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                 endlessConsumer.start();
 115                 await("Consumer failed")
 116                                 .atMost(Duration.ofSeconds(30))
 117                                 .until(() -> !endlessConsumer.running());
 118
 119                 checkSeenOffsetsForProgress();
 120                 compareToCommitedOffsets(newOffsets);
 121         }
 122
 123
 124         /** Helper methods for the verification of expectations */
 125
 126         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 127         {
 128                 doForCurrentOffsets((tp, offset) ->
 129                 {
 130                         Long expected = offsetsToCheck.get(tp) + 1;
 131                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 132                         assertThat(offset)
 133                                         .describedAs("Committed offset corresponds to the offset of the consumer")
 134                                         .isEqualTo(expected);
 135                 });
 136         }
 137
 138         void checkSeenOffsetsForProgress()
 139         {
 140                 // Be sure, that some messages were consumed...!
 141                 Set<TopicPartition> withProgress = new HashSet<>();
 142                 partitions().forEach(tp ->
 143                 {
 144                         Long oldOffset = oldOffsets.get(tp);
 145                         Long newOffset = newOffsets.get(tp);
 146                         if (!oldOffset.equals(newOffset))
 147                         {
 148                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 149                                 withProgress.add(tp);
 150                         }
 151                 });
 152                 assertThat(withProgress)
 153                                 .describedAs("Some offsets must have changed, compared to the old offset-positions")
 154                                 .isNotEmpty();
 155         }
 156
 157
 158         /** Helper methods for setting up and running the tests */
 159
 160         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 161         {
 162                 offsetConsumer.assign(partitions());
 163                 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
 164                 offsetConsumer.unsubscribe();
 165         }
 166
 167         List<TopicPartition> partitions()
 168         {
 169                 return
 170                                 IntStream
 171                                                 .range(0, PARTITIONS)
 172                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 173                                                 .collect(Collectors.toList());
 174         }
 175
 176
 177         void send100Messages(Function<Long, Bytes> messageGenerator)
 178         {
 179                 long i = 0;
 180
 181                 for (int partition = 0; partition < 10; partition++)
 182                 {
 183                         for (int key = 0; key < 10; key++)
 184                         {
 185                                 Bytes value = messageGenerator.apply(++i);
 186
 187                                 ProducerRecord<String, Bytes> record =
 188                                                 new ProducerRecord<>(
 189                                                                 TOPIC,
 190                                                                 partition,
 191                                                                 Integer.toString(key%2),
 192                                                                 value);
 193
 194                                 kafkaProducer.send(record, (metadata, e) ->
 195                                 {
 196                                         if (metadata != null)
 197                                         {
 198                                                 log.debug(
 199                                                                 "{}|{} - {}={}",
 200                                                                 metadata.partition(),
 201                                                                 metadata.offset(),
 202                                                                 record.key(),
 203                                                                 record.value());
 204                                         }
 205                                         else
 206                                         {
 207                                                 log.warn(
 208                                                                 "Exception for {}={}: {}",
 209                                                                 record.key(),
 210                                                                 record.value(),
 211                                                                 e.toString());
 212                                         }
 213                                 });
 214                         }
 215                 }
 216         }
 217
 218
 219         @BeforeEach
 220         public void init()
 221         {
 222                 testHandler = record -> {} ;
 223
 224                 oldOffsets = new HashMap<>();
 225                 newOffsets = new HashMap<>();
 226
 227                 doForCurrentOffsets((tp, offset) ->
 228                 {
 229                         oldOffsets.put(tp, offset - 1);
 230                         newOffsets.put(tp, offset - 1);
 231                 });
 232
 233                 Consumer<ConsumerRecord<String, Long>> captureOffsetAndExecuteTestHandler =
 234                                 record ->
 235                                 {
 236                                         newOffsets.put(
 237                                                         new TopicPartition(record.topic(), record.partition()),
 238                                                         record.offset());
 239                                         testHandler.accept(record);
 240                                 };
 241
 242                 endlessConsumer =
 243                                 new EndlessConsumer<>(
 244                                                 executor,
 245                                                 properties.getClientId(),
 246                                                 properties.getTopic(),
 247                                                 kafkaConsumer,
 248                                                 captureOffsetAndExecuteTestHandler);
 249
 250                 endlessConsumer.start();
 251         }
 252
 253         @AfterEach
 254         public void deinit()
 255         {
 256                 try
 257                 {
 258                         endlessConsumer.stop();
 259                 }
 260                 catch (Exception e)
 261                 {
 262                         log.info("Exception while stopping the consumer: {}", e.toString());
 263                 }
 264         }
 265
 266
 267         @TestConfiguration
 268         @Import(ApplicationConfiguration.class)
 269         public static class Configuration
 270         {
 271                 @Bean
 272                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 273                 {
 274                         Properties props = new Properties();
 275                         props.put("bootstrap.servers", properties.getBootstrapServer());
 276                         props.put("linger.ms", 100);
 277                         props.put("key.serializer", StringSerializer.class.getName());
 278                         props.put("value.serializer", BytesSerializer.class.getName());
 279
 280                         return new KafkaProducer<>(props);
 281                 }
 282
 283                 @Bean
 284                 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
 285                 {
 286                         Properties props = new Properties();
 287                         props.put("bootstrap.servers", properties.getBootstrapServer());
 288                         props.put("client.id", "OFFSET-CONSUMER");
 289                         props.put("group.id", properties.getGroupId());
 290                         props.put("key.deserializer", BytesDeserializer.class.getName());
 291                         props.put("value.deserializer", BytesDeserializer.class.getName());
 292
 293                         return new KafkaConsumer<>(props);
 294                 }
 295         }
 296 }