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Fast and reliable message broker built on top of Kafka.

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package pl.allegro.tech.hermes.common.kafka;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.Optional;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.stream.Stream;

public class KafkaTopics {

  private final KafkaTopic primary;
  private final Optional secondary;

  public KafkaTopics(KafkaTopic primary) {
    this.primary = checkNotNull(primary);
    this.secondary = Optional.empty();
  }

  public KafkaTopics(KafkaTopic primary, KafkaTopic secondary) {
    this.primary = checkNotNull(primary);
    this.secondary = Optional.of(secondary);
  }

  public KafkaTopic getPrimary() {
    return primary;
  }

  public Optional getSecondary() {
    return secondary;
  }

  public void forEach(Consumer consumer) {
    consumer.accept(primary);
    secondary.ifPresent(consumer);
  }

  public boolean allMatch(Function matcher) {
    return matcher.apply(primary) && secondary.map(matcher).orElse(true);
  }

  public Stream stream() {
    return secondary.map(secondary -> Stream.of(primary, secondary)).orElse(Stream.of(primary));
  }
}