package de.juplo.kafka;
+import lombok.RequiredArgsConstructor;
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.springframework.http.MediaType;
+import org.springframework.http.HttpStatus;
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;
-import java.util.concurrent.ExecutorService;
+import java.math.BigInteger;
@Slf4j
-@RestController
+@RequestMapping
+@ResponseBody
+@RequiredArgsConstructor
public class RestProducer
{
private final String id;
private final String topic;
- private final KafkaProducer<String, String> producer;
+ private final Integer partition;
+ private final KafkaProducer<String, Object> producer;
private long produced = 0;
- public RestProducer(ApplicationProperties properties)
+ @PostMapping(path = "{key}")
+ public DeferredResult<ProduceResult> send(
+ @PathVariable String key,
+ @RequestHeader(name = "X-id", required = false) Long correlationId,
+ @RequestBody Integer number)
{
- this.id = properties.getClientId();
- this.topic = properties.getTopic();
+ ResultRecorder result = new ResultRecorder(number+1);
- 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", StringSerializer.class.getName());
+ for (int i = 1; i <= number; i++)
+ {
+ send(key, new AddNumberMessage(number, i), correlationId, result);
+ }
+ send(key, new CalculateSumMessage(number), correlationId, result);
- this.producer = new KafkaProducer<>(props);
+ return result.getDeferredResult();
}
- @PostMapping(path = "{key}")
- public DeferredResult<ProduceResult> send(
- @PathVariable String key,
- @RequestBody String value)
+ private void send(
+ String key,
+ Object value,
+ Long correlationId,
+ ResultRecorder result)
{
- DeferredResult<ProduceResult> result = new DeferredResult<>();
-
final long time = System.currentTimeMillis();
- final ProducerRecord<String, String> record = new ProducerRecord<>(
+ final ProducerRecord<String, Object> record = new ProducerRecord<>(
topic, // Topic
+ partition, // Partition
key, // Key
value // Value
);
+ record.headers().add("source", id.getBytes());
+ if (correlationId != null)
+ {
+ record.headers().add("id", BigInteger.valueOf(correlationId).toByteArray());
+ }
+
producer.send(record, (metadata, e) ->
{
long now = System.currentTimeMillis();
if (e == null)
{
// HANDLE SUCCESS
+ result.addSuccess(metadata);
produced++;
- result.setResult(new ProduceSuccess(metadata.partition(), metadata.offset()));
log.debug(
"{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
id,
else
{
// HANDLE ERROR
- result.setErrorResult(new ProduceFailure(e));
+ result.addFailure(e);
log.error(
"{} - ERROR key={} timestamp={} latency={}ms: {}",
id,
long now = System.currentTimeMillis();
log.trace(
- "{} - Queued #{} key={} latency={}ms",
+ "{} - Queued message with key={} latency={}ms",
id,
- value,
record.key(),
now - time
);
-
- return result;
}
- @PreDestroy
- public void destroy() throws ExecutionException, InterruptedException
+ @ExceptionHandler
+ @ResponseStatus(HttpStatus.BAD_REQUEST)
+ public ErrorResponse illegalStateException(IllegalStateException e)
{
- log.info("{} - Destroy!", id);
- log.info("{} - Closing the KafkaProducer", id);
- producer.close();
- log.info("{}: Produced {} messages in total, exiting!", id, produced);
+ return new ErrorResponse(e.getMessage(), HttpStatus.BAD_REQUEST.value());
}
}