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Kakfa important points

Pragya Keshap answered on February 11, 2023 Popularity 1/10 Helpfulness 1/10

answer Kakfa important points

Kakfa important points

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Kafka is a service bus: To connect heterogeneous applications, we need to implement a message publication mechanism to send and receive messages among them. A message router is known as message broker. Kafka is a message broker, a solution to deal with routing messages among clients in a quick way.

Kafka architecture has two directives: The first is to not block the producers (in order to deal with the back pressure). The second is to isolate producers and consumers. The producers should not know who their consumers are, hence Kafka follows the dumb broker and smart clients model.

Kafka is a real-time messaging system: Moreover, Kafka is a software solution with a publish-subscribe model: open source, distributed, partitioned, replicated, and commit-log-based.

public final class Enricher implements Producer {

  private final KafkaProducer<String, String> producer;
  private final String validMessages;
  private final String invalidMessages;
  private static final ObjectMapper MAPPER = new ObjectMapper();

  public Enricher(String servers, String validMessages, String invalidMessages) {
    this.producer = new KafkaProducer<>(Producer.createConfig(servers));
    this.validMessages = validMessages;
    this.invalidMessages = invalidMessages;
  }

  @Override
  public void process(String message) {
    try {
      final JsonNode root = MAPPER.readTree(message);
      final JsonNode ipAddressNode = root.path("customer").path("ipAddress");

      if (ipAddressNode.isMissingNode()) {                               //1
        Producer.write(this.producer, this.invalidMessages,
            "{\"error\": \"customer.ipAddress is missing\"}");
      } else {
        final String ipAddress = ipAddressNode.textValue();

        final Location location = new GeoIPService().getLocation(ipAddress);
        ((ObjectNode) root).with("customer").put("country", location.countryName);
        ((ObjectNode) root).with("customer").put("city", location.city);

        final OpenExchangeService oes = new OpenExchangeService();                            //2
        ((ObjectNode) root).with("currency").put("rate", oes.getPrice("BTC"));                                                     //3

        Producer.write(this.producer, this.validMessages, MAPPER.writeValueAsString(root)); //4
      }
    } catch (IOException e) {
      Producer.write(this.producer, this.invalidMessages, "{\"error\": \""
          + e.getClass().getSimpleName() + ": " + e.getMessage() + "\"}");
    }
  }
}

https://data-flair.training/blogs/apache-kafka-features/

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java points

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Contributed on Feb 11 2023

Pragya Keshap

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