package de.juplo.kafka;
import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.producer.KafkaProducer;
-import org.apache.kafka.clients.producer.ProducerRecord;
-import org.apache.kafka.common.serialization.StringSerializer;
+import org.apache.kafka.clients.producer.RecordMetadata;
import org.springframework.http.HttpStatus;
-import org.springframework.kafka.support.serializer.JsonSerializer;
+import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.context.request.async.DeferredResult;
import javax.annotation.PreDestroy;
-import java.util.Properties;
import java.util.concurrent.ExecutionException;
public class RestProducer
{
private final String id;
- private final String topic;
- private final KafkaProducer<String, Object> producer;
+ private final KafkaTemplate<String, Object> kafkaTemplate;
private long produced = 0;
- public RestProducer(ApplicationProperties properties)
+ public RestProducer(
+ ApplicationProperties properties,
+ KafkaTemplate<String, Object> kafkaTemplate)
{
this.id = properties.getClientId();
- this.topic = properties.getTopic();
-
- Properties props = new Properties();
- props.put("bootstrap.servers", properties.getBootstrapServer());
- props.put("client.id", properties.getClientId());
- props.put("acks", properties.getAcks());
- props.put("batch.size", properties.getBatchSize());
- props.put("delivery.timeout.ms", 20000); // 20 Sekunden
- props.put("request.timeout.ms", 10000); // 10 Sekunden
- props.put("linger.ms", properties.getLingerMs());
- props.put("compression.type", properties.getCompressionType());
- props.put("key.serializer", StringSerializer.class.getName());
- props.put("value.serializer", JsonSerializer.class.getName());
- props.put(JsonSerializer.TYPE_MAPPINGS,
- "message:" + ClientMessage.class.getName() + "," +
- "foo:" + FooMessage.class.getName() + "," +
- "greeting:" + Greeting.class.getName());
-
- this.producer = new KafkaProducer<>(props);
+ this.kafkaTemplate = kafkaTemplate;
}
@PostMapping(path = "{key}")
@RequestBody String value)
{
key = key.trim();
- final ProducerRecord<String, Object> record = new ProducerRecord<>(
- topic, // Topic
- key, // Key
- new ClientMessage(key, value) // Value
- );
-
- return send(record);
+ return send(key, new ClientMessage(key, value));
}
@PutMapping(path = "{key}")
public DeferredResult<ProduceResult> message(@PathVariable String key)
{
key = key.trim();
- final ProducerRecord<String, Object> record = new ProducerRecord<>(
- topic, // Topic
- key, // Key
- new FooMessage(key, System.currentTimeMillis()) // Value
- );
-
- return send(record);
+ return send(key, new FooMessage(key, System.currentTimeMillis()));
}
@PostMapping(path = "/")
@RequestBody String name)
{
name = name.trim();
- final ProducerRecord<String, Object> record = new ProducerRecord<>(
- topic, // Topic
- name, // Key
- new Greeting(name) // Value
- );
-
- return send(record);
+ return send(name, new Greeting(name));
}
- private DeferredResult<ProduceResult> send(ProducerRecord<String, Object> record)
+ private DeferredResult<ProduceResult> send(String key, Object value)
{
DeferredResult<ProduceResult> result = new DeferredResult<>();
final long time = System.currentTimeMillis();
- producer.send(record, (metadata, e) ->
- {
- long now = System.currentTimeMillis();
- if (e == null)
+ kafkaTemplate.sendDefault(key, value).addCallback(
+ (sendResult) ->
{
+ long now = System.currentTimeMillis();
+
// HANDLE SUCCESS
+ RecordMetadata metadata = sendResult.getRecordMetadata();
produced++;
result.setResult(new ProduceSuccess(metadata.partition(), metadata.offset()));
log.debug(
"{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
id,
- record.key(),
- record.value(),
+ key,
+ value,
metadata.partition(),
metadata.offset(),
metadata.timestamp(),
now - time
);
- }
- else
+ },
+ (e) ->
{
+ long now = System.currentTimeMillis();
+
// HANDLE ERROR
result.setErrorResult(new ProduceFailure(e));
log.error(
- "{} - ERROR key={} timestamp={} latency={}ms: {}",
+ "{} - ERROR key={} timestamp=-1 latency={}ms: {}",
id,
- record.key(),
- metadata == null ? -1 : metadata.timestamp(),
+ key,
now - time,
e.toString()
);
- }
- });
+ });
long now = System.currentTimeMillis();
log.trace(
"{} - Queued key={} latency={}ms",
id,
- record.key(),
+ key,
now - time
);
public void destroy() throws ExecutionException, InterruptedException
{
log.info("{} - Destroy!", id);
- log.info("{} - Closing the KafkaProducer", id);
- producer.close();
log.info("{}: Produced {} messages in total, exiting!", id, produced);
}
}