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