Skip to main content

​
Overview

The Cache library improves performance by storing frequently accessed data in memory or files.

​
Cache Class

From system/library/cache.php:15: 
namespace Opencart\System\Library;

class Cache {
    private object $adaptor;
    
    public function __construct(string $adaptor, int $expire = 3600) {
        $class = 'Opencart\System\Library\Cache\\' . $adaptor;
        
        if (!class_exists($class)) {
            throw new \Exception('Error: Could not load cache adaptor ' . $adaptor . ' cache!');
        }
        
        $this->adaptor = new $class($expire);
    }
    
    public function get(string $key) {
        return $this->adaptor->get($key);
    }
    
    public function set(string $key, $value, int $expire = 0): void {
        $this->adaptor->set($key, $value, $expire);
    }
    
    public function delete(string $key): void {
        $this->adaptor->delete($key);
    }
}

​
Usage

​
Caching Data

// Check cache first
$products = $this->cache->get('category.products.' . $category_id);

if (!$products) {
    // Cache miss - fetch from database
    $products = $this->model_catalog_product->getProducts(['filter_category_id' => $category_id]);
    
    // Store in cache for 1 hour
    $this->cache->set('category.products.' . $category_id, $products, 3600);
}

return $products;

​
Clearing Cache

$this->cache->delete('category.products.' . $category_id);

​
Cache Adapters

  • File: File-based caching
  • Mem: Memcached
  • Redis: Redis server

​
Next Steps

Architecture

Review architecture

Database Library

Database operations