching using Decorators

caching.php

<?php

// in App\Repo\Topic.php

interface Topic
{
    public function topics();
}

// in App\Repo\TopicQuery.php

use App\Topic as TopicModel;

class TopicQuery implements Topic
{
    public function topics()
    {
        return TopicModel::with([
            'series',
            'series.content',
        ])->get();
    }
}

// In App\Providers\AppServiceProvider.php

// ...
    public method register()
    {
        $this->app->singleton(Topic::class, function() {
            return new TopicQuery();
        });
    }
// ...

// In App\Http\Controllers\TopicController.php

use App\Repo\Topic;

class TopicController extends Controller
{
    public function index(Topic $topic)
    {
        return view('topic', [
            'topics' => $topic->topics(),
        ]);
    }
}

//////////////////////
// Now with caching //
//////////////////////

// in App\Repo\TopicCache.php

use Cache;

class TopicCache implements Topic
{
    protected $next;
    
    public function __construct(Topic $next)
    {
        $this->next = $next;
    }
    
    public function topics()
    {
        return Cache::remember(60, 'topics', function() {
            $this->next->topics();
        });
    }
}


// In App\Providers\AppServiceProvider.php

// ...
    public method register()
    {   
        $this->app->singleton(Topic::class, function() {
            if (config('cache.enabled')) {
                return new TopicCache(new TopicQuery);
            }
            
            return new TopicQuery;
        });
    }
// ...