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.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
-public class EndlessProducer implements Runnable
+@RestController
+public class RestProducer
{
- private final ExecutorService executor;
private final String id;
private final String topic;
- private final int throttleMs;
- private final KafkaProducer<String, String> producer;
+ private final KafkaTemplate<String, Object> kafkaTemplate;
- private boolean running = false;
- private long i = 0;
private long produced = 0;
- public EndlessProducer(
- ExecutorService executor,
- String bootstrapServer,
- String clientId,
- String topic,
- String acks,
- int throttleMs)
+ public RestProducer(
+ ApplicationProperties properties,
+ KafkaTemplate<String, Object> kafkaTemplate)
{
- this.executor = executor;
- this.id = clientId;
- this.topic = topic;
- this.throttleMs = throttleMs;
-
- Properties props = new Properties();
- props.put("bootstrap.servers", bootstrapServer);
- props.put("client.id", clientId);
- props.put("acks", acks);
- props.put("key.serializer", StringSerializer.class.getName());
- props.put("value.serializer", StringSerializer.class.getName());
-
- this.producer = new KafkaProducer<>(props);
+ this.id = properties.getClientId();
+ this.topic = properties.getTopic();
+ this.kafkaTemplate = kafkaTemplate;
}
- @Override
- public void run()
+ @PostMapping(path = "{key}")
+ public DeferredResult<ProduceResult> message(
+ @PathVariable String key,
+ @RequestBody String value)
{
- try
- {
- for (; running; i++)
- {
- send(Long.toString(i%10), Long.toString(i));
-
- if (throttleMs > 0)
- {
- try
- {
- Thread.sleep(throttleMs);
- }
- catch (InterruptedException e)
- {
- log.warn("{} - Interrupted while throttling!", e);
- }
- }
- }
-
- log.info("{} - Done", id);
- }
- catch (Exception e)
- {
- log.error("{} - Unexpected Exception:", id, e);
- }
- finally
- {
- synchronized (this)
- {
- running = false;
- log.info("{} - Stopped - produced {} messages so far", id, produced);
- }
- }
+ key = key.trim();
+ final ProducerRecord<String, Object> record = new ProducerRecord<>(
+ topic, // Topic
+ key, // Key
+ new ClientMessage(key, value) // Value
+ );
+
+ return send(record);
}
- void send(String key, String value)
+ @PutMapping(path = "{key}")
+ public DeferredResult<ProduceResult> message(@PathVariable String key)
{
- final long time = System.currentTimeMillis();
-
- final ProducerRecord<String, String> record = new ProducerRecord<>(
+ key = key.trim();
+ final ProducerRecord<String, Object> record = new ProducerRecord<>(
topic, // Topic
key, // Key
- value // Value
+ new FooMessage(key, System.currentTimeMillis()) // Value
+ );
+
+ 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
);
- producer.send(record, (metadata, e) ->
- {
- long now = System.currentTimeMillis();
- if (e == null)
+ 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(
"{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
id,
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 synchronized void start()
- {
- if (running)
- throw new IllegalStateException("Producer instance " + id + " is already running!");
-
- log.info("{} - Starting - produced {} messages before", id, produced);
- running = true;
- executor.submit(this);
+ return result;
}
- public synchronized void stop() throws ExecutionException, InterruptedException
+ @ExceptionHandler
+ @ResponseStatus(HttpStatus.BAD_REQUEST)
+ public ErrorResponse illegalStateException(IllegalStateException e)
{
- if (!running)
- throw new IllegalStateException("Producer instance " + id + " is not running!");
-
- log.info("{} - Stopping...", id);
- running = false;
+ return new ErrorResponse(e.getMessage(), HttpStatus.BAD_REQUEST.value());
}
@PreDestroy
public void destroy() throws ExecutionException, InterruptedException
{
log.info("{} - Destroy!", id);
- try
- {
- stop();
- }
- catch (IllegalStateException e)
- {
- log.info("{} - Was already stopped", id);
- }
- finally
- {
- log.info("{} - Closing the KafkaProducer", id);
- producer.close();
- log.info("{}: Produced {} messages in total, exiting!", id, produced);
- }
+ log.info("{}: Produced {} messages in total, exiting!", id, produced);
}
}
projects / demos / kafka / training / blobdiff