* Es wurde nur der hinzugefügte Test übernommen.
* Der hinzugefügte Test wurde an das von Spring-Kafka abweichende
Verhalten bei einem Logik-Fehler angepasst: Kafka führt nicht automatisch
Seeks oder einene Commit durch. Da `EndlessConsumer` bei einem
Logik-Fehler explizit ein `unsubscribe()` durchführt, wird kein
Offset-Commit durchgefürt, so dass die alten Offset-Positionen gültig
bleiben.
* Der Test wurde entsprechend umbenannt.
* `RecordGenerator` wurde um einen weiteren Integer-Set erweitert, über
den die Indizes der zu erzeugenden Logik-Fehler gesetzt werden können.
* Der hinzugefügte Test wurde auf die überarbeitete Methode zur Erzeugung
der Test-Nachrichten umgestellt.
* `ApplicationTest` wurde so ergänzt, dass der für den hinzugefügten Test
benötigte Logik-Fehler erzeugt wird.
echo "Waiting for the Kafka-Cluster to become ready..."
docker-compose exec cli cub kafka-ready -b kafka:9092 1 60 > /dev/null 2>&1 || exit 1
docker-compose up setup
-docker-compose up -d producer consumer
+docker-compose up -d
+
+while ! [[ $(http 0:8081/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "Waiting for consumer-1..."; sleep 1; done
+while ! [[ $(http 0:8082/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "Waiting for consumer-2..."; sleep 1; done
+while ! [[ $(http 0:8083/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "Waiting for consumer-3..."; sleep 1; done
+while ! [[ $(http 0:8084/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "Waiting for consumer-4..."; sleep 1; done
+while ! [[ $(http 0:8085/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "Waiting for consumer-5..."; sleep 1; done
+
sleep 5
+
docker-compose exec -T cli bash << 'EOF'
echo "Writing poison pill into topic test..."
# tag::poisonpill[]
echo 'BOOM!' | kafkacat -P -b kafka:9092 -t test
# end::poisonpill[]
EOF
-while [[ $(http 0:8081/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "Consumer is still running..."; sleep 1; done
+
+while [[ $(http 0:8081/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "consumer-1 is still running..."; sleep 1; done
+while [[ $(http 0:8082/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "consumer-2 is still running..."; sleep 1; done
+while [[ $(http 0:8083/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "consumer-3 is still running..."; sleep 1; done
+while [[ $(http 0:8084/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "consumer-4 is still running..."; sleep 1; done
+while [[ $(http 0:8085/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "consumer-5 is still running..."; sleep 1; done
+
http -v :8081/actuator/health
-echo "Restarting consumer"
+echo "Restarting consumer-1"
http -v post :8081/start
-while ! [[ $(http 0:8081/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "Waiting for consumer..."; sleep 1; done
-while [[ $(http 0:8081/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "Consumer is still running..."; sleep 1; done
+
+echo "Waiting for consumer-1 to come up"
+while ! [[ $(http 0:8081/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "Waiting for consumer-1..."; sleep 1; done
+http -v :8081/actuator/health
+
+echo "Waiting for consumer-1 to crash"
+while [[ $(http 0:8081/actuator/health 2> /dev/null) =~ "UP" ]]; do echo "consumer-1 is still running..."; sleep 1; done
http -v :8081/actuator/health
-http -v post :8081/actuator/shutdown
+
docker-compose stop producer
-docker-compose ps
-docker-compose logs --tail=100 consumer
+docker-compose logs --tail=10 consumer-1
+docker-compose logs --tail=10 consumer-2
+docker-compose logs --tail=10 consumer-3
+docker-compose logs --tail=10 consumer-4
+docker-compose logs --tail=10 consumer-5
command: sleep infinity
producer:
- image: juplo/endless-producer:1.0-SNAPSHOT
+ image: juplo/endless-long-producer:1.0-SNAPSHOT
ports:
- 8080:8080
environment:
producer.throttle-ms: 200
- consumer:
+ consumer-1:
image: juplo/endless-consumer:1.0-SNAPSHOT
ports:
- 8081:8080
environment:
server.port: 8080
consumer.bootstrap-server: kafka:9092
- consumer.client-id: my-group
- consumer.client-id: consumer
- consumer.topic: test
+ consumer.client-id: consumer-1
+
+ consumer-2:
+ image: juplo/endless-consumer:1.0-SNAPSHOT
+ ports:
+ - 8082:8080
+ environment:
+ server.port: 8080
+ consumer.bootstrap-server: kafka:9092
+ consumer.client-id: consumer-2
+
+ consumer-3:
+ image: juplo/endless-consumer:1.0-SNAPSHOT
+ ports:
+ - 8083:8080
+ environment:
+ server.port: 8080
+ consumer.bootstrap-server: kafka:9092
+ consumer.client-id: consumer-3
+
+ consumer-4:
+ image: juplo/endless-consumer:1.0-SNAPSHOT
+ ports:
+ - 8084:8080
+ environment:
+ server.port: 8080
+ consumer.bootstrap-server: kafka:9092
+ consumer.client-id: consumer-4
+
+ consumer-5:
+ image: juplo/endless-consumer:1.0-SNAPSHOT
+ ports:
+ - 8085:8080
+ environment:
+ server.port: 8080
+ consumer.bootstrap-server: kafka:9092
+ consumer.client-id: consumer-5
<version>1.0-SNAPSHOT</version>
<name>Endless Consumer: a Simple Consumer-Group that reads and prints the topic and counts the received messages for each key by topic</name>
+ <properties>
+ <java.version>11</java.version>
+ </properties>
+
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
</dependency>
- <dependency>
- <groupId>org.springframework.kafka</groupId>
- <artifactId>spring-kafka</artifactId>
- </dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
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, ValidMessage>> consumer()
+ public Consumer<ConsumerRecord<String, Long>> consumer()
{
return (record) ->
{
}
@Bean
- public EndlessConsumer<String, ValidMessage> endlessConsumer(
- KafkaConsumer<String, ValidMessage> kafkaConsumer,
+ public EndlessConsumer<String, Long> endlessConsumer(
+ KafkaConsumer<String, Long> kafkaConsumer,
ExecutorService executor,
- Consumer<ConsumerRecord<String, ValidMessage>> handler,
+ Consumer<ConsumerRecord<String, Long>> handler,
ApplicationProperties properties)
{
return
}
@Bean(destroyMethod = "close")
- public KafkaConsumer<String, ValidMessage> kafkaConsumer(ApplicationProperties properties)
+ public KafkaConsumer<String, Long> kafkaConsumer(ApplicationProperties properties)
{
Properties props = new Properties();
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", JsonDeserializer.class.getName());
- props.put(JsonDeserializer.TYPE_MAPPINGS,
- "message:" + ClientMessage.class.getName() + "," +
- "greeting:" + Greeting.class.getName());
- props.put(JsonDeserializer.TRUSTED_PACKAGES, "de.juplo.kafka");
+ props.put("value.deserializer", LongDeserializer.class.getName());
return new KafkaConsumer<>(props);
}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.EqualsAndHashCode;
-import lombok.Getter;
-import lombok.Setter;
-import lombok.ToString;
-
-
-@Getter
-@Setter
-@EqualsAndHashCode
-@ToString
-public class ClientMessage extends ValidMessage
-{
- String client;
- String message;
-
- ClientMessage()
- {
- super(Type.CLIENT_MESSAGE);
- }
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.*;
-
-import java.time.LocalDateTime;
-
-
-@Getter
-@Setter
-@EqualsAndHashCode
-@ToString
-public class Greeting extends ValidMessage
-{
- String name;
- LocalDateTime when;
-
- public Greeting()
- {
- super(Type.GREETING);
- }
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.Getter;
-import lombok.RequiredArgsConstructor;
-
-
-@RequiredArgsConstructor
-public abstract class ValidMessage
-{
- enum Type { CLIENT_MESSAGE, GREETING }
-
- @Getter
- private final Type type;
-}
--- /dev/null
+package de.juplo.kafka;
+
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.apache.kafka.common.serialization.LongSerializer;
+import org.apache.kafka.common.serialization.StringSerializer;
+import org.apache.kafka.common.utils.Bytes;
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Primary;
+import org.springframework.test.context.ContextConfiguration;
+
+import java.util.Set;
+import java.util.function.Consumer;
+
+
+@ContextConfiguration(classes = ApplicationTest.Configuration.class)
+public class ApplicationTest extends GenericApplicationTest<String, Long>
+{
+ public ApplicationTest()
+ {
+ super(
+ new RecordGenerator()
+ {
+ final StringSerializer stringSerializer = new StringSerializer();
+ final LongSerializer longSerializer = new LongSerializer();
+
+
+ @Override
+ public void generate(
+ int numberOfMessagesToGenerate,
+ Set<Integer> poisonPills,
+ Set<Integer> logicErrors,
+ Consumer<ProducerRecord<Bytes, Bytes>> messageSender)
+ {
+ int i = 0;
+
+ for (int partition = 0; partition < 10; partition++)
+ {
+ for (int key = 0; key < 10; key++)
+ {
+ if (++i > numberOfMessagesToGenerate)
+ return;
+
+ Bytes value = new Bytes(longSerializer.serialize(TOPIC, (long)i));
+ if (logicErrors.contains(i))
+ {
+ value = new Bytes(longSerializer.serialize(TOPIC, Long.MIN_VALUE));
+ }
+ if (poisonPills.contains(i))
+ {
+ value = new Bytes(stringSerializer.serialize(TOPIC, "BOOM (Poison-Pill)!"));
+ }
+
+ ProducerRecord<Bytes, Bytes> record =
+ new ProducerRecord<>(
+ TOPIC,
+ partition,
+ new Bytes(stringSerializer.serialize(TOPIC,Integer.toString(partition*10+key%2))),
+ value);
+
+ messageSender.accept(record);
+ }
+ }
+ }
+ });
+ }
+
+
+ @TestConfiguration
+ public static class Configuration
+ {
+ @Primary
+ @Bean
+ public Consumer<ConsumerRecord<String, Long>> consumer()
+ {
+ return (record) ->
+ {
+ if (record.value() == Long.MIN_VALUE)
+ throw new RuntimeException("BOOM (Logic-Error)!");
+ };
+ }
+ }
+}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.ConsumerRecord;
-import org.apache.kafka.clients.consumer.KafkaConsumer;
-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.RecordDeserializationException;
-import org.apache.kafka.common.serialization.*;
-import org.apache.kafka.common.utils.Bytes;
-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.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;
-import java.util.function.BiConsumer;
-import java.util.function.Consumer;
-import java.util.stream.Collectors;
-import java.util.stream.IntStream;
-
-import static de.juplo.kafka.ApplicationTests.PARTITIONS;
-import static de.juplo.kafka.ApplicationTests.TOPIC;
-import static org.assertj.core.api.Assertions.*;
-import static org.awaitility.Awaitility.*;
-
-
-@SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
-@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
-@TestPropertySource(
- properties = {
- "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
- "consumer.topic=" + TOPIC,
- "consumer.commit-interval=1s" })
-@EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
-@Slf4j
-class ApplicationTests
-{
- public static final String TOPIC = "FOO";
- public static final int PARTITIONS = 10;
-
-
- StringSerializer stringSerializer = new StringSerializer();
-
- @Autowired
- Serializer valueSerializer;
- @Autowired
- KafkaProducer<String, Bytes> kafkaProducer;
- @Autowired
- KafkaConsumer<String, ValidMessage> kafkaConsumer;
- @Autowired
- KafkaConsumer<Bytes, Bytes> offsetConsumer;
- @Autowired
- ApplicationProperties properties;
- @Autowired
- ExecutorService executor;
-
- Consumer<ConsumerRecord<String, ValidMessage>> testHandler;
- EndlessConsumer<String, ValidMessage> endlessConsumer;
- Map<TopicPartition, Long> oldOffsets;
- Map<TopicPartition, Long> newOffsets;
- Set<ConsumerRecord<String, ValidMessage>> receivedRecords;
-
-
- /** Tests methods */
-
- @Test
- void commitsCurrentOffsetsOnSuccess()
- {
- send100Messages((partition, key, counter) ->
- {
- Bytes value;
- String type;
-
- if (counter%3 != 0)
- {
- value = serializeClientMessage(key, counter);
- type = "message";
- }
- else {
- value = serializeGreeting(key);
- type = "greeting";
- }
-
- return toRecord(partition, key, value, Optional.of(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();
- compareToCommitedOffsets(newOffsets);
- });
-
- assertThatExceptionOfType(IllegalStateException.class)
- .isThrownBy(() -> endlessConsumer.exitStatus())
- .describedAs("Consumer should still be running");
- }
-
- @Test
- void commitsOffsetOfErrorForReprocessingOnDeserializationErrorInvalidMessage()
- {
- send100Messages((partition, key, counter) ->
- {
- Bytes value;
- String type;
-
- if (counter == 77)
- {
- value = serializeFooMessage(key, counter);
- type = null;
- }
- else
- {
- if (counter%3 != 0)
- {
- value = serializeClientMessage(key, counter);
- type = "message";
- }
- else {
- value = serializeGreeting(key);
- type = "greeting";
- }
- }
-
- return toRecord(partition, key, value, Optional.ofNullable(type));
- });
-
- await("Consumer failed")
- .atMost(Duration.ofSeconds(30))
- .pollInterval(Duration.ofSeconds(1))
- .until(() -> !endlessConsumer.running());
-
- checkSeenOffsetsForProgress();
- compareToCommitedOffsets(newOffsets);
-
- endlessConsumer.start();
- await("Consumer failed")
- .atMost(Duration.ofSeconds(30))
- .pollInterval(Duration.ofSeconds(1))
- .until(() -> !endlessConsumer.running());
-
- checkSeenOffsetsForProgress();
- compareToCommitedOffsets(newOffsets);
- assertThat(receivedRecords.size())
- .describedAs("Received not all sent events")
- .isLessThan(100);
-
- assertThatNoException()
- .describedAs("Consumer should not be running")
- .isThrownBy(() -> endlessConsumer.exitStatus());
- assertThat(endlessConsumer.exitStatus())
- .describedAs("Consumer should have exited abnormally")
- .containsInstanceOf(RecordDeserializationException.class);
- }
-
- @Test
- void commitsOffsetOfErrorForReprocessingOnDeserializationErrorOnUnknownMessage()
- {
- send100Messages((partition, key, counter) ->
- {
- 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);
- type = "greeting";
- }
- }
-
- return toRecord(partition, key, value, Optional.of(type));
- });
-
- await("Consumer failed")
- .atMost(Duration.ofSeconds(30))
- .pollInterval(Duration.ofSeconds(1))
- .until(() -> !endlessConsumer.running());
-
- checkSeenOffsetsForProgress();
- compareToCommitedOffsets(newOffsets);
-
- endlessConsumer.start();
- await("Consumer failed")
- .atMost(Duration.ofSeconds(30))
- .pollInterval(Duration.ofSeconds(1))
- .until(() -> !endlessConsumer.running());
-
- checkSeenOffsetsForProgress();
- compareToCommitedOffsets(newOffsets);
- assertThat(receivedRecords.size())
- .describedAs("Received not all sent events")
- .isLessThan(100);
-
- assertThatNoException()
- .describedAs("Consumer should not be running")
- .isThrownBy(() -> endlessConsumer.exitStatus());
- 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 ->
- {
- Long oldOffset = oldOffsets.get(tp) + 1;
- Long newOffset = newOffsets.get(tp) + 1;
- if (!oldOffset.equals(newOffset))
- {
- log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
- withProgress.add(tp);
- }
- });
- assertThat(withProgress)
- .describedAs("Some offsets must have changed, compared to the old offset-positions")
- .isNotEmpty();
- }
-
-
- /** 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());
- 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());
- }
-
-
- public interface RecordGenerator<K, V>
- {
- public ProducerRecord<String, Bytes> generate(int partition, String key, int counter);
- }
-
- void send100Messages(RecordGenerator recordGenerator)
- {
- int i = 0;
-
- for (int partition = 0; partition < 10; partition++)
- {
- for (int key = 0; key < 10; key++)
- {
- ProducerRecord<String, Bytes> record =
- recordGenerator.generate(partition, Integer.toString(partition*10+key%2), ++i);
-
- kafkaProducer.send(record, (metadata, e) ->
- {
- if (metadata != null)
- {
- log.debug(
- "{}|{} - {}={}",
- metadata.partition(),
- metadata.offset(),
- record.key(),
- record.value());
- }
- else
- {
- log.warn(
- "Exception for {}={}: {}",
- record.key(),
- record.value(),
- e.toString());
- }
- });
- }
- }
- }
-
- ProducerRecord<String, Bytes> toRecord(int partition, String key, Bytes value, Optional<String> type)
- {
- ProducerRecord<String, Bytes> record =
- new ProducerRecord<>(TOPIC, partition, key, value);
-
- type.ifPresent(typeId -> record.headers().add("__TypeId__", typeId.getBytes()));
- return record;
- }
-
- Bytes serializeClientMessage(String key, int value)
- {
- TestClientMessage message = new TestClientMessage(key, Integer.toString(value));
- return new Bytes(valueSerializer.serialize(TOPIC, message));
- }
-
- Bytes serializeGreeting(String key)
- {
- TestGreeting message = new TestGreeting(key, LocalDateTime.now());
- return new Bytes(valueSerializer.serialize(TOPIC, message));
- }
-
- Bytes serializeFooMessage(String key, int value)
- {
- TestFooMessage message = new TestFooMessage(key, (long)value);
- return new Bytes(valueSerializer.serialize(TOPIC, message));
- }
-
- @BeforeEach
- public void init()
- {
- testHandler = record -> {} ;
-
- seekToEnd();
-
- 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, ValidMessage>> captureOffsetAndExecuteTestHandler =
- record ->
- {
- 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,
- captureOffsetAndExecuteTestHandler);
-
- endlessConsumer.start();
- }
-
- @AfterEach
- public void deinit()
- {
- try
- {
- endlessConsumer.stop();
- }
- catch (Exception e)
- {
- log.info("Exception while stopping the consumer: {}", e.toString());
- }
- }
-
-
- @TestConfiguration
- @Import(ApplicationConfiguration.class)
- public static class Configuration
- {
- @Bean
- Serializer<ValidMessage> serializer()
- {
- return new JsonSerializer<>();
- }
-
- @Bean
- KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
- {
- Properties props = new Properties();
- props.put("bootstrap.servers", properties.getBootstrapServer());
- props.put("linger.ms", 100);
- props.put("key.serializer", StringSerializer.class.getName());
- props.put("value.serializer", BytesSerializer.class.getName());
-
- 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);
- }
- }
-}
--- /dev/null
+package de.juplo.kafka;
+
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+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.RecordDeserializationException;
+import org.apache.kafka.common.serialization.*;
+import org.apache.kafka.common.utils.Bytes;
+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.context.annotation.Import;
+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.function.BiConsumer;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+import static de.juplo.kafka.GenericApplicationTest.PARTITIONS;
+import static de.juplo.kafka.GenericApplicationTest.TOPIC;
+import static org.assertj.core.api.Assertions.*;
+import static org.awaitility.Awaitility.*;
+
+
+@SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
+@TestPropertySource(
+ properties = {
+ "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
+ "consumer.topic=" + TOPIC,
+ "consumer.commit-interval=1s" })
+@EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
+@Slf4j
+abstract class GenericApplicationTest<K, V>
+{
+ public static final String TOPIC = "FOO";
+ public static final int PARTITIONS = 10;
+
+
+ @Autowired
+ KafkaConsumer<K, V> kafkaConsumer;
+ @Autowired
+ Consumer<ConsumerRecord<K, V>> consumer;
+ @Autowired
+ ApplicationProperties properties;
+ @Autowired
+ ExecutorService executor;
+
+ KafkaProducer<Bytes, Bytes> testRecordProducer;
+ KafkaConsumer<Bytes, Bytes> offsetConsumer;
+ EndlessConsumer<K, V> endlessConsumer;
+ Map<TopicPartition, Long> oldOffsets;
+ Map<TopicPartition, Long> newOffsets;
+ Set<ConsumerRecord<K, V>> receivedRecords;
+
+
+ final RecordGenerator recordGenerator;
+ final Consumer<ProducerRecord<Bytes, Bytes>> messageSender;
+
+ public GenericApplicationTest(RecordGenerator recordGenerator)
+ {
+ this.recordGenerator = recordGenerator;
+ this.messageSender = (record) -> sendMessage(record);
+ }
+
+
+ /** Tests methods */
+
+ @Test
+ void commitsCurrentOffsetsOnSuccess()
+ {
+ recordGenerator.generate(100, Set.of(), Set.of(), messageSender);
+
+ 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();
+ compareToCommitedOffsets(newOffsets);
+ });
+
+ assertThatExceptionOfType(IllegalStateException.class)
+ .isThrownBy(() -> endlessConsumer.exitStatus())
+ .describedAs("Consumer should still be running");
+ }
+
+ @Test
+ void commitsOffsetOfErrorForReprocessingOnDeserializationError()
+ {
+ recordGenerator.generate(100, Set.of(77), Set.of(), messageSender);
+
+ await("Consumer failed")
+ .atMost(Duration.ofSeconds(30))
+ .pollInterval(Duration.ofSeconds(1))
+ .until(() -> !endlessConsumer.running());
+
+ checkSeenOffsetsForProgress();
+ compareToCommitedOffsets(newOffsets);
+
+ endlessConsumer.start();
+ await("Consumer failed")
+ .atMost(Duration.ofSeconds(30))
+ .pollInterval(Duration.ofSeconds(1))
+ .until(() -> !endlessConsumer.running());
+
+ checkSeenOffsetsForProgress();
+ compareToCommitedOffsets(newOffsets);
+ assertThat(receivedRecords.size())
+ .describedAs("Received not all sent events")
+ .isLessThan(100);
+
+ assertThatNoException()
+ .describedAs("Consumer should not be running")
+ .isThrownBy(() -> endlessConsumer.exitStatus());
+ assertThat(endlessConsumer.exitStatus())
+ .describedAs("Consumer should have exited abnormally")
+ .containsInstanceOf(RecordDeserializationException.class);
+ }
+
+ @Test
+ void doesNotCommitOffsetsOnLogicError()
+ {
+ recordGenerator.generate(100, Set.of(), Set.of(77), messageSender);
+
+ await("Consumer failed")
+ .atMost(Duration.ofSeconds(30))
+ .pollInterval(Duration.ofSeconds(1))
+ .until(() -> !endlessConsumer.running());
+
+ checkSeenOffsetsForProgress();
+ compareToCommitedOffsets(oldOffsets);
+
+ endlessConsumer.start();
+ await("Consumer failed")
+ .atMost(Duration.ofSeconds(30))
+ .pollInterval(Duration.ofSeconds(1))
+ .until(() -> !endlessConsumer.running());
+
+ checkSeenOffsetsForProgress();
+ compareToCommitedOffsets(oldOffsets);
+ assertThat(receivedRecords.size())
+ .describedAs("Received not all sent events")
+ .isLessThan(100);
+
+ assertThatNoException()
+ .describedAs("Consumer should not be running")
+ .isThrownBy(() -> endlessConsumer.exitStatus());
+ assertThat(endlessConsumer.exitStatus())
+ .describedAs("Consumer should have exited abnormally")
+ .containsInstanceOf(RuntimeException.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 ->
+ {
+ Long oldOffset = oldOffsets.get(tp) + 1;
+ Long newOffset = newOffsets.get(tp) + 1;
+ if (!oldOffset.equals(newOffset))
+ {
+ log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
+ withProgress.add(tp);
+ }
+ });
+ assertThat(withProgress)
+ .describedAs("Some offsets must have changed, compared to the old offset-positions")
+ .isNotEmpty();
+ }
+
+
+ /** 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());
+ 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());
+ }
+
+
+ public interface RecordGenerator
+ {
+ void generate(
+ int numberOfMessagesToGenerate,
+ Set<Integer> poisonPills,
+ Set<Integer> logicErrors,
+ Consumer<ProducerRecord<Bytes, Bytes>> messageSender);
+ }
+
+ void sendMessage(ProducerRecord<Bytes, Bytes> record)
+ {
+ testRecordProducer.send(record, (metadata, e) ->
+ {
+ if (metadata != null)
+ {
+ log.debug(
+ "{}|{} - {}={}",
+ metadata.partition(),
+ metadata.offset(),
+ record.key(),
+ record.value());
+ }
+ else
+ {
+ log.warn(
+ "Exception for {}={}: {}",
+ record.key(),
+ record.value(),
+ e.toString());
+ }
+ });
+ }
+
+
+ @BeforeEach
+ public void init()
+ {
+ Properties props;
+ props = new Properties();
+ props.put("bootstrap.servers", properties.getBootstrapServer());
+ props.put("linger.ms", 100);
+ props.put("key.serializer", BytesSerializer.class.getName());
+ props.put("value.serializer", BytesSerializer.class.getName());
+ testRecordProducer = new KafkaProducer<>(props);
+
+ 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());
+ offsetConsumer = new KafkaConsumer<>(props);
+
+ seekToEnd();
+
+ oldOffsets = new HashMap<>();
+ newOffsets = new HashMap<>();
+ receivedRecords = new HashSet<>();
+
+ doForCurrentOffsets((tp, offset) ->
+ {
+ oldOffsets.put(tp, offset - 1);
+ newOffsets.put(tp, offset - 1);
+ });
+
+ Consumer<ConsumerRecord<K, V>> captureOffsetAndExecuteTestHandler =
+ record ->
+ {
+ newOffsets.put(
+ new TopicPartition(record.topic(), record.partition()),
+ record.offset());
+ receivedRecords.add(record);
+ consumer.accept(record);
+ };
+
+ endlessConsumer =
+ new EndlessConsumer<>(
+ executor,
+ properties.getClientId(),
+ properties.getTopic(),
+ kafkaConsumer,
+ captureOffsetAndExecuteTestHandler);
+
+ endlessConsumer.start();
+ }
+
+ @AfterEach
+ public void deinit()
+ {
+ try
+ {
+ endlessConsumer.stop();
+ testRecordProducer.close();
+ offsetConsumer.close();
+ }
+ catch (Exception e)
+ {
+ log.info("Exception while stopping the consumer: {}", e.toString());
+ }
+ }
+
+
+ @TestConfiguration
+ @Import(ApplicationConfiguration.class)
+ public static class Configuration
+ {
+ }
+}
+++ /dev/null
-package de.juplo.kafka;
-
-
-import lombok.Value;
-
-
-@Value
-public class TestClientMessage
-{
- private final String client;
- private final String message;
-}
+++ /dev/null
-package de.juplo.kafka;
-
-
-import lombok.Value;
-
-
-@Value
-public class TestFooMessage
-{
- private final String client;
- private final Long timestamp;
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.Value;
-
-import java.time.LocalDateTime;
-
-
-@Value
-public class TestGreeting
-{
- private final String name;
- private final LocalDateTime when;
-}
projects / demos / kafka / training / commitdiff