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.errors.WakeupException;
  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.MethodOrderer;
  15 import org.junit.jupiter.api.Order;
  16 import org.junit.jupiter.api.Test;
  17 import org.junit.jupiter.api.TestMethodOrder;
  18 import org.springframework.beans.factory.annotation.Autowired;
  19 import org.springframework.boot.test.context.ConfigDataApplicationContextInitializer;
  20 import org.springframework.boot.test.context.TestConfiguration;
  21 import org.springframework.context.annotation.Bean;
  22 import org.springframework.context.annotation.Import;
  23 import org.springframework.kafka.test.context.EmbeddedKafka;
  24 import org.springframework.test.context.TestPropertySource;
  25 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
  26
  27 import java.util.*;
  28 import java.util.concurrent.ExecutorService;
  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
  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         ApplicationProperties properties;
  63         @Autowired
  64         ExecutorService executor;
  65
  66         Map<TopicPartition, Long> oldOffsets;
  67         Map<TopicPartition, Long> newOffsets;
  68
  69
  70         @Test
  71         @Order(1) // << The poistion pill is not skipped. Hence, this test must run first
  72         void commitsCurrentOffsetsOnSuccess()
  73         {
  74                 send100Messages(i ->  new Bytes(longSerializer.serialize(TOPIC, i)));
  75
  76                 Set<ConsumerRecord<String, Long>> received = new HashSet<>();
  77                 runEndlessConsumer(record ->
  78                 {
  79                         received.add(record);
  80                         if (received.size() == 100)
  81                                 throw new WakeupException();
  82                 });
  83
  84                 checkSeenOffsetsForProgress();
  85                 compareToCommitedOffsets(newOffsets);
  86         }
  87
  88         @Test
  89         @Order(2)
  90         void commitsOffsetOfErrorForReprocessingOnError()
  91         {
  92                 send100Messages(counter ->
  93                                 counter == 77
  94                                                 ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
  95                                                 : new Bytes(longSerializer.serialize(TOPIC, counter)));
  96
  97                 runEndlessConsumer((record) -> {});
  98
  99                 checkSeenOffsetsForProgress();
 100                 compareToCommitedOffsets(newOffsets);
 101         }
 102
 103
 104         void send100Messages(Function<Long, Bytes> messageGenerator)
 105         {
 106                 long i = 0;
 107
 108                 for (int partition = 0; partition < 10; partition++)
 109                 {
 110                         for (int key = 0; key < 10; key++)
 111                         {
 112                                 Bytes value = messageGenerator.apply(++i);
 113
 114                                 ProducerRecord<String, Bytes> record =
 115                                                 new ProducerRecord<>(
 116                                                                 TOPIC,
 117                                                                 partition,
 118                                                                 Integer.toString(key%2),
 119                                                                 value);
 120
 121                                 kafkaProducer.send(record, (metadata, e) ->
 122                                 {
 123                                         if (metadata != null)
 124                                         {
 125                                                 log.debug(
 126                                                                 "{}|{} - {}={}",
 127                                                                 metadata.partition(),
 128                                                                 metadata.offset(),
 129                                                                 record.key(),
 130                                                                 record.value());
 131                                         }
 132                                         else
 133                                         {
 134                                                 log.warn(
 135                                                                 "Exception for {}={}: {}",
 136                                                                 record.key(),
 137                                                                 record.value(),
 138                                                                 e.toString());
 139                                         }
 140                                 });
 141                         }
 142                 }
 143         }
 144
 145         EndlessConsumer<String, Long> runEndlessConsumer(Consumer<ConsumerRecord<String, Long>> consumer)
 146         {
 147                 oldOffsets = new HashMap<>();
 148                 newOffsets = new HashMap<>();
 149
 150                 doForCurrentOffsets((tp, offset) ->
 151                 {
 152                         oldOffsets.put(tp, offset - 1);
 153                         newOffsets.put(tp, offset - 1);
 154                 });
 155
 156                 Consumer<ConsumerRecord<String, Long>> captureOffset =
 157                                 record ->
 158                                                 newOffsets.put(
 159                                                                 new TopicPartition(record.topic(), record.partition()),
 160                                                                 record.offset());
 161
 162                 EndlessConsumer<String, Long> endlessConsumer =
 163                                 new EndlessConsumer<>(
 164                                                 executor,
 165                                                 properties.getClientId(),
 166                                                 properties.getTopic(),
 167                                                 kafkaConsumer,
 168                                                 captureOffset.andThen(consumer));
 169
 170                 endlessConsumer.run();
 171
 172                 return endlessConsumer;
 173         }
 174
 175         List<TopicPartition> partitions()
 176         {
 177                 return
 178                                 IntStream
 179                                                 .range(0, PARTITIONS)
 180                                                 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
 181                                                 .collect(Collectors.toList());
 182         }
 183
 184         void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
 185         {
 186                 kafkaConsumer.assign(partitions());
 187                 partitions().forEach(tp -> consumer.accept(tp, kafkaConsumer.position(tp)));
 188                 kafkaConsumer.unsubscribe();
 189         }
 190
 191         void checkSeenOffsetsForProgress()
 192         {
 193                 // Be sure, that some messages were consumed...!
 194                 Set<TopicPartition> withProgress = new HashSet<>();
 195                 partitions().forEach(tp ->
 196                 {
 197                         Long oldOffset = oldOffsets.get(tp);
 198                         Long newOffset = newOffsets.get(tp);
 199                         if (!oldOffset.equals(newOffset))
 200                         {
 201                                 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
 202                                 withProgress.add(tp);
 203                         }
 204                 });
 205                 assertThat(withProgress).isNotEmpty().describedAs("Found no partitions with any offset-progress");
 206         }
 207
 208         void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
 209         {
 210                 doForCurrentOffsets((tp, offset) ->
 211                 {
 212                         Long expected = offsetsToCheck.get(tp) + 1;
 213                         log.debug("Checking, if the offset for {} is {}", tp, expected);
 214                         assertThat(offset).isEqualTo(expected);
 215                 });
 216         }
 217
 218
 219         @TestConfiguration
 220         @Import(ApplicationConfiguration.class)
 221         public static class Configuration
 222         {
 223                 @Bean
 224                 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
 225                 {
 226                         Properties props = new Properties();
 227                         props.put("bootstrap.servers", properties.getBootstrapServer());
 228                         props.put("linger.ms", 100);
 229                         props.put("key.serializer", StringSerializer.class.getName());
 230                         props.put("value.serializer", BytesSerializer.class.getName());
 231
 232                         return new KafkaProducer<>(props);
 233                 }
 234         }
 235 }