Repo2\QueryReactor\Reactor::poll PHP Method

    private function poll()
    {
        $links = [];
        foreach ($this->active as $link) {
            $links[] = $link;
        }
        list($read, $error) = $this->driver->poll($links);
        foreach ($error as $link) {
            $query = $this->active[$link];
            $err = $this->driver->error($link);
            $this->free($link);
            $query->reject($err);
        }
        foreach ($read as $link) {
            $query = $this->active[$link];
            try {
                $result = $this->driver->read($link);
            } catch (\Exception $err) {
                $this->free($link);
                $query->reject($err);
                continue;
            }
            $this->free($link);
            $subquery = $query->resolve($result);
            if ($subquery instanceof Query) {
                $this->execQuery($subquery);
            } elseif ($subquery instanceof \Iterator) {
                $this->execIterator($subquery);
            }
        }
    }