Cached Object

A caching scheme for an object for Laravel 4, inspired by Enterprise Rails.

Requirements

The Cached Object has the following requirements:

• PHP 5.3+

• Laravel 4.0+

Installation

Add the package to your composer.json and run composer update:

{
    "require": {
        "ngmy/cached-object": "dev-master"
    }
}

Add the following to the list of service providers in app/config/app.php:

'Ngmy\CachedObject\CachedObjectServiceProvider',

Add the following to the list of class aliases in app/config/app.php:

'CachedObject' => 'Ngmy\CachedObject\CachedObject',

Examples

Basic Usage

1. Create a physical model, which inherits from Eloquent:

namespace App\Models\Physical;

use Illuminate\Database\Eloquent\Model as Eloquent;

class Movie extends Eloquent {}

2. Create a logical model, which inherits from CachedObject:

namespace App\Models\Logical;

use CachedObject;

class Movie extends CachedObject {

    public static $VERSION = 1;

    public $id;

    public $name;

    public $lengthMinutes;

    public function __construct($id, $name, $lengthMinutes)
    {
        $this->id            = $id;
        $this->name          = $name;
        $this->lengthMinutes = $lengthMinutes;
    }

}

You need to define $VERSION. This property is used to create a unique cache key for a requested object. Please increments this number when you change a structure of a class.

3. Create a logical model of an uncached version, which a class name starts with Uncached:

namespace App\Models\Logical;

class UncachedMovie {

    public static function get($id)
    {
        $m = \App\Models\Physical\Movie::find($id);

        if (is_null($m)) {
            return null;
        } else {
            $movie = new Movie(
                $m->id,
                $m->name,
                $m->length_minutes
            );
            return $movie;
        }
    }

}

In order to get an object of a logical model, you need to define a method whose name starts with get. This method is called only if an object does not exist in a cache.

4. Now, you can get an object from a cache by calling Movie::get().

Physical Model Observers

1. Create a observer.

For example, to rebuild a cache when you updated a physical model, and also to delete a cache when you deleted a physical model, define a observer as follows:

namespace App\Models\Logical;

class MovieObserver
{
    public function saved($m)
    {
        Movie::rebuild($m->id);
    }

    public function deleted($m)
    {
        Movie::clear($m->id);
    }
}

2. Register a observer to a physical model:

\App\Models\Physical\Movie::observe(new \App\Models\Logical\MovieObserver);

More Usage

Please see my unit tests.