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.Clock;
  24 import java.time.Duration;
  25 import java.util.*;
  26 import java.util.concurrent.ExecutionException;
  27 import java.util.concurrent.ExecutorService;
  28 import java.util.function.BiConsumer;
  29 import java.util.function.Function;
  30 import java.util.stream.Collectors;
  31 import java.util.stream.IntStream;
  32
  33 import static de.juplo.kafka.ApplicationTests.PARTITIONS;
  34 import static de.juplo.kafka.ApplicationTests.TOPIC;
  35 import static org.assertj.core.api.Assertions.*;
  36 import static org.awaitility.Awaitility.*;
  37
  38
  39 @SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
  40 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
  41 @TestPropertySource(
  42                 properties = {
  43                                 "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
  44                                 "consumer.topic=" + TOPIC,
  45                                 "consumer.commit-interval=1s",
  46                                 "spring.mongodb.embedded.version=4.4.13" })
  47 @EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
  48 @EnableAutoConfiguration
  49 @AutoConfigureDataMongo
  50 @Slf4j
  51 class ApplicationTests
  52 {
  53         public static final String TOPIC = "FOO";
  54         public static final int PARTITIONS = 10;
  55
  56
  57         StringSerializer stringSerializer = new StringSerializer();
  58
  59         @Autowired
  60         Serializer valueSerializer;
  61         @Autowired
  62         KafkaProducer<String, Bytes> kafkaProducer;
  63         @Autowired
  64         KafkaConsumer<String, String> kafkaConsumer;
  65         @Autowired
  66         PartitionStatisticsRepository partitionStatisticsRepository;
  67         @Autowired
  68         ApplicationProperties properties;
  69         @Autowired
  70         ExecutorService executor;
  71         @Autowired
  72         PartitionStatisticsRepository repository;
  73         @Autowired
  74         WordcountRebalanceListener wordcountRebalanceListener;
  75         @Autowired
  76         WordcountRecordHandler wordcountRecordHandler;
  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(i ->  new Bytes(valueSerializer.serialize(TOPIC, i)));
  90
  91                 await("100 records received")
  92                                 .atMost(Duration.ofSeconds(30))
  93                                 .until(() -> receivedRecords.size() >= 100);
  94
  95                 await("Offsets committed")
  96                                 .atMost(Duration.ofSeconds(10))
  97                                 .untilAsserted(() ->
  98                                 {
  99                                         checkSeenOffsetsForProgress();
 100                                         compareToCommitedOffsets(newOffsets);
 101                                 });
 102
 103                 assertThatExceptionOfType(IllegalStateException.class)
 104                                 .isThrownBy(() -> endlessConsumer.exitStatus())
 105                                 .describedAs("Consumer should still be running");
 106         }
 107
 108
 109         /** Helper methods for the verification of expectations */
 110
 111         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 112         {
 113                 doForCurrentOffsets((tp, offset) ->
 114                 {
 115                         Long expected = offsetsToCheck.get(tp) + 1;
 116                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 117                         assertThat(offset)
 118                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 119                                         .isEqualTo(expected);
 120                 });
 121         }
 122
 123         void checkSeenOffsetsForProgress()
 124         {
 125                 // Be sure, that some messages were consumed...!
 126                 Set<TopicPartition> withProgress = new HashSet<>();
 127                 partitions().forEach(tp ->
 128                 {
 129                         Long oldOffset = oldOffsets.get(tp);
 130                         Long newOffset = newOffsets.get(tp);
 131                         if (!oldOffset.equals(newOffset))
 132                         {
 133                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 134                                 withProgress.add(tp);
 135                         }
 136                 });
 137                 assertThat(withProgress)
 138                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 139                                 .isNotEmpty();
 140         }
 141
 142
 143         /** Helper methods for setting up and running the tests */
 144
 145         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 146         {
 147                 partitions().forEach(tp ->
 148                 {
 149                         String partition = Integer.toString(tp.partition());
 150                         Optional<Long> offset = partitionStatisticsRepository.findById(partition).map(document -> document.offset);
 151                         consumer.accept(tp, offset.orElse(0l));
 152                 });
 153         }
 154
 155         List<TopicPartition> partitions()
 156         {
 157                 return
 158                                 IntStream
 159                                                 .range(0, PARTITIONS)
 160                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 161                                                 .collect(Collectors.toList());
 162         }
 163
 164
 165         void send100Messages(Function<Long, Bytes> messageGenerator)
 166         {
 167                 long i = 0;
 168
 169                 for (int partition = 0; partition < 10; partition++)
 170                 {
 171                         for (int key = 0; key < 10; key++)
 172                         {
 173                                 Bytes value = messageGenerator.apply(++i);
 174
 175                                 ProducerRecord<String, Bytes> record =
 176                                                 new ProducerRecord<>(
 177                                                                 TOPIC,
 178                                                                 partition,
 179                                                                 Integer.toString(key%2),
 180                                                                 value);
 181
 182                                 kafkaProducer.send(record, (metadata, e) ->
 183                                 {
 184                                         if (metadata != null)
 185                                         {
 186                                                 log.debug(
 187                                                                 "{}|{} - {}={}",
 188                                                                 metadata.partition(),
 189                                                                 metadata.offset(),
 190                                                                 record.key(),
 191                                                                 record.value());
 192                                         }
 193                                         else
 194                                         {
 195                                                 log.warn(
 196                                                                 "Exception for {}={}: {}",
 197                                                                 record.key(),
 198                                                                 record.value(),
 199                                                                 e.toString());
 200                                         }
 201                                 });
 202                         }
 203                 }
 204         }
 205
 206
 207         @BeforeEach
 208         public void init()
 209         {
 210                 oldOffsets = new HashMap<>();
 211                 newOffsets = new HashMap<>();
 212                 receivedRecords = new HashSet<>();
 213
 214                 doForCurrentOffsets((tp, offset) ->
 215                 {
 216                         oldOffsets.put(tp, offset - 1);
 217                         newOffsets.put(tp, offset - 1);
 218                 });
 219
 220                 TestRecordHandler<String, String> captureOffsetAndExecuteTestHandler =
 221                                 new TestRecordHandler<String, String>(wordcountRecordHandler) {
 222                                         @Override
 223                                         public void onNewRecord(ConsumerRecord<String, String> record)
 224                                         {
 225                                                 newOffsets.put(
 226                                                                 new TopicPartition(record.topic(), record.partition()),
 227                                                                 record.offset());
 228                                                 receivedRecords.add(record);
 229                                         }
 230                                 };
 231
 232                 endlessConsumer =
 233                                 new EndlessConsumer<>(
 234                                                 executor,
 235                                                 properties.getClientId(),
 236                                                 properties.getTopic(),
 237                                                 kafkaConsumer,
 238                                                 wordcountRebalanceListener,
 239                                                 captureOffsetAndExecuteTestHandler);
 240
 241                 endlessConsumer.start();
 242         }
 243
 244         @AfterEach
 245         public void deinit()
 246         {
 247                 try
 248                 {
 249                         endlessConsumer.stop();
 250                 }
 251                 catch (Exception e)
 252                 {
 253                         log.info("Exception while stopping the consumer: {}", e.toString());
 254                 }
 255         }
 256
 257
 258         @TestConfiguration
 259         @Import(ApplicationConfiguration.class)
 260         public static class Configuration
 261         {
 262                 @Bean
 263                 Serializer<Long> serializer()
 264                 {
 265                         return new LongSerializer();
 266                 }
 267
 268                 @Bean
 269                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 270                 {
 271                         Properties props = new Properties();
 272                         props.put("bootstrap.servers", properties.getBootstrapServer());
 273                         props.put("linger.ms", 100);
 274                         props.put("key.serializer", StringSerializer.class.getName());
 275                         props.put("value.serializer", BytesSerializer.class.getName());
 276
 277                         return new KafkaProducer<>(props);
 278                 }
 279         }
 280 }