1 package de.juplo.kafka;
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;
24 import java.time.Duration;
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;
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.*;
40 @SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
41 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
44 "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
45 "consumer.topic=" + TOPIC })
46 @EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
48 class ApplicationTests
50 public static final String TOPIC = "FOO";
51 public static final int PARTITIONS = 10;
54 StringSerializer stringSerializer = new StringSerializer();
55 LongSerializer longSerializer = new LongSerializer();
58 KafkaProducer<String, Bytes> kafkaProducer;
60 KafkaConsumer<String, Long> kafkaConsumer;
62 KafkaConsumer<Bytes, Bytes> offsetConsumer;
64 ApplicationProperties properties;
66 ExecutorService executor;
68 Consumer<ConsumerRecord<String, Long>> testHandler;
69 EndlessConsumer<String, Long> endlessConsumer;
70 Map<TopicPartition, Long> oldOffsets;
71 Map<TopicPartition, Long> newOffsets;
75 @Order(1) // << The poistion pill is not skipped. Hence, this test must run first
76 void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
78 send100Messages(i -> new Bytes(longSerializer.serialize(TOPIC, i)));
80 Set<ConsumerRecord<String, Long>> received = new HashSet<>();
81 testHandler = record -> received.add(record);
83 await("100 records received")
84 .atMost(Duration.ofSeconds(30))
85 .until(() -> received.size() >= 100);
87 endlessConsumer.stop();
89 checkSeenOffsetsForProgress();
90 compareToCommitedOffsets(newOffsets);
95 void commitsNoOffsetsOnError()
97 send100Messages(counter ->
99 ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
100 : new Bytes(longSerializer.serialize(TOPIC, counter)));
102 await("Consumer failed")
103 .atMost(Duration.ofSeconds(30))
104 .until(() -> !endlessConsumer.running());
106 checkSeenOffsetsForProgress();
107 compareToCommitedOffsets(oldOffsets);
111 void send100Messages(Function<Long, Bytes> messageGenerator)
115 for (int partition = 0; partition < 10; partition++)
117 for (int key = 0; key < 10; key++)
119 Bytes value = messageGenerator.apply(++i);
121 ProducerRecord<String, Bytes> record =
122 new ProducerRecord<>(
125 Integer.toString(key%2),
128 kafkaProducer.send(record, (metadata, e) ->
130 if (metadata != null)
134 metadata.partition(),
142 "Exception for {}={}: {}",
155 testHandler = record -> {} ;
157 oldOffsets = new HashMap<>();
158 newOffsets = new HashMap<>();
160 doForCurrentOffsets((tp, offset) ->
162 oldOffsets.put(tp, offset - 1);
163 newOffsets.put(tp, offset - 1);
166 Consumer<ConsumerRecord<String, Long>> captureOffsetAndExecuteTestHandler =
170 new TopicPartition(record.topic(), record.partition()),
172 testHandler.accept(record);
176 new EndlessConsumer<>(
178 properties.getClientId(),
179 properties.getTopic(),
181 captureOffsetAndExecuteTestHandler);
183 endlessConsumer.start();
186 List<TopicPartition> partitions()
190 .range(0, PARTITIONS)
191 .mapToObj(partition -> new TopicPartition(TOPIC, partition))
192 .collect(Collectors.toList());
195 void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
197 offsetConsumer.assign(partitions());
198 partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
199 offsetConsumer.unsubscribe();
202 void checkSeenOffsetsForProgress()
204 // Be sure, that some messages were consumed...!
205 Set<TopicPartition> withProgress = new HashSet<>();
206 partitions().forEach(tp ->
208 Long oldOffset = oldOffsets.get(tp);
209 Long newOffset = newOffsets.get(tp);
210 if (!oldOffset.equals(newOffset))
212 log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
213 withProgress.add(tp);
216 assertThat(withProgress).isNotEmpty().describedAs("Found no partitions with any offset-progress");
219 void compareToCommitedOffsets(Map<TopicPartition, Long> offsetsToCheck)
221 doForCurrentOffsets((tp, offset) ->
223 Long expected = offsetsToCheck.get(tp) + 1;
224 log.debug("Checking, if the offset for {} is {}", tp, expected);
225 assertThat(offset).isEqualTo(expected);
235 endlessConsumer.stop();
239 log.info("Exception while stopping the consumer: {}", e.toString());
244 @Import(ApplicationConfiguration.class)
245 public static class Configuration
248 KafkaProducer<String, Bytes> kafkaProducer(ApplicationProperties properties)
250 Properties props = new Properties();
251 props.put("bootstrap.servers", properties.getBootstrapServer());
252 props.put("linger.ms", 100);
253 props.put("key.serializer", StringSerializer.class.getName());
254 props.put("value.serializer", BytesSerializer.class.getName());
256 return new KafkaProducer<>(props);
260 KafkaConsumer<Bytes, Bytes> offsetConsumer(ApplicationProperties properties)
262 Properties props = new Properties();
263 props.put("bootstrap.servers", properties.getBootstrapServer());
264 props.put("client.id", "OFFSET-CONSUMER");
265 props.put("group.id", properties.getGroupId());
266 props.put("key.deserializer", BytesDeserializer.class.getName());
267 props.put("value.deserializer", BytesDeserializer.class.getName());
269 return new KafkaConsumer<>(props);