object-cache

This Laravel package will allow you to set and forget objects in your Redis cache, with automated Middleware and convenient pre-bundled TTL settings. All you need to supply is a TTL, key name, and method for regenerating the value.

Upgrading from v3.x.x

If upgrading from v3, you will need to make the following changes to your implementation:

Create a PHP class for storing your methods and method configs, and migrate the $this->objects array and your cache methods across. Be sure to move across any dependencies to the new class.
Add a methodClass key to your config/object_cache.php file, and set that value to the fully namespaced class name you created in the previous step.
Delete your object cache Middleware.
Change the Middleware settings in app/Http/Kernel.php to use the package Middleware: \AdamCrampton\ObjectCache\Middleware\CheckObjectCache::class
See the Configuration section below for additional config options you may not have set.

Installation

Run composer require adamcrampton/object-cache in your project directory
Add library service provider AdamCrampton\ObjectCache\ObjectCacheServiceProvider::class and facade 'ObjectCache' => AdamCrampton\ObjectCache\ObjectCacheFacade::class to config/app.php
Create a class for storing your methods, adding use statement for AdamCrampton\ObjectCache\ObjectCache
Add the package Middleware \AdamCrampton\ObjectCache\Middleware\CheckObjectCache::class to app/Http/Kernel.php
Configure your routes to use middleware - see https://laravel.com/docs/5.8/middleware#assigning-middleware-to-routes
Run php artisan vendor:publish - this will add a object_cache.php file to your project's config directory
Add your Redis host to the app's .env (or localhost for local dev - ensure your environment has Redis installed)

Configuration

Configuration can be found in the published config/object_cache.php file.

Edit the parameters and options values for the Redis connection - see https://github.com/nrk/predis/wiki/Connection-Parameters
Add the class name with full namespacing to the methodClass key
The settings under fallback relate to the Get Helper (details further down). If you would like the library to manually fetch the data if the Redis get fails, set this to true. The passRequest option forces the helper to pass the request object into the constructor of your cache method class (only set to true if this is necessary for your application)
Setting logErrors to true will enable the Get Helper to log any failed attempts to get values from Redis and/or fallback attempts

Usage

To initialise a connection:

Add use AdamCrampton\ObjectCache\ObjectCache to the class
Declare a variable to use for your connection, e.g. $redis = ObjectCache::init()

Once initialised, you can use all Predis commands. See:

http://squizzle.me/php/predis/doc/
http://squizzle.me/php/predis/doc/Commands

Middleware

The CheckObjectCache Middleware that ships with the package allows you to add cache objects to be automatically checked on each request, and if missing, set. You will need to add an $this->objects array (configuration) and each corresponding method to your cache store class (mentioned above in installation).

An array of 3 values are required for each item in the $this->objects array. They are:

cacheKey: Name of the key for your object in the Redis store.
cacheTtl: Using either a pre-defined named TTL (see below), or a TTL in seconds.
cacheMethod: The name of the method to regenerate the cache data if not found (i.e. if it is missing or expired).

An example of an implementation using a cache store class:


use App\Models\PartPrice;
use AdamCrampton\ObjectCache\ObjectCache;

class CacheMethodStore
{
    public $objects;
    
    public function __construct()
    {   
        $this->objectCache = new ObjectCache();
        
        $this->objects = [
            [
                'cacheKey' => 'exampleKey',
                'cacheTtl' => $this->objectCache->ttl['hours']['twentyFour'],
                'cacheMethod' => 'setExample'
            ]
        ];
    }

    public function setExample()
    {
        return PartPrice::select(['part_id', 'price'])
            ->get()
            ->toJson();
    }
}

Get Helper

Once initialised, you can fetch an object from the cache using the provided helper. The two parameters you need to pass in are the key and JSON decode option.

If you are passing in the decode option, set this to 'array' or 'object' for the correct return format. Example:

    /**
     * Fetch part data for the front end.
     *
     * @return array
     */
    protected function buildPartData(Request $request)
    {
        return ObjectCache::get('dealer_123456_part_data', 'array');
    }

Pre-configured TTL

A convenience array of TTL values are included with the package. To use one of the values, initalise the Redis connection as mentioned above, and call the ttl property with the appropriate key name. Structure of this TTL array is as follows:

    'default' => [
        'default' => 86400
    ],
    'apc' => [
        'default' => 86400
    ],
    'array' => [
        'default' => 86400
    ],
    'database' => [
        'default' => 86400
    ],
    'file' => [
        'default' => 86400
    ],
    'memcached' => [
        'default' => 86400
    ],
    'redis' => [
        'default' => 86400
    ],
    'minutes' => [
        'one' => 60,
        'five' => 300,
        'ten' => 600,
        'fifteen' => 900,
        'twenty' => 1200,
        'thirty' => 1800,
        'forty' => 2400,
        'fortyFive' => 2700,
        'fifty' => 3000,
        'sixty' => 3600
    ],
    'hours' => [
        'one' => 3600,
        'two' => 7200,
        'three' => 10800,
        'four' => 14400,
        'five' => 18000,
        'six' => 21600,
        'seven' => 25200,
        'eight' => 28800,
        'nine' => 32400,
        'ten' => 36000,
        'eleven' => 39600,
        'twelve' => 43200,
        'twentyFour' => 86400
    ],
    'days' => [
        'one' => 86400,
        'two' => 172800,
        'three' => 259200,
        'four' => 345600,
        'five' => 432000,
        'six' => 518400,
        'seven' => 604800,
        'fourteen' => 1209600,
        'twentyEight' => 2419200
    ],
    'weeks' => [
        'one' => 604800,
        'two' => 1209600,
        'three' => 1814400,
        'four' => 2419200,
        'five' => 3024000,
        'six' => 3628800
    ]
];