1 package de.juplo.kafka;
3 import lombok.extern.slf4j.Slf4j;
4 import org.apache.kafka.clients.producer.KafkaProducer;
5 import org.apache.kafka.clients.producer.ProducerRecord;
6 import org.apache.kafka.common.serialization.StringSerializer;
7 import org.springframework.http.HttpStatus;
8 import org.springframework.kafka.support.serializer.JsonSerializer;
9 import org.springframework.web.bind.annotation.*;
10 import org.springframework.web.context.request.async.DeferredResult;
12 import javax.annotation.PreDestroy;
13 import java.util.Properties;
14 import java.util.concurrent.ExecutionException;
19 public class RestProducer
21 private final String id;
22 private final String topic;
23 private final KafkaProducer<String, Object> producer;
25 private long produced = 0;
27 public RestProducer(ApplicationProperties properties)
29 this.id = properties.getClientId();
30 this.topic = properties.getTopic();
32 Properties props = new Properties();
33 props.put("bootstrap.servers", properties.getBootstrapServer());
34 props.put("client.id", properties.getClientId());
35 props.put("acks", properties.getAcks());
36 props.put("batch.size", properties.getBatchSize());
37 props.put("delivery.timeout.ms", 20000); // 20 Sekunden
38 props.put("request.timeout.ms", 10000); // 10 Sekunden
39 props.put("linger.ms", properties.getLingerMs());
40 props.put("compression.type", properties.getCompressionType());
41 props.put("key.serializer", StringSerializer.class.getName());
42 props.put("value.serializer", JsonSerializer.class.getName());
43 props.put(JsonSerializer.TYPE_MAPPINGS,
44 "message:" + ClientMessage.class.getName() + "," +
45 "greeting:" + Greeting.class.getName());
47 this.producer = new KafkaProducer<>(props);
50 @PostMapping(path = "{key}")
51 public DeferredResult<ProduceResult> message(
52 @PathVariable String key,
53 @RequestBody String value)
55 final ProducerRecord<String, Object> record = new ProducerRecord<>(
58 new ClientMessage(key, value) // Value
64 @PostMapping(path = "/")
65 public DeferredResult<ProduceResult> greeting(
66 @RequestBody String name)
68 final ProducerRecord<String, Object> record = new ProducerRecord<>(
71 new Greeting(name) // Value
77 private DeferredResult<ProduceResult> send(ProducerRecord<String, Object> record)
79 DeferredResult<ProduceResult> result = new DeferredResult<>();
81 final long time = System.currentTimeMillis();
83 producer.send(record, (metadata, e) ->
85 long now = System.currentTimeMillis();
90 result.setResult(new ProduceSuccess(metadata.partition(), metadata.offset()));
92 "{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
105 result.setErrorResult(new ProduceFailure(e));
107 "{} - ERROR key={} timestamp={} latency={}ms: {}",
110 metadata == null ? -1 : metadata.timestamp(),
117 long now = System.currentTimeMillis();
119 "{} - Queued key={} latency={}ms",
129 @ResponseStatus(HttpStatus.BAD_REQUEST)
130 public ErrorResponse illegalStateException(IllegalStateException e)
132 return new ErrorResponse(e.getMessage(), HttpStatus.BAD_REQUEST.value());
136 public void destroy() throws ExecutionException, InterruptedException
138 log.info("{} - Destroy!", id);
139 log.info("{} - Closing the KafkaProducer", id);
141 log.info("{}: Produced {} messages in total, exiting!", id, produced);