89 lines
3.6 KiB
Java
89 lines
3.6 KiB
Java
package com.baeldung.kafka.headers;
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import java.time.Duration;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import java.util.Properties;
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import org.apache.kafka.clients.consumer.ConsumerConfig;
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import org.apache.kafka.clients.consumer.ConsumerRecord;
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import org.apache.kafka.clients.consumer.ConsumerRecords;
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import org.apache.kafka.clients.consumer.KafkaConsumer;
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import org.apache.kafka.clients.producer.KafkaProducer;
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import org.apache.kafka.clients.producer.ProducerConfig;
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import org.apache.kafka.clients.producer.ProducerRecord;
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import org.apache.kafka.common.header.Header;
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import org.apache.kafka.common.header.Headers;
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import org.apache.kafka.common.header.internals.RecordHeader;
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import org.apache.kafka.common.serialization.StringDeserializer;
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import org.apache.kafka.common.serialization.StringSerializer;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class KafkaMessageHeaders {
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private static Logger logger = LoggerFactory.getLogger(KafkaMessageHeaders.class);
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private static String TOPIC = "baeldung";
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private static String MESSAGE_KEY = "message";
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private static String MESSAGE_VALUE = "Hello World";
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private static String HEADER_KEY = "website";
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private static String HEADER_VALUE = "baeldung.com";
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private static KafkaProducer<String, String> producer;
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private static KafkaConsumer<String, String> consumer;
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public static void main(String[] args) {
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setup();
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publishMessageWithCustomHeaders();
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consumeMessageWithCustomHeaders();
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}
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private static void consumeMessageWithCustomHeaders() {
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consumer.subscribe(Arrays.asList(TOPIC));
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ConsumerRecords<String, String> records = consumer.poll(Duration.ofMinutes(1));
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for (ConsumerRecord<String, String> record : records) {
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logger.info(record.key());
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logger.info(record.value());
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Headers headers = record.headers();
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for (Header header : headers) {
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logger.info(header.key());
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logger.info(new String(header.value()));
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}
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}
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}
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private static void publishMessageWithCustomHeaders() {
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List<Header> headers = new ArrayList<>();
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headers.add(new RecordHeader(HEADER_KEY, HEADER_VALUE.getBytes()));
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ProducerRecord<String, String> record1 = new ProducerRecord<>(TOPIC, null, MESSAGE_KEY, MESSAGE_VALUE, headers);
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producer.send(record1);
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ProducerRecord<String, String> record2 = new ProducerRecord<>(TOPIC, null, System.currentTimeMillis(), MESSAGE_KEY, MESSAGE_VALUE, headers);
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producer.send(record2);
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}
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private static void setup() {
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Properties producerProperties = new Properties();
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producerProperties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
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producerProperties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
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producerProperties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
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Properties consumerProperties = new Properties();
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consumerProperties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
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consumerProperties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
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consumerProperties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
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consumerProperties.put(ConsumerConfig.GROUP_ID_CONFIG, "ConsumerGroup1");
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producer = new KafkaProducer<>(producerProperties);
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consumer = new KafkaConsumer<>(consumerProperties);
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}
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}
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