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DevSamplePojoKafkaProducer.java
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DevSamplePojoKafkaProducer.java
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package io.github.almogtavor;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.github.almogtavor.model.SamplePojo;
import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.clients.admin.AdminClient;
import org.apache.kafka.clients.admin.AdminClientConfig;
import org.apache.kafka.clients.admin.NewTopic;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.serialization.StringSerializer;
import java.util.*;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
@Slf4j
public class DevSamplePojoKafkaProducer {
public static final short REPLICATION_FACTOR = 1;
public static final int NUM_PARTITIONS = 1;
public static final String TOPIC = "input";
public static final String BOOTSTRAP_SERVERS = "localhost:9093";
private static final Random RANDOM = new Random();
private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
private static String generateRandomName() {
String[] names = {"Paul", "John", "Ringo", "George", "Bob", "Charlie", "Parker"};
return names[RANDOM.nextInt(names.length)];
}
public static void main(String[] args) throws ExecutionException, InterruptedException, TimeoutException {
try (AdminClient adminClient = AdminClient.create(Map.of(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS))) {
Collection<NewTopic> topics = Collections.singletonList(new NewTopic(TOPIC, NUM_PARTITIONS, REPLICATION_FACTOR));
if (!adminClient.listTopics().names().get().contains(TOPIC)) {
adminClient.createTopics(topics).all().get(30, TimeUnit.SECONDS);
}
}
try (
KafkaProducer<String, String> producer = new KafkaProducer<>(
Map.of(
ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,
BOOTSTRAP_SERVERS,
ProducerConfig.CLIENT_ID_CONFIG,
UUID.randomUUID().toString()
),
new StringSerializer(),
new StringSerializer()
);
) {
int numberOfRecords = 10; // Set the number of records you want to generate
for (int i = 0; i < numberOfRecords; i++) {
String id = "ID" + i;
SamplePojo samplePojo = SamplePojo.builder()
.itemId(id)
.name(generateRandomName())
.coolId(UUID.randomUUID().toString())
.age(RANDOM.nextInt(100)) // Random age between 0 and 99
.createdDate(new Date())
.build();
producer.send(new ProducerRecord<>(TOPIC, id, OBJECT_MAPPER.writeValueAsString(samplePojo))).get();
}
log.info("Successfully produced to kafka {} records", numberOfRecords);
} catch (JsonProcessingException e) {
log.error("Could not produce to kafka", e);
}
}
}