QueryCache.php

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<?php

namespace Elgg\Cache;

use Elgg\Config;

class QueryCache extends CacheService {
    
    protected int $query_cache_limit = 50;
    
    protected array $keys = [];
    
    public function __construct(protected Config $config) {
        $flags = CompositeCache::CACHE_RUNTIME;
        
        $this->cache = new CompositeCache('query_cache', $this->config, $flags);
        
        $this->enabled = $this->config->db_disable_query_cache !== true;
        if (isset($this->config->db_query_cache_limit)) {
            $this->query_cache_limit = (int) $this->config->db_query_cache_limit;
        }
    }
    
    public function purge(): void {
        $this->keys = [];
        
        parent::purge();
    }
    
    public function invalidate(): void {
        $this->keys = [];
        
        parent::invalidate();
    }
    
    public function clear(): void {
        $this->keys = [];
        
        parent::clear();
    }
    
    public function save(string $key, mixed $data, null|int|\DateTime $expire_after = null): bool {
        $result = parent::save($key, $data, $expire_after);
        if ($result && !isset($this->keys[$key])) {
            $this->keys[$key] = true;
            
            if (count($this->keys) > $this->query_cache_limit) {
                $this->delete(array_key_first($this->keys));
            }
        }
        
        return $result;
    }
    
    public function load(string $key): mixed {
        if (isset($this->keys[$key])) {
            // when used move key to bottom
            unset($this->keys[$key]);
            $this->keys[$key] = true;
        }
        
        return parent::load($key);
    }
    
    public function delete(string $key): bool {
        unset($this->keys[$key]);
        
        return parent::delete($key);
    }
}