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.kafka.support.serializer.JsonSerializer;
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 KafkaProducer<String, Object> producer;
private long produced = 0;
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());
+ props.put("value.serializer", JsonSerializer.class.getName());
+ props.put(JsonSerializer.TYPE_MAPPINGS,
+ "message:" + ClientMessage.class.getName() + "," +
+ "greeting:" + Greeting.class.getName());
this.producer = new KafkaProducer<>(props);
}
@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<>(
+ @PostMapping(path = "/")
+ public DeferredResult<ProduceResult> greeting(
+ @RequestBody String name)
+ {
+ name = name.trim();
+ final ProducerRecord<String, Object> record = new ProducerRecord<>(
topic, // Topic
- key, // Key
- value // Value
+ 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();
+
producer.send(record, (metadata, e) ->
{
long now = System.currentTimeMillis();
long now = System.currentTimeMillis();
log.trace(
- "{} - Queued #{} key={} latency={}ms",
+ "{} - Queued key={} latency={}ms",
id,
- value,
record.key(),
now - time
);
return result;
}
+ @ExceptionHandler
+ @ResponseStatus(HttpStatus.BAD_REQUEST)
+ public ErrorResponse illegalStateException(IllegalStateException e)
+ {
+ return new ErrorResponse(e.getMessage(), HttpStatus.BAD_REQUEST.value());
+ }
+
@PreDestroy
public void destroy() throws ExecutionException, InterruptedException
{