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.errors.RecordDeserializationException;
  10 import org.apache.kafka.common.serialization.*;
  11 import org.apache.kafka.common.utils.Bytes;
  12 import org.junit.jupiter.api.*;
  13 import org.springframework.beans.factory.annotation.Autowired;
  14 import org.springframework.boot.test.context.ConfigDataApplicationContextInitializer;
  15 import org.springframework.boot.test.context.TestConfiguration;
  16 import org.springframework.context.annotation.Bean;
  17 import org.springframework.context.annotation.Import;
  18 import org.springframework.kafka.test.context.EmbeddedKafka;
  19 import org.springframework.test.context.TestPropertySource;
  20 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
  21
  22 import java.time.Duration;
  23 import java.util.*;
  24 import java.util.concurrent.ExecutionException;
  25 import java.util.concurrent.ExecutorService;
  26 import java.util.function.BiConsumer;
  27 import java.util.function.Consumer;
  28 import java.util.function.Function;
  29 import java.util.stream.Collectors;
  30 import java.util.stream.IntStream;
  31
  32 import static de.juplo.kafka.ApplicationTests.PARTITIONS;
  33 import static de.juplo.kafka.ApplicationTests.TOPIC;
  34 import static org.assertj.core.api.Assertions.*;
  35 import static org.awaitility.Awaitility.*;
  36
  37
  38 @SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
  39 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
  40 @TestPropertySource(
  41                 properties = {
  42                                 "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
  43                                 "consumer.topic=" + TOPIC })
  44 @EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
  45 @Slf4j
  46 class ApplicationTests
  47 {
  48         public static final String TOPIC = "FOO";
  49         public static final int PARTITIONS = 10;
  50
  51
  52         StringSerializer stringSerializer = new StringSerializer();
  53
  54         @Autowired
  55         Serializer valueSerializer;
  56         @Autowired
  57         KafkaProducer<String, Bytes> kafkaProducer;
  58         @Autowired
  59         KafkaConsumer<String, Long> kafkaConsumer;
  60         @Autowired
  61         KafkaConsumer<Bytes, Bytes> offsetConsumer;
  62         @Autowired
  63         ApplicationProperties properties;
  64         @Autowired
  65         ExecutorService executor;
  66
  67         Consumer<ConsumerRecord<String, Long>> testHandler;
  68         EndlessConsumer<String, Long> endlessConsumer;
  69         Map<TopicPartition, Long> oldOffsets;
  70         Map<TopicPartition, Long> newOffsets;
  71         Set<ConsumerRecord<String, Long>> receivedRecords;
  72
  73
  74         /** Tests methods */
  75
  76         @Test
  77         @Order(1) // << The poistion pill is not skipped. Hence, this test must run first
  78         void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
  79         {
  80                 send100Messages((partition, key, counter) ->
  81                 {
  82                         Bytes value = new Bytes(valueSerializer.serialize(TOPIC, counter));
  83                         return new ProducerRecord<>(TOPIC, partition, key, value);
  84                 });
  85
  86                 await("100 records received")
  87                                 .atMost(Duration.ofSeconds(30))
  88                                 .until(() -> receivedRecords.size() >= 100);
  89
  90                 await("Offsets committed")
  91                                 .atMost(Duration.ofSeconds(10))
  92                                 .untilAsserted(() ->
  93                                 {
  94                                         checkSeenOffsetsForProgress();
  95                                         compareToCommitedOffsets(newOffsets);
  96                                 });
  97
  98                 assertThatExceptionOfType(IllegalStateException.class)
  99                                 .isThrownBy(() -> endlessConsumer.exitStatus())
 100                                 .describedAs("Consumer should still be running");
 101         }
 102
 103         @Test
 104         @Order(2)
 105         void commitsOffsetOfErrorForReprocessingOnError()
 106         {
 107                 send100Messages((partition, key, counter) ->
 108                 {
 109                         Bytes value = counter == 77
 110                                         ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
 111                                         : new Bytes(valueSerializer.serialize(TOPIC, counter));
 112                         return new ProducerRecord<>(TOPIC, partition, key, value);
 113                 });
 114
 115                 await("Consumer failed")
 116                                 .atMost(Duration.ofSeconds(30))
 117                                 .until(() -> !endlessConsumer.running());
 118
 119                 checkSeenOffsetsForProgress();
 120                 compareToCommitedOffsets(newOffsets);
 121
 122                 endlessConsumer.start();
 123                 await("Consumer failed")
 124                                 .atMost(Duration.ofSeconds(30))
 125                                 .until(() -> !endlessConsumer.running());
 126
 127                 checkSeenOffsetsForProgress();
 128                 compareToCommitedOffsets(newOffsets);
 129                 assertThat(receivedRecords.size())
 130                                 .describedAs("Received not all sent events")
 131                                 .isLessThan(100);
 132
 133                 assertThatNoException()
 134                                 .describedAs("Consumer should not be running")
 135                                 .isThrownBy(() -> endlessConsumer.exitStatus());
 136                 assertThat(endlessConsumer.exitStatus())
 137                                 .describedAs("Consumer should have exited abnormally")
 138                                 .containsInstanceOf(RecordDeserializationException.class);
 139         }
 140
 141
 142         /** Helper methods for the verification of expectations */
 143
 144         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 145         {
 146                 doForCurrentOffsets((tp, offset) ->
 147                 {
 148                         Long expected = offsetsToCheck.get(tp) + 1;
 149                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 150                         assertThat(offset)
 151                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 152                                         .isEqualTo(expected);
 153                 });
 154         }
 155
 156         void checkSeenOffsetsForProgress()
 157         {
 158                 // Be sure, that some messages were consumed...!
 159                 Set<TopicPartition> withProgress = new HashSet<>();
 160                 partitions().forEach(tp ->
 161                 {
 162                         Long oldOffset = oldOffsets.get(tp);
 163                         Long newOffset = newOffsets.get(tp);
 164                         if (!oldOffset.equals(newOffset))
 165                         {
 166                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 167                                 withProgress.add(tp);
 168                         }
 169                 });
 170                 assertThat(withProgress)
 171                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 172                                 .isNotEmpty();
 173         }
 174
 175
 176         /** Helper methods for setting up and running the tests */
 177
 178         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 179         {
 180                 offsetConsumer.assign(partitions());
 181                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 182                 offsetConsumer.unsubscribe();
 183         }
 184
 185         List<TopicPartition> partitions()
 186         {
 187                 return
 188                                 IntStream
 189                                                 .range(0, PARTITIONS)
 190                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 191                                                 .collect(Collectors.toList());
 192         }
 193
 194
 195         public interface RecordGenerator<K, V>
 196         {
 197                 public ProducerRecord<String, Bytes> generate(int partition, String key, long counter);
 198         }
 199
 200         void send100Messages(RecordGenerator recordGenerator)
 201         {
 202                 long i = 0;
 203
 204                 for (int partition = 0; partition < 10; partition++)
 205                 {
 206                         for (int key = 0; key < 10; key++)
 207                         {
 208                                 ProducerRecord<String, Bytes> record =
 209                                                 recordGenerator.generate(partition, Integer.toString(key%2), ++i);
 210
 211                                 kafkaProducer.send(record, (metadata, e) ->
 212                                 {
 213                                         if (metadata != null)
 214                                         {
 215                                                 log.debug(
 216                                                                 "{}|{} - {}={}",
 217                                                                 metadata.partition(),
 218                                                                 metadata.offset(),
 219                                                                 record.key(),
 220                                                                 record.value());
 221                                         }
 222                                         else
 223                                         {
 224                                                 log.warn(
 225                                                                 "Exception for {}={}: {}",
 226                                                                 record.key(),
 227                                                                 record.value(),
 228                                                                 e.toString());
 229                                         }
 230                                 });
 231                         }
 232                 }
 233         }
 234
 235
 236         @BeforeEach
 237         public void init()
 238         {
 239                 testHandler = record -> {} ;
 240
 241                 oldOffsets = new HashMap<>();
 242                 newOffsets = new HashMap<>();
 243                 receivedRecords = new HashSet<>();
 244
 245                 doForCurrentOffsets((tp, offset) ->
 246                 {
 247                         oldOffsets.put(tp, offset - 1);
 248                         newOffsets.put(tp, offset - 1);
 249                 });
 250
 251                 Consumer<ConsumerRecord<String, Long>> captureOffsetAndExecuteTestHandler =
 252                                 record ->
 253                                 {
 254                                         newOffsets.put(
 255                                                         new TopicPartition(record.topic(), record.partition()),
 256                                                         record.offset());
 257                                         receivedRecords.add(record);
 258                                         testHandler.accept(record);
 259                                 };
 260
 261                 endlessConsumer =
 262                                 new EndlessConsumer<>(
 263                                                 executor,
 264                                                 properties.getClientId(),
 265                                                 properties.getTopic(),
 266                                                 kafkaConsumer,
 267                                                 captureOffsetAndExecuteTestHandler);
 268
 269                 endlessConsumer.start();
 270         }
 271
 272         @AfterEach
 273         public void deinit()
 274         {
 275                 try
 276                 {
 277                         endlessConsumer.stop();
 278                 }
 279                 catch (Exception e)
 280                 {
 281                         log.info("Exception while stopping the consumer: {}", e.toString());
 282                 }
 283         }
 284
 285
 286         @TestConfiguration
 287         @Import(ApplicationConfiguration.class)
 288         public static class Configuration
 289         {
 290                 @Bean
 291                 Serializer<Long> serializer()
 292                 {
 293                         return new LongSerializer();
 294                 }
 295
 296                 @Bean
 297                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 298                 {
 299                         Properties props = new Properties();
 300                         props.put("bootstrap.servers", properties.getBootstrapServer());
 301                         props.put("linger.ms", 100);
 302                         props.put("key.serializer", StringSerializer.class.getName());
 303                         props.put("value.serializer", BytesSerializer.class.getName());
 304
 305                         return new KafkaProducer<>(props);
 306                 }
 307
 308                 @Bean
 309                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 310                 {
 311                         Properties props = new Properties();
 312                         props.put("bootstrap.servers", properties.getBootstrapServer());
 313                         props.put("client.id", "OFFSET-CONSUMER");
 314                         props.put("group.id", properties.getGroupId());
 315                         props.put("key.deserializer", BytesDeserializer.class.getName());
 316                         props.put("value.deserializer", BytesDeserializer.class.getName());
 317
 318                         return new KafkaConsumer<>(props);
 319                 }
 320         }
 321 }