Cassandra cassandraClient;
cassandraClient.connect();

auto task = cassandraClient.executeQuery(
    "SELECT * FROM my_table WHERE key = 'user_id_1'"
);

task.wait_for(std::chrono::milliseconds(1000));

if (task.is_ready() && task.has_value()) {
    auto rows = task.value();
    for (auto&& row : rows) {
        std::cout << row << "\n";
    }
}

KafkaProducer kafkaProducer;
kafkaProducer.connect();

auto task = kafkaProducer.produce(
    "my-topic",
    "payload_value_1"
);

task.wait_for(std::chrono::milliseconds(1000));

if (task.is_ready()) {
    std::cout << "Message produced successfully.\n";
}

Hadoop hadoopClient;
hadoopClient.connect();

auto task = hadoopClient.processMapReduce(
    "map_job",
    "reduce_job",
    "input_file",
    "output_file"
);

task.wait_for(std::chrono::minutes(5));

if (task.is_ready() && task.has_value()) {
    auto result = task.value();
    std::cout << "Processing result:\n";
    for (auto&& row : result) {
        std::cout << row << "\n";
    }
}