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Publishing Messages

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

answer Publishing Messages

Publishing Messages

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We can send messages using the KafkaTemplate class:

The send API returns a ListenableFuture object. If we want to block the sending thread and get the result about the sent message, we can call the get API of the ListenableFuture object. The thread will wait for the result, but it will slow down the producer.

Kafka is a fast-stream processing platform. Therefore, it's better to handle the results asynchronously so that the subsequent messages do not wait for the result of the previous message.

We can do this through a callback:

@Autowired
private KafkaTemplate<String, String> kafkaTemplate;

public void sendMessage(String msg) {
    kafkaTemplate.send(topicName, msg);
}
public void sendMessage(String message) {
            
    ListenableFuture<SendResult<String, String>> future = 
      kafkaTemplate.send(topicName, message);
	
    future.addCallback(new ListenableFutureCallback<SendResult<String, String>>() {

        @Override
        public void onSuccess(SendResult<String, String> result) {
            System.out.println("Sent message=[" + message + 
              "] with offset=[" + result.getRecordMetadata().offset() + "]");
        }
        @Override
        public void onFailure(Throwable ex) {
            System.out.println("Unable to send message=[" 
              + message + "] due to : " + ex.getMessage());
        }
    });
}

https://www.baeldung.com/spring-kafka

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java

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Contributed on Feb 11 2023

Pragya Keshap

0 Answers Avg Quality 2/10

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