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.test.context.ConfigDataApplicationContextInitializer;
  17 import org.springframework.boot.test.context.TestConfiguration;
  18 import org.springframework.context.annotation.Bean;
  19 import org.springframework.context.annotation.Import;
  20 import org.springframework.kafka.test.context.EmbeddedKafka;
  21 import org.springframework.test.context.TestPropertySource;
  22 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
  23
  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.assertThat;
  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 @EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
  47 @Slf4j
  48 class ApplicationTests
  49 {
  50         public static final String TOPIC = "FOO";
  51         public static final int PARTITIONS = 10;
  52
  53
  54         StringSerializer stringSerializer = new StringSerializer();
  55         LongSerializer longSerializer = new LongSerializer();
  56
  57         @Autowired
  58         KafkaProducer<String, Bytes> kafkaProducer;
  59         @Autowired
  60         KafkaConsumer<String, Long> kafkaConsumer;
  61         @Autowired
  62         KafkaConsumer<Bytes, Bytes> offsetConsumer;
  63         @Autowired
  64         ApplicationProperties properties;
  65         @Autowired
  66         ExecutorService executor;
  67
  68         Consumer<ConsumerRecord<String, Long>> testHandler;
  69         EndlessConsumer<String, Long> endlessConsumer;
  70         Map<TopicPartition, Long> oldOffsets;
  71         Map<TopicPartition, Long> newOffsets;
  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(i ->  new Bytes(longSerializer.serialize(TOPIC, i)));
  81
  82                 Set<ConsumerRecord<String, Long>> received = new HashSet<>();
  83                 testHandler = record -> received.add(record);
  84
  85                 endlessConsumer.start();
  86
  87                 await("100 records received")
  88                                 .atMost(Duration.ofSeconds(30))
  89                                 .until(() -> received.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                 Set<ConsumerRecord<String, Long>> received = new HashSet<>();
 110                 testHandler = record -> received.add(record);
 111
 112                 endlessConsumer.start();
 113
 114                 await("Consumer failed")
 115                                 .atMost(Duration.ofSeconds(30))
 116                                 .until(() -> !endlessConsumer.running());
 117
 118                 checkSeenOffsetsForProgress();
 119                 compareToCommitedOffsets(newOffsets);
 120
 121                 endlessConsumer.start();
 122                 await("Consumer failed")
 123                                 .atMost(Duration.ofSeconds(30))
 124                                 .until(() -> !endlessConsumer.running());
 125
 126                 checkSeenOffsetsForProgress();
 127                 compareToCommitedOffsets(newOffsets);
 128                 assertThat(received.size())
 129                                 .describedAs("Received not all sent events")
 130                                 .isLessThan(100);
 131         }
 132
 133
 134         /** Helper methods for the verification of expectations */
 135
 136         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 137         {
 138                 doForCurrentOffsets((tp, offset) ->
 139                 {
 140                         Long expected = offsetsToCheck.get(tp) + 1;
 141                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 142                         assertThat(offset)
 143                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 144                                         .isEqualTo(expected);
 145                 });
 146         }
 147
 148         void checkSeenOffsetsForProgress()
 149         {
 150                 // Be sure, that some messages were consumed...!
 151                 Set<TopicPartition> withProgress = new HashSet<>();
 152                 partitions().forEach(tp ->
 153                 {
 154                         Long oldOffset = oldOffsets.get(tp);
 155                         Long newOffset = newOffsets.get(tp);
 156                         if (!oldOffset.equals(newOffset))
 157                         {
 158                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 159                                 withProgress.add(tp);
 160                         }
 161                 });
 162                 assertThat(withProgress)
 163                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 164                                 .isNotEmpty();
 165         }
 166
 167
 168         /** Helper methods for setting up and running the tests */
 169
 170         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 171         {
 172                 offsetConsumer.assign(partitions());
 173                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 174                 offsetConsumer.unsubscribe();
 175         }
 176
 177         List<TopicPartition> partitions()
 178         {
 179                 return
 180                                 IntStream
 181                                                 .range(0, PARTITIONS)
 182                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 183                                                 .collect(Collectors.toList());
 184         }
 185
 186
 187         void send100Messages(Function<Long, Bytes> messageGenerator)
 188         {
 189                 long i = 0;
 190
 191                 for (int partition = 0; partition < 10; partition++)
 192                 {
 193                         for (int key = 0; key < 10; key++)
 194                         {
 195                                 Bytes value = messageGenerator.apply(++i);
 196
 197                                 ProducerRecord<String, Bytes> record =
 198                                                 new ProducerRecord<>(
 199                                                                 TOPIC,
 200                                                                 partition,
 201                                                                 Integer.toString(key%2),
 202                                                                 value);
 203
 204                                 kafkaProducer.send(record, (metadata, e) ->
 205                                 {
 206                                         if (metadata != null)
 207                                         {
 208                                                 log.debug(
 209                                                                 "{}|{} - {}={}",
 210                                                                 metadata.partition(),
 211                                                                 metadata.offset(),
 212                                                                 record.key(),
 213                                                                 record.value());
 214                                         }
 215                                         else
 216                                         {
 217                                                 log.warn(
 218                                                                 "Exception for {}={}: {}",
 219                                                                 record.key(),
 220                                                                 record.value(),
 221                                                                 e.toString());
 222                                         }
 223                                 });
 224                         }
 225                 }
 226         }
 227
 228
 229         @BeforeEach
 230         public void init()
 231         {
 232                 testHandler = record -> {} ;
 233
 234                 oldOffsets = new HashMap<>();
 235                 newOffsets = new HashMap<>();
 236
 237                 doForCurrentOffsets((tp, offset) ->
 238                 {
 239                         oldOffsets.put(tp, offset - 1);
 240                         newOffsets.put(tp, offset - 1);
 241                 });
 242
 243                 Consumer<ConsumerRecord<String, Long>> captureOffsetAndExecuteTestHandler =
 244                                 record ->
 245                                 {
 246                                         newOffsets.put(
 247                                                         new TopicPartition(record.topic(), record.partition()),
 248                                                         record.offset());
 249                                         testHandler.accept(record);
 250                                 };
 251
 252                 endlessConsumer =
 253                                 new EndlessConsumer<>(
 254                                                 executor,
 255                                                 properties.getClientId(),
 256                                                 properties.getTopic(),
 257                                                 kafkaConsumer,
 258                                                 captureOffsetAndExecuteTestHandler);
 259         }
 260
 261         @AfterEach
 262         public void deinit()
 263         {
 264                 try
 265                 {
 266                         endlessConsumer.stop();
 267                 }
 268                 catch (Exception e)
 269                 {
 270                         log.info("Exception while stopping the consumer: {}", e.toString());
 271                 }
 272         }
 273
 274
 275         @TestConfiguration
 276         @Import(ApplicationConfiguration.class)
 277         public static class Configuration
 278         {
 279                 @Bean
 280                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 281                 {
 282                         Properties props = new Properties();
 283                         props.put("bootstrap.servers", properties.getBootstrapServer());
 284                         props.put("linger.ms", 100);
 285                         props.put("key.serializer", StringSerializer.class.getName());
 286                         props.put("value.serializer", BytesSerializer.class.getName());
 287
 288                         return new KafkaProducer<>(props);
 289                 }
 290
 291                 @Bean
 292                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 293                 {
 294                         Properties props = new Properties();
 295                         props.put("bootstrap.servers", properties.getBootstrapServer());
 296                         props.put("client.id", "OFFSET-CONSUMER");
 297                         props.put("group.id", properties.getGroupId());
 298                         props.put("key.deserializer", BytesDeserializer.class.getName());
 299                         props.put("value.deserializer", BytesDeserializer.class.getName());
 300
 301                         return new KafkaConsumer<>(props);
 302                 }
 303         }
 304 }