cloudurable / reakt-kafka

Reakt Kafka library

Reakt Kafka

This libray adapts Kafka to Reakt promises and streams.

Reakt has promise libraries for Vert.x, Netty, Guava, and Cassandra.

Using Promises with Kafka Producers

final AsyncProducer<Long, String> producer = new AsyncProducer<>(createProducer());
...
producer.send(TOPIC, key, value)
    .catchError(throwable -> {
                System.err.println("Trouble sending record " + throwable.getLocalizedMessage());
                     throwable.printStackTrace(System.err);
    })
    .then(recordMetadata -> {
             System.out.printf("%d %d %s \n", recordMetadata.offset(),
                recordMetadata.partition(), recordMetadata.topic());
    }).invoke();

Using Streams with Kafka Consumers

final StreamConsumer<Long, String> stream = StreamConsumer.subscribe(createConsumer(), TOPIC, result -> {
    result.then(consumerRecords -> {
        System.out.println("Got message " + consumerRecords.count());
        consumerRecords.forEach(record -> {
            countDownLatch.countDown();
        });
        result.request(1); //calls commitAsync
    }).catchError(throwable -> {
        System.err.println("Trouble Getting record " + throwable.getLocalizedMessage());
        throwable.printStackTrace(System.err);
        result.cancel();
    });
});

stream.close();