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.Consumer;
  30 import java.util.function.Function;
  31 import java.util.stream.Collectors;
  32 import java.util.stream.IntStream;
  33
  34 import static de.juplo.kafka.ApplicationTests.PARTITIONS;
  35 import static de.juplo.kafka.ApplicationTests.TOPIC;
  36 import static org.assertj.core.api.Assertions.*;
  37 import static org.awaitility.Awaitility.*;
  38
  39
  40 @SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
  41 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
  42 @TestPropertySource(
  43                 properties = {
  44                                 "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
  45                                 "consumer.topic=" + TOPIC,
  46                                 "consumer.commit-interval=1s",
  47                                 "spring.mongodb.embedded.version=4.4.13" })
  48 @EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
  49 @EnableAutoConfiguration
  50 @AutoConfigureDataMongo
  51 @Slf4j
  52 class ApplicationTests
  53 {
  54         public static final String TOPIC = "FOO";
  55         public static final int PARTITIONS = 10;
  56
  57
  58         StringSerializer stringSerializer = new StringSerializer();
  59
  60         @Autowired
  61         Serializer valueSerializer;
  62         @Autowired
  63         KafkaProducer<String, Bytes> kafkaProducer;
  64         @Autowired
  65         KafkaConsumer<String, String> kafkaConsumer;
  66         @Autowired
  67         PartitionStatisticsRepository partitionStatisticsRepository;
  68         @Autowired
  69         ApplicationProperties properties;
  70         @Autowired
  71         ExecutorService executor;
  72         @Autowired
  73         PartitionStatisticsRepository repository;
  74
  75         Consumer<ConsumerRecord<String, String>> testHandler;
  76         EndlessConsumer endlessConsumer;
  77         Map<TopicPartition, Long> oldOffsets;
  78         Map<TopicPartition, Long> newOffsets;
  79         Set<ConsumerRecord<String, String>> receivedRecords;
  80
  81
  82         /** Tests methods */
  83
  84         @Test
  85         void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
  86         {
  87                 send100Messages(i ->  new Bytes(valueSerializer.serialize(TOPIC, i)));
  88
  89                 await("100 records received")
  90                                 .atMost(Duration.ofSeconds(30))
  91                                 .until(() -> receivedRecords.size() >= 100);
  92
  93                 await("Offsets committed")
  94                                 .atMost(Duration.ofSeconds(10))
  95                                 .untilAsserted(() ->
  96                                 {
  97                                         checkSeenOffsetsForProgress();
  98                                         compareToCommitedOffsets(newOffsets);
  99                                 });
 100
 101                 assertThatExceptionOfType(IllegalStateException.class)
 102                                 .isThrownBy(() -> endlessConsumer.exitStatus())
 103                                 .describedAs("Consumer should still be running");
 104         }
 105
 106
 107         /** Helper methods for the verification of expectations */
 108
 109         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 110         {
 111                 doForCurrentOffsets((tp, offset) ->
 112                 {
 113                         Long expected = offsetsToCheck.get(tp) + 1;
 114                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 115                         assertThat(offset)
 116                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 117                                         .isEqualTo(expected);
 118                 });
 119         }
 120
 121         void checkSeenOffsetsForProgress()
 122         {
 123                 // Be sure, that some messages were consumed...!
 124                 Set<TopicPartition> withProgress = new HashSet<>();
 125                 partitions().forEach(tp ->
 126                 {
 127                         Long oldOffset = oldOffsets.get(tp);
 128                         Long newOffset = newOffsets.get(tp);
 129                         if (!oldOffset.equals(newOffset))
 130                         {
 131                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 132                                 withProgress.add(tp);
 133                         }
 134                 });
 135                 assertThat(withProgress)
 136                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 137                                 .isNotEmpty();
 138         }
 139
 140
 141         /** Helper methods for setting up and running the tests */
 142
 143         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 144         {
 145                 partitions().forEach(tp ->
 146                 {
 147                         String partition = Integer.toString(tp.partition());
 148                         Optional<Long> offset = partitionStatisticsRepository.findById(partition).map(document -> document.offset);
 149                         consumer.accept(tp, offset.orElse(0l));
 150                 });
 151         }
 152
 153         List<TopicPartition> partitions()
 154         {
 155                 return
 156                                 IntStream
 157                                                 .range(0, PARTITIONS)
 158                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 159                                                 .collect(Collectors.toList());
 160         }
 161
 162
 163         void send100Messages(Function<Long, Bytes> messageGenerator)
 164         {
 165                 long i = 0;
 166
 167                 for (int partition = 0; partition < 10; partition++)
 168                 {
 169                         for (int key = 0; key < 10; key++)
 170                         {
 171                                 Bytes value = messageGenerator.apply(++i);
 172
 173                                 ProducerRecord<String, Bytes> record =
 174                                                 new ProducerRecord<>(
 175                                                                 TOPIC,
 176                                                                 partition,
 177                                                                 Integer.toString(key%2),
 178                                                                 value);
 179
 180                                 kafkaProducer.send(record, (metadata, e) ->
 181                                 {
 182                                         if (metadata != null)
 183                                         {
 184                                                 log.debug(
 185                                                                 "{}|{} - {}={}",
 186                                                                 metadata.partition(),
 187                                                                 metadata.offset(),
 188                                                                 record.key(),
 189                                                                 record.value());
 190                                         }
 191                                         else
 192                                         {
 193                                                 log.warn(
 194                                                                 "Exception for {}={}: {}",
 195                                                                 record.key(),
 196                                                                 record.value(),
 197                                                                 e.toString());
 198                                         }
 199                                 });
 200                         }
 201                 }
 202         }
 203
 204
 205         @BeforeEach
 206         public void init()
 207         {
 208                 testHandler = record -> {} ;
 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                 Consumer<ConsumerRecord<String, String>> captureOffsetAndExecuteTestHandler =
 221                                 record ->
 222                                 {
 223                                         newOffsets.put(
 224                                                         new TopicPartition(record.topic(), record.partition()),
 225                                                         record.offset());
 226                                         receivedRecords.add(record);
 227                                         testHandler.accept(record);
 228                                 };
 229
 230                 endlessConsumer =
 231                                 new EndlessConsumer(
 232                                                 executor,
 233                                                 repository,
 234                                                 properties.getClientId(),
 235                                                 properties.getTopic(),
 236                                                 Clock.systemDefaultZone(),
 237                                                 properties.getCommitInterval(),
 238                                                 kafkaConsumer);
 239
 240                 endlessConsumer.start();
 241         }
 242
 243         @AfterEach
 244         public void deinit()
 245         {
 246                 try
 247                 {
 248                         endlessConsumer.stop();
 249                 }
 250                 catch (Exception e)
 251                 {
 252                         log.info("Exception while stopping the consumer: {}", e.toString());
 253                 }
 254         }
 255
 256
 257         @TestConfiguration
 258         @Import(ApplicationConfiguration.class)
 259         public static class Configuration
 260         {
 261                 @Bean
 262                 Serializer<Long> serializer()
 263                 {
 264                         return new LongSerializer();
 265                 }
 266
 267                 @Bean
 268                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 269                 {
 270                         Properties props = new Properties();
 271                         props.put("bootstrap.servers", properties.getBootstrapServer());
 272                         props.put("linger.ms", 100);
 273                         props.put("key.serializer", StringSerializer.class.getName());
 274                         props.put("value.serializer", BytesSerializer.class.getName());
 275
 276                         return new KafkaProducer<>(props);
 277                 }
 278         }
 279 }