DbCache.php

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<?php
 
namespace Ubiquity\cache\database;
 
use Ubiquity\cache\system\ArrayCache;
use Ubiquity\cache\CacheManager;
 
abstract class DbCache {
    protected $cache;
    protected $memoryCache;
    protected $storeDeferred;
    protected $toStore = [ ];
    public static $active = false;
 
    protected function getKey($tableName, $condition) {
        return $tableName . \md5 ( $condition );
    }
 
    public function __construct($cacheSystem = ArrayCache::class, $config = [ ]) {
        if (\is_string ( $cacheSystem )) {
            $this->cache = new $cacheSystem ( CacheManager::getCacheSubDirectory ( 'queries' ), '.query' );
        } else {
            $this->cache = $cacheSystem;
        }
        $this->storeDeferred = $config ['deferred'] ?? false;
    }
 
    protected function getMemoryCache($key) {
        if (isset ( $this->memoryCache [$key] )) {
            return $this->memoryCache [$key];
        }
        if ($this->cache->exists ( $key )) {
            return $this->memoryCache [$key] = $this->cache->fetch ( $key );
        }
        return false;
    }
 
    abstract public function store($tableName, $condition, $result);
 
    public function fetch($tableName, $condition) {
        $key = $this->getKey ( $tableName, $condition );
        if (isset ( $this->memoryCache [$key] )) {
            return $this->memoryCache [$key];
        }
        if ($this->cache->exists ( $key )) {
            return $this->memoryCache [$key] = $this->cache->fetch ( $key );
        }
        return false;
    }
 
    abstract public function delete($tableName, $condition);
 
    public function clear($matches = '') {
        $this->cache->clear ( $matches );
    }
 
    public function remove($key) {
        $this->cache->remove ( $key );
    }
 
    public function setActive($value = true) {
        self::$active = $value;
    }
 
    public function storeDeferred() {
        foreach ( $this->toStore as $k ) {
            $this->cache->store ( $k, $this->memoryCache [$k] );
        }
        $this->toStore = [ ];
    }
}