private final String topic;

private final Properties props;

public KafkaExample(String brokers, String username, String password) {

this.topic = username + "-default";

String jaasTemplate = "org.apache.kafka.common.security.scram.ScramLoginModule required username=\"%s\" password=\"%s\";";

String jaasCfg = String.format(jaasTemplate, username, password);

String serializer = StringSerializer.class.getName();

String deserializer = StringDeserializer.class.getName();

props = new Properties();

props.put("bootstrap.servers", brokers);

props.put("group.id", username + "-consumer");

props.put("enable.auto.commit", "true");

props.put("auto.commit.interval.ms", "1000");

props.put("auto.offset.reset", "earliest");

props.put("session.timeout.ms", "30000");

props.put("key.deserializer", deserializer);

props.put("value.deserializer", deserializer);

props.put("key.serializer", serializer);

props.put("value.serializer", serializer);

props.put("security.protocol", "SASL_SSL");

props.put("sasl.mechanism", "SCRAM-SHA-256");

props.put("sasl.jaas.config", jaasCfg);

}

public void consume() {

KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);

consumer.subscribe(Arrays.asList(topic));

while (true) {

ConsumerRecords<String, String> records = consumer.poll(1000);

for (ConsumerRecord<String, String> record : records) {

System.out.printf("%s [%d] offset=%d, key=%s, value=\"%s\"\n",

record.topic(), record.partition(),

record.offset(), record.key(), record.value());

}

}

}

public void produce() {

Thread one = new Thread() {

public void run() {

try {

Producer<String, String> producer = new KafkaProducer<>(props);

int i = 0;

while(true) {

Date d = new Date();

producer.send(new ProducerRecord<>(topic, Integer.toString(i), d.toString()));

Thread.sleep(1000);

i++;

}

} catch (InterruptedException v) {

System.out.println(v);

}

}

};

one.start();

}

public static void main(String[] args) {

String brokers = System.getenv("CLOUDKARAFKA_BROKERS");

String username = System.getenv("CLOUDKARAFKA_USERNAME");

String password = System.getenv("CLOUDKARAFKA_PASSWORD");

KafkaExample c = new KafkaExample(brokers, username, password);

c.produce();

c.consume();

}