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Multi-Method Listeners

Pragya Keshap answered on February 11, 2023 Popularity 3/10 Helpfulness 1/10

answer Multi-Method Listeners

Multi-Method Listeners

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We can configure our application to send various kinds of objects to the same topic and then consume them.

public class Farewell {

    private String message;
    private Integer remainingMinutes;

    // standard getters, setters and constructor
}
configProps.put(JsonSerializer.TYPE_MAPPINGS, "greeting:com.baeldung.spring.kafka.Greeting, farewell:com.baeldung.spring.kafka.Farewell");
@Bean
public ProducerFactory<String, Object> multiTypeProducerFactory() {
    Map<String, Object> configProps = new HashMap<>();
    configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
    configProps.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
    configProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, JsonSerializer.class);
    configProps.put(JsonSerializer.TYPE_MAPPINGS, 
      "greeting:com.baeldung.spring.kafka.Greeting, farewell:com.baeldung.spring.kafka.Farewell");
    return new DefaultKafkaProducerFactory<>(configProps);
}

@Bean
public KafkaTemplate<String, Object> multiTypeKafkaTemplate() {
    return new KafkaTemplate<>(multiTypeProducerFactory());
}
multiTypeKafkaTemplate.send(multiTypeTopicName, new Greeting("Greetings", "World!"));
multiTypeKafkaTemplate.send(multiTypeTopicName, new Farewell("Farewell", 25));
multiTypeKafkaTemplate.send(multiTypeTopicName, "Simple string message");

https://www.baeldung.com/spring-kafka#4-adding-message-filter-for-listeners

Popularity 3/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java listeners

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Contributed on Feb 11 2023

Pragya Keshap

0 Answers Avg Quality 2/10

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