import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.TopicPartition;
-import org.apache.kafka.common.errors.WakeupException;
+import org.apache.kafka.common.serialization.BytesDeserializer;
import org.apache.kafka.common.serialization.BytesSerializer;
import org.apache.kafka.common.serialization.LongSerializer;
import org.apache.kafka.common.serialization.StringSerializer;
import org.apache.kafka.common.utils.Bytes;
-import org.junit.jupiter.api.MethodOrderer;
-import org.junit.jupiter.api.Order;
-import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.TestMethodOrder;
+import org.junit.jupiter.api.*;
import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration;
import org.springframework.boot.test.context.ConfigDataApplicationContextInitializer;
import org.springframework.boot.test.context.TestConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;
+import org.springframework.context.annotation.Primary;
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.util.*;
-import java.util.concurrent.ExecutorService;
+import java.util.concurrent.ExecutionException;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;
import static de.juplo.kafka.ApplicationTests.PARTITIONS;
import static de.juplo.kafka.ApplicationTests.TOPIC;
import static org.assertj.core.api.Assertions.assertThat;
+import static org.awaitility.Awaitility.*;
-@SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
+@SpringJUnitConfig(
+ initializers = ConfigDataApplicationContextInitializer.class,
+ classes = {
+ EndlessConsumer.class,
+ KafkaAutoConfiguration.class,
+ ApplicationTests.Configuration.class })
@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
@TestPropertySource(
properties = {
@Autowired
KafkaProducer<String, Bytes> kafkaProducer;
@Autowired
- KafkaConsumer<String, Long> kafkaConsumer;
+ KafkaConsumer<Bytes, Bytes> offsetConsumer;
@Autowired
ApplicationProperties properties;
@Autowired
- ExecutorService executor;
+ EndlessConsumer endlessConsumer;
+ @Autowired
+ RecordHandler recordHandler;
+
+ Map<TopicPartition, Long> oldOffsets;
+ Map<TopicPartition, Long> newOffsets;
+
+ /** Tests methods */
@Test
@Order(1) // << The poistion pill is not skipped. Hence, this test must run first
- void commitsCurrentOffsetsOnSuccess()
+ void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
{
send100Messages(i -> new Bytes(longSerializer.serialize(TOPIC, i)));
Set<ConsumerRecord<String, Long>> received = new HashSet<>();
- Map<Integer, Long> offsets = runEndlessConsumer(record ->
- {
- received.add(record);
- if (received.size() == 100)
- throw new WakeupException();
- });
+ recordHandler.testHandler = record -> received.add(record);
- check(offsets);
+ await("100 records received")
+ .atMost(Duration.ofSeconds(30))
+ .until(() -> received.size() >= 100);
+
+ await("Offsets committed")
+ .atMost(Duration.ofSeconds(10))
+ .untilAsserted(() ->
+ {
+ checkSeenOffsetsForProgress();
+ compareToCommitedOffsets(newOffsets);
+ });
}
@Test
@Order(2)
- void commitsNoOffsetsOnError()
+ void commitsOffsetOfErrorForReprocessingOnError()
{
send100Messages(counter ->
counter == 77
? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
: new Bytes(longSerializer.serialize(TOPIC, counter)));
- Map<Integer, Long> oldOffsets = new HashMap<>();
- doForCurrentOffsets((tp, offset) -> oldOffsets.put(tp.partition(), offset -1));
- Map<Integer, Long> newOffsets = runEndlessConsumer((record) -> {});
+ await("Consumer failed")
+ .atMost(Duration.ofSeconds(30))
+ .untilAsserted(() -> checkSeenOffsetsForProgress());
+
+ compareToCommitedOffsets(newOffsets);
+ }
+
+
+ /** Helper methods for the verification of expectations */
+
+ void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
+ {
+ doForCurrentOffsets((tp, offset) ->
+ {
+ Long expected = offsetsToCheck.get(tp) + 1;
+ log.debug("Checking, if the offset for {} is {}", tp, expected);
+ assertThat(offset).isEqualTo(expected);
+ });
+ }
+
+ void checkSeenOffsetsForProgress()
+ {
+ // Be sure, that some messages were consumed...!
+ Set<TopicPartition> withProgress = new HashSet<>();
+ partitions().forEach(tp ->
+ {
+ Long oldOffset = oldOffsets.get(tp);
+ Long newOffset = newOffsets.get(tp);
+ if (!oldOffset.equals(newOffset))
+ {
+ log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
+ withProgress.add(tp);
+ }
+ });
+ assertThat(withProgress).isNotEmpty().describedAs("Found no partitions with any offset-progress");
+ }
+
+
+ /** Helper methods for setting up and running the tests */
+
+ void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
+ {
+ offsetConsumer.assign(partitions());
+ partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
+ offsetConsumer.unsubscribe();
+ }
- check(oldOffsets);
+ List<TopicPartition> partitions()
+ {
+ return
+ IntStream
+ .range(0, PARTITIONS)
+ .mapToObj(partition -> new TopicPartition(TOPIC, partition))
+ .collect(Collectors.toList());
}
}
}
- Map<Integer, Long> runEndlessConsumer(Consumer<ConsumerRecord<String, Long>> consumer)
- {
- Map<Integer, Long> offsets = new HashMap<>();
- doForCurrentOffsets((tp, offset) -> offsets.put(tp.partition(), offset -1));
- Consumer<ConsumerRecord<String, Long>> captureOffset = record -> offsets.put(record.partition(), record.offset());
- EndlessConsumer<String, Long> endlessConsumer =
- new EndlessConsumer<>(
- executor,
- properties.getClientId(),
- properties.getTopic(),
- kafkaConsumer,
- captureOffset.andThen(consumer));
-
- endlessConsumer.run();
-
- return offsets;
- }
- List<TopicPartition> partitions()
+ @BeforeEach
+ public void init()
{
- return
- IntStream
- .range(0, PARTITIONS)
- .mapToObj(partition -> new TopicPartition(TOPIC, partition))
- .collect(Collectors.toList());
+ recordHandler.testHandler = (record) -> {};
+
+ oldOffsets = new HashMap<>();
+ newOffsets = new HashMap<>();
+
+ doForCurrentOffsets((tp, offset) ->
+ {
+ oldOffsets.put(tp, offset - 1);
+ newOffsets.put(tp, offset - 1);
+ });
+
+ recordHandler.captureOffsets =
+ record ->
+ newOffsets.put(
+ new TopicPartition(record.topic(), record.partition()),
+ record.offset());
+
+ endlessConsumer.start();
}
- void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
+ @AfterEach
+ public void deinit()
{
- kafkaConsumer.assign(partitions());
- partitions().forEach(tp -> consumer.accept(tp, kafkaConsumer.position(tp)));
- kafkaConsumer.unsubscribe();
+ try
+ {
+ endlessConsumer.stop();
+ }
+ catch (Exception e)
+ {
+ log.info("Exception while stopping the consumer: {}", e.toString());
+ }
}
- void check(Map<Integer, Long> offsets)
+ public static class RecordHandler implements Consumer<ConsumerRecord<String, Long>>
{
- doForCurrentOffsets((tp, offset) ->
+ Consumer<ConsumerRecord<String, Long>> captureOffsets;
+ Consumer<ConsumerRecord<String, Long>> testHandler;
+
+
+ @Override
+ public void accept(ConsumerRecord<String, Long> record)
{
- Long expected = offsets.get(tp.partition()) + 1;
- log.debug("Checking, if the offset for {} is {}", tp, expected);
- assertThat(offset).isEqualTo(expected);
- });
+ captureOffsets
+ .andThen(testHandler)
+ .accept(record);
+ }
}
-
@TestConfiguration
@Import(ApplicationConfiguration.class)
public static class Configuration
{
+ @Primary
+ @Bean
+ public Consumer<ConsumerRecord<String, Long>> testHandler()
+ {
+ return new RecordHandler();
+ }
+
@Bean
KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
{
return new KafkaProducer<>(props);
}
+
+ @Bean
+ KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
+ {
+ Properties props = new Properties();
+ props.put("bootstrap.servers", properties.getBootstrapServer());
+ props.put("client.id", "OFFSET-CONSUMER");
+ props.put("group.id", properties.getGroupId());
+ props.put("key.deserializer", BytesDeserializer.class.getName());
+ props.put("value.deserializer", BytesDeserializer.class.getName());
+
+ return new KafkaConsumer<>(props);
+ }
}
}
projects / demos / kafka / training / blobdiff