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         Set<ConsumerRecord<String, Long>> receivedRecords;
  73
  74
  75         /** Tests methods */
  76
  77         @Test
  78         @Order(1) // << The poistion pill is not skipped. Hence, this test must run first
  79         void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
  80         {
  81                 send100Messages(i ->  new Bytes(longSerializer.serialize(TOPIC, i)));
  82
  83                 await("100 records received")
  84                                 .atMost(Duration.ofSeconds(30))
  85                                 .until(() -> receivedRecords.size() >= 100);
  86
  87                 await("Offsets committed")
  88                                 .atMost(Duration.ofSeconds(10))
  89                                 .untilAsserted(() ->
  90                                 {
  91                                         checkSeenOffsetsForProgress();
  92                                         compareToCommitedOffsets(newOffsets);
  93                                 });
  94         }
  95
  96         @Test
  97         @Order(2)
  98         void commitsOffsetOfErrorForReprocessingOnError()
  99         {
 100                 send100Messages(counter ->
 101                                 counter == 77
 102                                                 ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
 103                                                 : new Bytes(longSerializer.serialize(TOPIC, counter)));
 104
 105                 await("Consumer failed")
 106                                 .atMost(Duration.ofSeconds(30))
 107                                 .until(() -> !endlessConsumer.running());
 108
 109                 checkSeenOffsetsForProgress();
 110                 compareToCommitedOffsets(newOffsets);
 111
 112                 endlessConsumer.start();
 113                 await("Consumer failed")
 114                                 .atMost(Duration.ofSeconds(30))
 115                                 .until(() -> !endlessConsumer.running());
 116
 117                 checkSeenOffsetsForProgress();
 118                 compareToCommitedOffsets(newOffsets);
 119                 assertThat(receivedRecords.size())
 120                                 .describedAs("Received not all sent events")
 121                                 .isLessThan(100);
 122         }
 123
 124
 125         /** Helper methods for the verification of expectations */
 126
 127         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 128         {
 129                 doForCurrentOffsets((tp, offset) ->
 130                 {
 131                         Long expected = offsetsToCheck.get(tp) + 1;
 132                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 133                         assertThat(offset)
 134                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 135                                         .isEqualTo(expected);
 136                 });
 137         }
 138
 139         void checkSeenOffsetsForProgress()
 140         {
 141                 // Be sure, that some messages were consumed...!
 142                 Set<TopicPartition> withProgress = new HashSet<>();
 143                 partitions().forEach(tp ->
 144                 {
 145                         Long oldOffset = oldOffsets.get(tp);
 146                         Long newOffset = newOffsets.get(tp);
 147                         if (!oldOffset.equals(newOffset))
 148                         {
 149                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 150                                 withProgress.add(tp);
 151                         }
 152                 });
 153                 assertThat(withProgress)
 154                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 155                                 .isNotEmpty();
 156         }
 157
 158
 159         /** Helper methods for setting up and running the tests */
 160
 161         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 162         {
 163                 offsetConsumer.assign(partitions());
 164                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 165                 offsetConsumer.unsubscribe();
 166         }
 167
 168         List<TopicPartition> partitions()
 169         {
 170                 return
 171                                 IntStream
 172                                                 .range(0, PARTITIONS)
 173                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 174                                                 .collect(Collectors.toList());
 175         }
 176
 177
 178         void send100Messages(Function<Long, Bytes> messageGenerator)
 179         {
 180                 long i = 0;
 181
 182                 for (int partition = 0; partition < 10; partition++)
 183                 {
 184                         for (int key = 0; key < 10; key++)
 185                         {
 186                                 Bytes value = messageGenerator.apply(++i);
 187
 188                                 ProducerRecord<String, Bytes> record =
 189                                                 new ProducerRecord<>(
 190                                                                 TOPIC,
 191                                                                 partition,
 192                                                                 Integer.toString(key%2),
 193                                                                 value);
 194
 195                                 kafkaProducer.send(record, (metadata, e) ->
 196                                 {
 197                                         if (metadata != null)
 198                                         {
 199                                                 log.debug(
 200                                                                 "{}|{} - {}={}",
 201                                                                 metadata.partition(),
 202                                                                 metadata.offset(),
 203                                                                 record.key(),
 204                                                                 record.value());
 205                                         }
 206                                         else
 207                                         {
 208                                                 log.warn(
 209                                                                 "Exception for {}={}: {}",
 210                                                                 record.key(),
 211                                                                 record.value(),
 212                                                                 e.toString());
 213                                         }
 214                                 });
 215                         }
 216                 }
 217         }
 218
 219
 220         @BeforeEach
 221         public void init()
 222         {
 223                 testHandler = record -> {} ;
 224
 225                 oldOffsets = new HashMap<>();
 226                 newOffsets = new HashMap<>();
 227                 receivedRecords = new HashSet<>();
 228
 229                 doForCurrentOffsets((tp, offset) ->
 230                 {
 231                         oldOffsets.put(tp, offset - 1);
 232                         newOffsets.put(tp, offset - 1);
 233                 });
 234
 235                 Consumer<ConsumerRecord<String, Long>> captureOffsetAndExecuteTestHandler =
 236                                 record ->
 237                                 {
 238                                         newOffsets.put(
 239                                                         new TopicPartition(record.topic(), record.partition()),
 240                                                         record.offset());
 241                                         receivedRecords.add(record);
 242                                         testHandler.accept(record);
 243                                 };
 244
 245                 endlessConsumer =
 246                                 new EndlessConsumer<>(
 247                                                 executor,
 248                                                 properties.getClientId(),
 249                                                 properties.getTopic(),
 250                                                 kafkaConsumer,
 251                                                 captureOffsetAndExecuteTestHandler);
 252
 253                 endlessConsumer.start();
 254         }
 255
 256         @AfterEach
 257         public void deinit()
 258         {
 259                 try
 260                 {
 261                         endlessConsumer.stop();
 262                 }
 263                 catch (Exception e)
 264                 {
 265                         log.info("Exception while stopping the consumer: {}", e.toString());
 266                 }
 267         }
 268
 269
 270         @TestConfiguration
 271         @Import(ApplicationConfiguration.class)
 272         public static class Configuration
 273         {
 274                 @Bean
 275                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 276                 {
 277                         Properties props = new Properties();
 278                         props.put("bootstrap.servers", properties.getBootstrapServer());
 279                         props.put("linger.ms", 100);
 280                         props.put("key.serializer", StringSerializer.class.getName());
 281                         props.put("value.serializer", BytesSerializer.class.getName());
 282
 283                         return new KafkaProducer<>(props);
 284                 }
 285
 286                 @Bean
 287                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 288                 {
 289                         Properties props = new Properties();
 290                         props.put("bootstrap.servers", properties.getBootstrapServer());
 291                         props.put("client.id", "OFFSET-CONSUMER");
 292                         props.put("group.id", properties.getGroupId());
 293                         props.put("key.deserializer", BytesDeserializer.class.getName());
 294                         props.put("value.deserializer", BytesDeserializer.class.getName());
 295
 296                         return new KafkaConsumer<>(props);
 297                 }
 298         }
 299 }