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                 await("100 records received")
  86                                 .atMost(Duration.ofSeconds(30))
  87                                 .until(() -> received.size() >= 100);
  88
  89                 await("Offsets committed")
  90                                 .atMost(Duration.ofSeconds(10))
  91                                 .untilAsserted(() ->
  92                                 {
  93                                         checkSeenOffsetsForProgress();
  94                                         compareToCommitedOffsets(newOffsets);
  95                                 });
  96         }
  97
  98         @Test
  99         @Order(2)
 100         void commitsOffsetOfErrorForReprocessingOnError()
 101         {
 102                 send100Messages(counter ->
 103                                 counter == 77
 104                                                 ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
 105                                                 : new Bytes(longSerializer.serialize(TOPIC, counter)));
 106
 107                 await("Consumer failed")
 108                                 .atMost(Duration.ofSeconds(30))
 109                                 .until(() -> !endlessConsumer.running());
 110
 111                 checkSeenOffsetsForProgress();
 112                 compareToCommitedOffsets(newOffsets);
 113         }
 114
 115
 116         /** Helper methods for the verification of expectations */
 117
 118         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 119         {
 120                 doForCurrentOffsets((tp, offset) ->
 121                 {
 122                         Long expected = offsetsToCheck.get(tp) + 1;
 123                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 124                         assertThat(offset).isEqualTo(expected);
 125                 });
 126         }
 127
 128         void checkSeenOffsetsForProgress()
 129         {
 130                 // Be sure, that some messages were consumed...!
 131                 Set<TopicPartition> withProgress = new HashSet<>();
 132                 partitions().forEach(tp ->
 133                 {
 134                         Long oldOffset = oldOffsets.get(tp);
 135                         Long newOffset = newOffsets.get(tp);
 136                         if (!oldOffset.equals(newOffset))
 137                         {
 138                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 139                                 withProgress.add(tp);
 140                         }
 141                 });
 142                 assertThat(withProgress).isNotEmpty().describedAs("Found no partitions with any offset-progress");
 143         }
 144
 145
 146         /** Helper methods for setting up and running the tests */
 147
 148         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 149         {
 150                 offsetConsumer.assign(partitions());
 151                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 152                 offsetConsumer.unsubscribe();
 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                 testHandler = record -> {} ;
 211
 212                 oldOffsets = new HashMap<>();
 213                 newOffsets = new HashMap<>();
 214
 215                 doForCurrentOffsets((tp, offset) ->
 216                 {
 217                         oldOffsets.put(tp, offset - 1);
 218                         newOffsets.put(tp, offset - 1);
 219                 });
 220
 221                 Consumer<ConsumerRecord<String, Long>> captureOffsetAndExecuteTestHandler =
 222                                 record ->
 223                                 {
 224                                         newOffsets.put(
 225                                                         new TopicPartition(record.topic(), record.partition()),
 226                                                         record.offset());
 227                                         testHandler.accept(record);
 228                                 };
 229
 230                 endlessConsumer =
 231                                 new EndlessConsumer<>(
 232                                                 executor,
 233                                                 properties.getClientId(),
 234                                                 properties.getTopic(),
 235                                                 kafkaConsumer,
 236                                                 captureOffsetAndExecuteTestHandler);
 237
 238                 endlessConsumer.start();
 239         }
 240
 241         @AfterEach
 242         public void deinit()
 243         {
 244                 try
 245                 {
 246                         endlessConsumer.stop();
 247                 }
 248                 catch (Exception e)
 249                 {
 250                         log.info("Exception while stopping the consumer: {}", e.toString());
 251                 }
 252         }
 253
 254
 255         @TestConfiguration
 256         @Import(ApplicationConfiguration.class)
 257         public static class Configuration
 258         {
 259                 @Bean
 260                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 261                 {
 262                         Properties props = new Properties();
 263                         props.put("bootstrap.servers", properties.getBootstrapServer());
 264                         props.put("linger.ms", 100);
 265                         props.put("key.serializer", StringSerializer.class.getName());
 266                         props.put("value.serializer", BytesSerializer.class.getName());
 267
 268                         return new KafkaProducer<>(props);
 269                 }
 270
 271                 @Bean
 272                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 273                 {
 274                         Properties props = new Properties();
 275                         props.put("bootstrap.servers", properties.getBootstrapServer());
 276                         props.put("client.id", "OFFSET-CONSUMER");
 277                         props.put("group.id", properties.getGroupId());
 278                         props.put("key.deserializer", BytesDeserializer.class.getName());
 279                         props.put("value.deserializer", BytesDeserializer.class.getName());
 280
 281                         return new KafkaConsumer<>(props);
 282                 }
 283         }
 284 }