private function refreshMetadata()
{
if ($this->metadata == null) {
$apiImplementation = Kafka::getApiImplementation($this->apiVersion);
include_once "{$apiImplementation}/Metadata.php";
$metadataClass = "\\Kafka\\{$apiImplementation}\\Metadata";
$this->metadata = new $metadataClass($this->connectionString);
}
if ($this->producerList) {
foreach ($this->producerList as $producer) {
$producer->close();
}
$this->producerList = array();
}
$this->brokerMetadata = $this->metadata->getBrokerMetadata();
$this->topicMetadata = $this->metadata->getTopicMetadata();
}
