Fetching metadata

Fetching topic/broker metadata can be done via Consumer/Producer::get_metadata. This will return a Metadata object that contains all the information:

// Create a consumer
Consumer consumer(...);

// Fetch all metadata
Metadata metadata = consumer.get_metadata();

cout << "Found " << metadata.get_brokers().size() << " brokers" << endl;
cout << "Found " << metadata.get_topics().size() << " topics" << endl;

If you only want to fetch the metadata for a single topic, you can use the overload that takes a Topic object:

// Get the topic object
const Topic topic = consumer.get_topic("some_topic");

// Fetch a specific topic's metadata
TopicMetadata metadata = consumer.get_metadata(topic);
cout << "The topic has " << metadata.get_partitions().size() << " topics" << endl;