in src/main/java/com/googlesource/gerrit/plugins/kafka/api/KafkaBrokerApi.java [50:56]
public void receiveAsync(String topic, Consumer<EventMessage> eventConsumer) {
KafkaEventSubscriber subscriber = subscriberProvider.get();
synchronized (subscribers) {
subscribers.add(subscriber);
}
subscriber.subscribe(topic, eventConsumer);
}