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.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.utils.Bytes;
-import org.junit.jupiter.api.Test;
-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.test.context.EmbeddedKafka;
-import org.springframework.test.context.TestPropertySource;
-import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+import org.springframework.context.annotation.Primary;
+import org.springframework.test.context.ContextConfiguration;
-import java.util.*;
-import java.util.concurrent.ExecutorService;
-import java.util.function.BiConsumer;
+import java.util.Set;
import java.util.function.Consumer;
-import java.util.function.Function;
-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.assertThat;
-
-@SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
-@TestPropertySource(
- properties = {
- "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
- "consumer.topic=" + TOPIC })
-@EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
-@Slf4j
-class ApplicationTests
+@ContextConfiguration(classes = ApplicationTests.Configuration.class)
+public class ApplicationTests extends GenericApplicationTests<String, Long>
{
- public static final String TOPIC = "FOO";
- public static final int PARTITIONS = 10;
-
-
- StringSerializer stringSerializer = new StringSerializer();
- LongSerializer longSerializer = new LongSerializer();
-
- @Autowired
- KafkaProducer<String, Bytes> kafkaProducer;
- @Autowired
- KafkaConsumer<String, Long> kafkaConsumer;
- @Autowired
- ApplicationProperties properties;
- @Autowired
- ExecutorService executor;
-
-
- @Test
- void commitsCurrentOffsetsOnSuccess()
- {
- 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();
- });
-
- check(offsets);
- }
-
- @Test
- void commitsNoOffsetsOnError()
- {
- 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) -> {});
-
- check(oldOffsets);
- }
-
-
- void send100Messages(Function<Long, Bytes> messageGenerator)
- {
- long i = 0;
-
- for (int partition = 0; partition < 10; partition++)
- {
- for (int key = 0; key < 10; key++)
- {
- Bytes value = messageGenerator.apply(++i);
-
- ProducerRecord<String, Bytes> record =
- new ProducerRecord<>(
- TOPIC,
- partition,
- Integer.toString(key%2),
- value);
-
- 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());
- }
- });
- }
- }
- }
-
- 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()
- {
- return
- IntStream
- .range(0, PARTITIONS)
- .mapToObj(partition -> new TopicPartition(TOPIC, partition))
- .collect(Collectors.toList());
- }
-
- void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
- {
- kafkaConsumer.assign(partitions());
- partitions().forEach(tp -> consumer.accept(tp, kafkaConsumer.position(tp)));
- kafkaConsumer.unsubscribe();
- }
-
- void check(Map<Integer, Long> offsets)
- {
- doForCurrentOffsets((tp, offset) ->
- {
- Long expected = offsets.get(tp.partition()) + 1;
- log.debug("Checking, if the offset for {} is {}", tp, expected);
- assertThat(offset).isEqualTo(expected);
- });
- }
-
-
- @TestConfiguration
- @Import(ApplicationConfiguration.class)
- public static class Configuration
- {
- @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);
- }
- }
+ public ApplicationTests()
+ {
+ super(
+ new RecordGenerator()
+ {
+ final StringSerializer stringSerializer = new StringSerializer();
+ final LongSerializer longSerializer = new LongSerializer();
+
+
+ @Override
+ public void generate(
+ 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 > 100)
+ 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)!");
+ };
+ }
+ }
}
projects / demos / kafka / training / blobdiff