public function withConnection($cb)
{
// First check idle connections.
if ($this->available->count() > 0) {
$connection = $this->available->dequeue();
$cb($connection);
return;
}
// Check if we have max connections
if ($this->pool->count() >= $this->maxConnections) {
$this->waiting->enqueue($cb);
}
// Otherwise, create a new connection
$connection = ConnectionFactory::createConnection();
$this->pool->attach($connection);
$cb($connection);
}
