class.arObjectCache.php

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<?php

class arObjectCache
{
    protected static array $cache = array();

    public static function isCached($class, $id): bool
    {
        if (!isset(self::$cache[$class])) {
            return false;
        }
        if (!isset(self::$cache[$class][$id]) || !self::$cache[$class][$id] instanceof ActiveRecord) {
            return false;
        }

        return array_key_exists($id, self::$cache[$class]);
    }

    public static function store(ActiveRecord $object): void
    {
        if (!isset($object->is_new)) {
            self::$cache[get_class($object)][$object->getPrimaryFieldValue()] = $object;
        }
    }

    public static function printStats(): void
    {
        foreach (self::$cache as $class => $objects) {
            echo $class;
            echo ": ";
            echo count($objects);
            echo " Objects<br>";
        }
    }

    public static function get($class, $id): \ActiveRecord
    {
        $instance = new $class();
        if (!self::isCached($class, $id)) {
            throw new arException(arException::GET_UNCACHED_OBJECT, $class . ': ' . $id);
        }

        return self::$cache[$class][$id];
    }

    public static function purge(ActiveRecord $object): void
    {
        unset(self::$cache[get_class($object)][$object->getPrimaryFieldValue()]);
    }

    public static function flush($class_name): void
    {
        if ($class_name instanceof ActiveRecord) {
            $class_name = get_class($class_name);
        }
        unset(self::$cache[$class_name]);
    }
}