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.http.MediaType;
+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;
-import java.util.concurrent.ExecutorService;
@Slf4j
{
private final String id;
private final String topic;
- private final KafkaProducer<String, String> 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", StringSerializer.class.getName());
-
- this.producer = new KafkaProducer<>(props);
+ this.kafkaTemplate = kafkaTemplate;
}
@PostMapping(path = "{key}")
- public DeferredResult<ProduceResult> send(
+ public DeferredResult<ProduceResult> message(
@PathVariable String key,
@RequestBody String value)
{
- DeferredResult<ProduceResult> result = new DeferredResult<>();
+ key = key.trim();
+ final ProducerRecord<String, Object> record = new ProducerRecord<>(
+ topic, // Topic
+ key, // Key
+ new ClientMessage(key, value) // Value
+ );
- final long time = System.currentTimeMillis();
+ return send(record);
+ }
- final ProducerRecord<String, String> record = new ProducerRecord<>(
+ @PutMapping(path = "{key}")
+ public DeferredResult<ProduceResult> message(@PathVariable String key)
+ {
+ key = key.trim();
+ final ProducerRecord<String, Object> record = new ProducerRecord<>(
topic, // Topic
key, // Key
- value // Value
+ new FooMessage(key, System.currentTimeMillis()) // Value
);
- producer.send(record, (metadata, e) ->
- {
- long now = System.currentTimeMillis();
- if (e == null)
+ return send(record);
+ }
+
+ @PostMapping(path = "/")
+ public DeferredResult<ProduceResult> greeting(
+ @RequestBody String name)
+ {
+ name = name.trim();
+ final ProducerRecord<String, Object> record = new ProducerRecord<>(
+ topic, // Topic
+ name, // Key
+ new Greeting(name) // Value
+ );
+
+ return send(record);
+ }
+
+ private DeferredResult<ProduceResult> send(ProducerRecord<String, Object> record)
+ {
+ DeferredResult<ProduceResult> result = new DeferredResult<>();
+
+ final long time = System.currentTimeMillis();
+
+ kafkaTemplate.send(record).addCallback(
+ (sendResult) ->
{
+ long now = System.currentTimeMillis();
+
// HANDLE SUCCESS
+ RecordMetadata metadata = sendResult.getRecordMetadata();
produced++;
result.setResult(new ProduceSuccess(metadata.partition(), metadata.offset()));
log.debug(
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(),
now - time,
e.toString()
);
- }
- });
+ });
long now = System.currentTimeMillis();
log.trace(
- "{} - Queued #{} key={} latency={}ms",
+ "{} - Queued key={} latency={}ms",
id,
- value,
record.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);
}
}