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.BytesSerializer;
-import org.apache.kafka.common.serialization.LongSerializer;
-import org.apache.kafka.common.serialization.StringSerializer;
+import org.apache.kafka.common.errors.RecordDeserializationException;
+import org.apache.kafka.common.serialization.*;
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.test.context.ConfigDataApplicationContextInitializer;
import org.springframework.boot.test.context.TestConfiguration;
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.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
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.*;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertThrows;
@SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
StringSerializer stringSerializer = new StringSerializer();
- LongSerializer longSerializer = new LongSerializer();
+ @Autowired
+ Serializer valueSerializer;
@Autowired
KafkaProducer<String, Bytes> kafkaProducer;
@Autowired
KafkaConsumer<String, Long> kafkaConsumer;
@Autowired
+ KafkaConsumer<Bytes, Bytes> offsetConsumer;
+ @Autowired
ApplicationProperties properties;
@Autowired
ExecutorService executor;
+ Consumer<ConsumerRecord<String, Long>> testHandler;
+ EndlessConsumer<String, Long> endlessConsumer;
+ Map<TopicPartition, Long> oldOffsets;
+ Map<TopicPartition, Long> newOffsets;
+ Set<ConsumerRecord<String, Long>> receivedRecords;
+
+
+ /** 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)));
+ send100Messages(i -> new Bytes(valueSerializer.serialize(TOPIC, i)));
- Map<TopicPartition, Long> oldOffsets = new HashMap<>();
- doForCurrentOffsets((tp, offset) -> oldOffsets.put(tp, offset -1));
- Set<ConsumerRecord<String, Long>> received = new HashSet<>();
- Map<TopicPartition, Long> newOffsets = runEndlessConsumer(record ->
- {
- received.add(record);
- if (received.size() == 100)
- throw new WakeupException();
- });
+ await("100 records received")
+ .atMost(Duration.ofSeconds(30))
+ .until(() -> receivedRecords.size() >= 100);
- 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");
+ await("Offsets committed")
+ .atMost(Duration.ofSeconds(10))
+ .untilAsserted(() ->
+ {
+ checkSeenOffsetsForProgress();
+ compareToCommitedOffsets(newOffsets);
+ });
- check(newOffsets);
+ assertThrows(
+ IllegalStateException.class,
+ () -> endlessConsumer.exitStatus(),
+ "Consumer should still be running");
}
@Test
@Order(2)
- void commitsNoOffsetsOnError()
+ void commitsOffsetOfErrorForReprocessingOnError()
{
send100Messages(counter ->
counter == 77
? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
- : new Bytes(longSerializer.serialize(TOPIC, counter)));
+ : new Bytes(valueSerializer.serialize(TOPIC, counter)));
+
+ await("Consumer failed")
+ .atMost(Duration.ofSeconds(30))
+ .until(() -> !endlessConsumer.running());
+
+ checkSeenOffsetsForProgress();
+ compareToCommitedOffsets(newOffsets);
+
+ endlessConsumer.start();
+ await("Consumer failed")
+ .atMost(Duration.ofSeconds(30))
+ .until(() -> !endlessConsumer.running());
- Map<TopicPartition, Long> oldOffsets = new HashMap<>();
- doForCurrentOffsets((tp, offset) -> oldOffsets.put(tp, offset -1));
- Map<TopicPartition, Long> newOffsets = runEndlessConsumer((record) -> {});
+ checkSeenOffsetsForProgress();
+ compareToCommitedOffsets(newOffsets);
+ assertThat(receivedRecords.size())
+ .describedAs("Received not all sent events")
+ .isLessThan(100);
+ assertDoesNotThrow(
+ () -> endlessConsumer.exitStatus(),
+ "Consumer should not be running");
+ assertThat(endlessConsumer.exitStatus())
+ .describedAs("Consumer should have exited abnormally")
+ .containsInstanceOf(RecordDeserializationException.class);
+ }
+
+
+ /** 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)
+ .describedAs("Committed offset corresponds to the offset of the consumer")
+ .isEqualTo(expected);
+ });
+ }
+
+ void checkSeenOffsetsForProgress()
+ {
+ // Be sure, that some messages were consumed...!
Set<TopicPartition> withProgress = new HashSet<>();
partitions().forEach(tp ->
{
withProgress.add(tp);
}
});
- assertThat(withProgress).isNotEmpty().describedAs("Found no partitions with any offset-progress");
+ assertThat(withProgress)
+ .describedAs("Some offsets must have changed, compared to the old offset-positions")
+ .isNotEmpty();
+ }
+
- check(oldOffsets);
+ /** 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();
+ }
+
+ List<TopicPartition> partitions()
+ {
+ return
+ IntStream
+ .range(0, PARTITIONS)
+ .mapToObj(partition -> new TopicPartition(TOPIC, partition))
+ .collect(Collectors.toList());
}
}
}
- Map<TopicPartition, Long> runEndlessConsumer(Consumer<ConsumerRecord<String, Long>> consumer)
+
+ @BeforeEach
+ public void init()
{
- Map<TopicPartition, Long> offsets = new HashMap<>();
- doForCurrentOffsets((tp, offset) -> offsets.put(tp, offset -1));
- Consumer<ConsumerRecord<String, Long>> captureOffset =
+ testHandler = record -> {} ;
+
+ oldOffsets = new HashMap<>();
+ newOffsets = new HashMap<>();
+ receivedRecords = new HashSet<>();
+
+ doForCurrentOffsets((tp, offset) ->
+ {
+ oldOffsets.put(tp, offset - 1);
+ newOffsets.put(tp, offset - 1);
+ });
+
+ Consumer<ConsumerRecord<String, Long>> captureOffsetAndExecuteTestHandler =
record ->
- offsets.put(
- new TopicPartition(record.topic(), record.partition()),
- record.offset());
- EndlessConsumer<String, Long> endlessConsumer =
+ {
+ newOffsets.put(
+ new TopicPartition(record.topic(), record.partition()),
+ record.offset());
+ receivedRecords.add(record);
+ testHandler.accept(record);
+ };
+
+ endlessConsumer =
new EndlessConsumer<>(
executor,
properties.getClientId(),
properties.getTopic(),
kafkaConsumer,
- captureOffset.andThen(consumer));
-
- endlessConsumer.run();
-
- return offsets;
- }
-
- List<TopicPartition> partitions()
- {
- return
- IntStream
- .range(0, PARTITIONS)
- .mapToObj(partition -> new TopicPartition(TOPIC, partition))
- .collect(Collectors.toList());
- }
+ captureOffsetAndExecuteTestHandler);
- void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
- {
- kafkaConsumer.assign(partitions());
- partitions().forEach(tp -> consumer.accept(tp, kafkaConsumer.position(tp)));
- kafkaConsumer.unsubscribe();
+ endlessConsumer.start();
}
- void check(Map<TopicPartition, Long> offsets)
+ @AfterEach
+ public void deinit()
{
- doForCurrentOffsets((tp, offset) ->
+ try
{
- Long expected = offsets.get(tp) + 1;
- log.debug("Checking, if the offset for {} is {}", tp, expected);
- assertThat(offset).isEqualTo(expected);
- });
+ endlessConsumer.stop();
+ }
+ catch (Exception e)
+ {
+ log.info("Exception while stopping the consumer: {}", e.toString());
+ }
}
@Import(ApplicationConfiguration.class)
public static class Configuration
{
+ @Bean
+ Serializer<Long> serializer()
+ {
+ return new LongSerializer();
+ }
+
@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