juplo.de Git - demos/kafka/training/blob - src/test/java/de/juplo/kafka/ApplicationTests.java

   1 package de.juplo.kafka;
   2
   3 import lombok.extern.slf4j.Slf4j;
   4 import org.apache.kafka.clients.consumer.ConsumerRecord;
   5 import org.apache.kafka.clients.consumer.KafkaConsumer;
   6 import org.apache.kafka.clients.producer.KafkaProducer;
   7 import org.apache.kafka.clients.producer.ProducerRecord;
   8 import org.apache.kafka.common.TopicPartition;
   9 import org.apache.kafka.common.serialization.*;
  10 import org.apache.kafka.common.utils.Bytes;
  11 import org.junit.jupiter.api.*;
  12 import org.springframework.beans.factory.annotation.Autowired;
  13 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
  14 import org.springframework.boot.test.autoconfigure.data.mongo.AutoConfigureDataMongo;
  15 import org.springframework.boot.test.context.ConfigDataApplicationContextInitializer;
  16 import org.springframework.boot.test.context.TestConfiguration;
  17 import org.springframework.context.annotation.Bean;
  18 import org.springframework.context.annotation.Import;
  19 import org.springframework.kafka.test.context.EmbeddedKafka;
  20 import org.springframework.test.context.TestPropertySource;
  21 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
  22
  23 import java.time.Duration;
  24 import java.util.*;
  25 import java.util.concurrent.ExecutionException;
  26 import java.util.concurrent.ExecutorService;
  27 import java.util.function.BiConsumer;
  28 import java.util.stream.Collectors;
  29 import java.util.stream.IntStream;
  30
  31 import static de.juplo.kafka.ApplicationTests.PARTITIONS;
  32 import static de.juplo.kafka.ApplicationTests.TOPIC;
  33 import static org.assertj.core.api.Assertions.*;
  34 import static org.awaitility.Awaitility.*;
  35
  36
  37 @SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
  38 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
  39 @TestPropertySource(
  40                 properties = {
  41                                 "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
  42                                 "consumer.topic=" + TOPIC,
  43                                 "consumer.commit-interval=1s",
  44                                 "spring.mongodb.embedded.version=4.4.13" })
  45 @EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
  46 @EnableAutoConfiguration
  47 @AutoConfigureDataMongo
  48 @Slf4j
  49 class ApplicationTests
  50 {
  51         public static final String TOPIC = "FOO";
  52         public static final int PARTITIONS = 10;
  53
  54
  55         StringSerializer stringSerializer = new StringSerializer();
  56
  57         @Autowired
  58         Serializer valueSerializer;
  59         @Autowired
  60         KafkaProducer<String, Bytes> kafkaProducer;
  61         @Autowired
  62         KafkaConsumer<String, String> kafkaConsumer;
  63         @Autowired
  64         KafkaConsumer<Bytes, Bytes> offsetConsumer;
  65         @Autowired
  66         PartitionStatisticsRepository partitionStatisticsRepository;
  67         @Autowired
  68         ApplicationProperties properties;
  69         @Autowired
  70         ExecutorService executor;
  71         @Autowired
  72         PartitionStatisticsRepository repository;
  73         @Autowired
  74         SumRebalanceListener sumRebalanceListener;
  75         @Autowired
  76         SumRecordHandler sumRecordHandler;
  77
  78         EndlessConsumer<String, String> endlessConsumer;
  79         Map<TopicPartition, Long> oldOffsets;
  80         Map<TopicPartition, Long> newOffsets;
  81         Set<ConsumerRecord<String, String>> receivedRecords;
  82
  83
  84         /** Tests methods */
  85
  86         @Test
  87         void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
  88         {
  89                 send100Messages((partition, key, counter) ->
  90                 {
  91                         Bytes value = new Bytes(valueSerializer.serialize(TOPIC, counter));
  92                         return new ProducerRecord<>(TOPIC, partition, key, value);
  93                 });
  94
  95                 await("100 records received")
  96                                 .atMost(Duration.ofSeconds(30))
  97                                 .pollInterval(Duration.ofSeconds(1))
  98                                 .until(() -> receivedRecords.size() >= 100);
  99
 100                 await("Offsets committed")
 101                                 .atMost(Duration.ofSeconds(10))
 102                                 .pollInterval(Duration.ofSeconds(1))
 103                                 .untilAsserted(() ->
 104                                 {
 105                                         checkSeenOffsetsForProgress();
 106                                         compareToCommitedOffsets(newOffsets);
 107                                 });
 108
 109                 assertThatExceptionOfType(IllegalStateException.class)
 110                                 .isThrownBy(() -> endlessConsumer.exitStatus())
 111                                 .describedAs("Consumer should still be running");
 112         }
 113
 114
 115         /** Helper methods for the verification of expectations */
 116
 117         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 118         {
 119                 doForCurrentOffsets((tp, offset) ->
 120                 {
 121                         Long expected = offsetsToCheck.get(tp) + 1;
 122                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 123                         assertThat(offset)
 124                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 125                                         .isEqualTo(expected);
 126                 });
 127         }
 128
 129         void checkSeenOffsetsForProgress()
 130         {
 131                 // Be sure, that some messages were consumed...!
 132                 Set<TopicPartition> withProgress = new HashSet<>();
 133                 partitions().forEach(tp ->
 134                 {
 135                         Long oldOffset = oldOffsets.get(tp) + 1;
 136                         Long newOffset = newOffsets.get(tp) + 1;
 137                         if (!oldOffset.equals(newOffset))
 138                         {
 139                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 140                                 withProgress.add(tp);
 141                         }
 142                 });
 143                 assertThat(withProgress)
 144                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 145                                 .isNotEmpty();
 146         }
 147
 148
 149         /** Helper methods for setting up and running the tests */
 150
 151         void seekToEnd()
 152         {
 153                 offsetConsumer.assign(partitions());
 154                 partitions().forEach(tp ->
 155                 {
 156                         Long offset = offsetConsumer.position(tp);
 157                         log.info("New position for {}: {}", tp, offset);
 158                         Integer partition = tp.partition();
 159                         StatisticsDocument document =
 160                                         partitionStatisticsRepository
 161                                                         .findById(partition.toString())
 162                                                         .orElse(new StatisticsDocument(partition));
 163                         document.offset = offset;
 164                         partitionStatisticsRepository.save(document);
 165                 });
 166                 offsetConsumer.unsubscribe();
 167         }
 168
 169         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 170         {
 171                 partitions().forEach(tp ->
 172                 {
 173                         String partition = Integer.toString(tp.partition());
 174                         Optional<Long> offset = partitionStatisticsRepository.findById(partition).map(document -> document.offset);
 175                         consumer.accept(tp, offset.orElse(0l));
 176                 });
 177         }
 178
 179         List<TopicPartition> partitions()
 180         {
 181                 return
 182                                 IntStream
 183                                                 .range(0, PARTITIONS)
 184                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 185                                                 .collect(Collectors.toList());
 186         }
 187
 188
 189         public interface RecordGenerator<K, V>
 190         {
 191                 public ProducerRecord<String, Bytes> generate(int partition, String key, long counter);
 192         }
 193
 194         void send100Messages(RecordGenerator recordGenerator)
 195         {
 196                 long i = 0;
 197
 198                 for (int partition = 0; partition < 10; partition++)
 199                 {
 200                         for (int key = 0; key < 10; key++)
 201                         {
 202                                 ProducerRecord<String, Bytes> record =
 203                                                 recordGenerator.generate(partition, Integer.toString(partition*10+key%2), ++i);
 204
 205                                 kafkaProducer.send(record, (metadata, e) ->
 206                                 {
 207                                         if (metadata != null)
 208                                         {
 209                                                 log.debug(
 210                                                                 "{}|{} - {}={}",
 211                                                                 metadata.partition(),
 212                                                                 metadata.offset(),
 213                                                                 record.key(),
 214                                                                 record.value());
 215                                         }
 216                                         else
 217                                         {
 218                                                 log.warn(
 219                                                                 "Exception for {}={}: {}",
 220                                                                 record.key(),
 221                                                                 record.value(),
 222                                                                 e.toString());
 223                                         }
 224                                 });
 225                         }
 226                 }
 227         }
 228
 229
 230         @BeforeEach
 231         public void init()
 232         {
 233                 seekToEnd();
 234
 235                 oldOffsets = new HashMap<>();
 236                 newOffsets = new HashMap<>();
 237                 receivedRecords = new HashSet<>();
 238
 239                 doForCurrentOffsets((tp, offset) ->
 240                 {
 241                         oldOffsets.put(tp, offset - 1);
 242                         newOffsets.put(tp, offset - 1);
 243                 });
 244
 245                 TestRecordHandler<String, String> captureOffsetAndExecuteTestHandler =
 246                                 new TestRecordHandler<String, String>(sumRecordHandler) {
 247                                         @Override
 248                                         public void onNewRecord(ConsumerRecord<String, String> record)
 249                                         {
 250                                                 newOffsets.put(
 251                                                                 new TopicPartition(record.topic(), record.partition()),
 252                                                                 record.offset());
 253                                                 receivedRecords.add(record);
 254                                         }
 255                                 };
 256
 257                 endlessConsumer =
 258                                 new EndlessConsumer<>(
 259                                                 executor,
 260                                                 properties.getClientId(),
 261                                                 properties.getTopic(),
 262                                                 kafkaConsumer,
 263                                                 sumRebalanceListener,
 264                                                 captureOffsetAndExecuteTestHandler);
 265
 266                 endlessConsumer.start();
 267         }
 268
 269         @AfterEach
 270         public void deinit()
 271         {
 272                 try
 273                 {
 274                         endlessConsumer.stop();
 275                 }
 276                 catch (Exception e)
 277                 {
 278                         log.info("Exception while stopping the consumer: {}", e.toString());
 279                 }
 280         }
 281
 282
 283         @TestConfiguration
 284         @Import(ApplicationConfiguration.class)
 285         public static class Configuration
 286         {
 287                 @Bean
 288                 Serializer<Long> serializer()
 289                 {
 290                         return new LongSerializer();
 291                 }
 292
 293                 @Bean
 294                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 295                 {
 296                         Properties props = new Properties();
 297                         props.put("bootstrap.servers", properties.getBootstrapServer());
 298                         props.put("linger.ms", 100);
 299                         props.put("key.serializer", StringSerializer.class.getName());
 300                         props.put("value.serializer", BytesSerializer.class.getName());
 301
 302                         return new KafkaProducer<>(props);
 303                 }
 304
 305                 @Bean
 306                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 307                 {
 308                         Properties props = new Properties();
 309                         props.put("bootstrap.servers", properties.getBootstrapServer());
 310                         props.put("client.id", "OFFSET-CONSUMER");
 311                         props.put("enable.auto.commit", false);
 312                         props.put("auto.offset.reset", "latest");
 313                         props.put("key.deserializer", BytesDeserializer.class.getName());
 314                         props.put("value.deserializer", BytesDeserializer.class.getName());
 315
 316                         return new KafkaConsumer<>(props);
 317                 }
 318         }
 319 }