import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.KafkaConsumer;
-import org.apache.kafka.common.serialization.LongDeserializer;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
+import org.springframework.kafka.support.serializer.JsonDeserializer;
import java.util.Properties;
import java.util.concurrent.ExecutorService;
public class ApplicationConfiguration
{
@Bean
- public Consumer<ConsumerRecord<String, Long>> consumer()
+ public Consumer<ConsumerRecord<String, ValidMessage>> consumer()
{
return (record) ->
{
}
@Bean
- public EndlessConsumer<String, Long> endlessConsumer(
- KafkaConsumer<String, Long> kafkaConsumer,
+ public EndlessConsumer<String, ValidMessage> endlessConsumer(
+ KafkaConsumer<String, ValidMessage> kafkaConsumer,
ExecutorService executor,
- Consumer<ConsumerRecord<String, Long>> handler,
+ Consumer<ConsumerRecord<String, ValidMessage>> handler,
ApplicationProperties properties)
{
return
}
@Bean(destroyMethod = "close")
- public KafkaConsumer<String, Long> kafkaConsumer(ApplicationProperties properties)
+ public KafkaConsumer<String, ValidMessage> kafkaConsumer(ApplicationProperties properties)
{
Properties props = new Properties();
props.put("group.id", properties.getGroupId());
props.put("client.id", properties.getClientId());
props.put("auto.offset.reset", properties.getAutoOffsetReset());
+ props.put("auto.commit.interval.ms", (int)properties.getCommitInterval().toMillis());
props.put("metadata.max.age.ms", "1000");
props.put("key.deserializer", StringDeserializer.class.getName());
- props.put("value.deserializer", LongDeserializer.class.getName());
+ props.put("value.deserializer", JsonDeserializer.class.getName());
+ props.put(JsonDeserializer.TYPE_MAPPINGS,
+ "message:" + ClientMessage.class.getName() + "," +
+ "greeting:" + Greeting.class.getName());
+ props.put(JsonDeserializer.TRUSTED_PACKAGES, "de.juplo.kafka");
return new KafkaConsumer<>(props);
}
import org.springframework.boot.test.context.TestConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;
+import org.springframework.kafka.support.serializer.JsonSerializer;
import org.springframework.kafka.test.context.EmbeddedKafka;
import org.springframework.test.context.TestPropertySource;
import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
import java.time.Duration;
+import java.time.LocalDateTime;
import java.util.*;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
@TestPropertySource(
properties = {
"consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
- "consumer.topic=" + TOPIC })
+ "consumer.topic=" + TOPIC,
+ "consumer.commit-interval=1s" })
@EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
@Slf4j
class ApplicationTests
@Autowired
KafkaProducer<String, Bytes> kafkaProducer;
@Autowired
- KafkaConsumer<String, Long> kafkaConsumer;
+ KafkaConsumer<String, ValidMessage> kafkaConsumer;
@Autowired
KafkaConsumer<Bytes, Bytes> offsetConsumer;
@Autowired
@Autowired
ExecutorService executor;
- Consumer<ConsumerRecord<String, Long>> testHandler;
- EndlessConsumer<String, Long> endlessConsumer;
+ Consumer<ConsumerRecord<String, ValidMessage>> testHandler;
+ EndlessConsumer<String, ValidMessage> endlessConsumer;
Map<TopicPartition, Long> oldOffsets;
Map<TopicPartition, Long> newOffsets;
- Set<ConsumerRecord<String, Long>> receivedRecords;
+ Set<ConsumerRecord<String, ValidMessage>> receivedRecords;
/** Tests methods */
@Test
- @Order(1) // << The poistion pill is not skipped. Hence, this test must run first
void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
{
send100Messages((partition, key, counter) ->
{
- Bytes value = new Bytes(valueSerializer.serialize(TOPIC, counter));
- return new ProducerRecord<>(TOPIC, partition, key, value);
+ Bytes value;
+ String type;
+
+ if (counter%3 != 0)
+ {
+ value = serializeClientMessage(key, counter);
+ type = "message";
+ }
+ else {
+ value = serializeGreeting(key, counter);
+ type = "greeting";
+ }
+
+ return toRecord(partition, key, value, type);
});
await("100 records received")
.atMost(Duration.ofSeconds(30))
+ .pollInterval(Duration.ofSeconds(1))
.until(() -> receivedRecords.size() >= 100);
await("Offsets committed")
.atMost(Duration.ofSeconds(10))
+ .pollInterval(Duration.ofSeconds(1))
.untilAsserted(() ->
{
checkSeenOffsetsForProgress();
}
@Test
- @Order(2)
- void commitsOffsetOfErrorForReprocessingOnError()
+ void commitsOffsetOfErrorForReprocessingOnDeserializationError()
{
send100Messages((partition, key, counter) ->
{
- Bytes value = counter == 77
- ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
- : new Bytes(valueSerializer.serialize(TOPIC, counter));
- return new ProducerRecord<>(TOPIC, partition, key, value);
+ Bytes value;
+ String type;
+
+ if (counter == 77)
+ {
+ value = serializeFooMessage(key, counter);
+ type = "foo";
+ }
+ else
+ {
+ if (counter%3 != 0)
+ {
+ value = serializeClientMessage(key, counter);
+ type = "message";
+ }
+ else {
+ value = serializeGreeting(key, counter);
+ type = "greeting";
+ }
+ }
+
+ return toRecord(partition, key, value, type);
});
await("Consumer failed")
.atMost(Duration.ofSeconds(30))
+ .pollInterval(Duration.ofSeconds(1))
.until(() -> !endlessConsumer.running());
checkSeenOffsetsForProgress();
endlessConsumer.start();
await("Consumer failed")
.atMost(Duration.ofSeconds(30))
+ .pollInterval(Duration.ofSeconds(1))
.until(() -> !endlessConsumer.running());
checkSeenOffsetsForProgress();
Set<TopicPartition> withProgress = new HashSet<>();
partitions().forEach(tp ->
{
- Long oldOffset = oldOffsets.get(tp);
- Long newOffset = newOffsets.get(tp);
+ Long oldOffset = oldOffsets.get(tp) + 1;
+ Long newOffset = newOffsets.get(tp) + 1;
if (!oldOffset.equals(newOffset))
{
log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
/** Helper methods for setting up and running the tests */
+ void seekToEnd()
+ {
+ offsetConsumer.assign(partitions());
+ offsetConsumer.seekToEnd(partitions());
+ partitions().forEach(tp ->
+ {
+ // seekToEnd() works lazily: it only takes effect on poll()/position()
+ Long offset = offsetConsumer.position(tp);
+ log.info("New position for {}: {}", tp, offset);
+ });
+ // The new positions must be commited!
+ offsetConsumer.commitSync();
+ offsetConsumer.unsubscribe();
+ }
+
void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
{
offsetConsumer.assign(partitions());
}
}
+ ProducerRecord<String, Bytes> toRecord(int partition, String key, Bytes value, String type)
+ {
+ ProducerRecord<String, Bytes> record =
+ new ProducerRecord<>(TOPIC, partition, key, value);
+ record.headers().add("__TypeId__", type.getBytes());
+ return record;
+ }
+
+ Bytes serializeClientMessage(String key, Long value)
+ {
+ TestClientMessage message = new TestClientMessage(key, value.toString());
+ return new Bytes(valueSerializer.serialize(TOPIC, message));
+ }
+
+ Bytes serializeGreeting(String key, Long value)
+ {
+ TestGreeting message = new TestGreeting(key, LocalDateTime.now());
+ return new Bytes(valueSerializer.serialize(TOPIC, message));
+ }
+
+ Bytes serializeFooMessage(String key, Long value)
+ {
+ TestFooMessage message = new TestFooMessage(key, value);
+ return new Bytes(valueSerializer.serialize(TOPIC, message));
+ }
@BeforeEach
public void init()
{
testHandler = record -> {} ;
+ seekToEnd();
+
oldOffsets = new HashMap<>();
newOffsets = new HashMap<>();
receivedRecords = new HashSet<>();
newOffsets.put(tp, offset - 1);
});
- Consumer<ConsumerRecord<String, Long>> captureOffsetAndExecuteTestHandler =
+ Consumer<ConsumerRecord<String, ValidMessage>> captureOffsetAndExecuteTestHandler =
record ->
{
newOffsets.put(
public static class Configuration
{
@Bean
- Serializer<Long> serializer()
+ Serializer<ValidMessage> serializer()
{
- return new LongSerializer();
+ return new JsonSerializer<>();
}
@Bean
projects / demos / kafka / training / commitdiff