src/Leevel/Protocol/Pool.php
public function back($obj): void
    {
        if (method_exists($obj, 'destruct')) {
            $obj->destruct();
        }

        $className = $this->normalize(get_class($obj));
        $pool = $this->pool($className);
        $pool->push($obj);
    }
public function back($obj): void
    {
        if (method_exists($obj, 'destruct')) {
            $obj->destruct();
        }

        $className = $this->normalize(get_class($obj));
        $pool = $this->pool($className);
        $pool->push($obj);
    }
返还一个对象.

@param \Object $obj