kafka.entity.changelog.topic.TopicCommandRepository Maven / Gradle / Ivy

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package kafka.entity.changelog.topic;

import java.io.Flushable;
import java.io.IOException;
import kafka.entity.changelog.schema.Topic;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public interface TopicCommandRepository extends Flushable {

  static TopicCommandRepository create(
      Producer commandProducer,
      String commandTopicName) {
    return new DefaultTopicCommandRepository(commandProducer, commandTopicName);
  }

  void put(Topic.Command command);

  @Override default void flush() throws IOException {
    // nothing to flush
  }

  class DefaultTopicCommandRepository implements TopicCommandRepository {
    static final Logger LOG = LoggerFactory.getLogger(DefaultTopicCommandRepository.class);

    final Producer producer;
    final String commandTopicName;

    DefaultTopicCommandRepository(
        Producer producer,
        String commandTopicName) {
      this.producer = producer;
      this.commandTopicName = commandTopicName;
    }

    public void put(Topic.Command command) {
      ProducerRecord record = null;
      if (command.hasTopicsFound()) record = new ProducerRecord<>(commandTopicName, null, command);
      if (command.hasCreateTopic()) record = new ProducerRecord<>(commandTopicName, null, command);
      producer.send(record, (metadata, exception) -> {
        if (exception != null) LOG.error("Error sending topics found", exception);
      });
    }

    @Override public void flush() throws IOException {
      producer.flush();
    }
  }
}