sumup.adder.throttle: 3ms
spring.data.mongodb.uri: mongodb://juplo:training@mongo:27017
spring.data.mongodb.database: juplo
- logging.level.org.apache.kafka.clients.consumer: DEBUG
+ logging.level.org.apache.kafka.clients.consumer: INFO
adder-2:
image: juplo/sumup-adder-springified:1.0-SNAPSHOT
sumup.adder.throttle: 3ms
spring.data.mongodb.uri: mongodb://juplo:training@mongo:27017
spring.data.mongodb.database: juplo
- logging.level.org.apache.kafka.clients.consumer: DEBUG
+ logging.level.org.apache.kafka.clients.consumer: INFO
peter:
image: juplo/toolbox
package de.juplo.kafka;
import lombok.extern.slf4j.Slf4j;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.ApplicationArguments;
-import org.springframework.boot.ApplicationRunner;
+import org.apache.kafka.common.serialization.ByteArraySerializer;
+import org.apache.kafka.common.serialization.StringSerializer;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.kafka.annotation.EnableKafka;
+import org.springframework.kafka.config.KafkaListenerEndpointRegistry;
+import org.springframework.kafka.core.DefaultKafkaProducerFactory;
+import org.springframework.kafka.core.KafkaOperations;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.kafka.core.ProducerFactory;
+import org.springframework.kafka.listener.DeadLetterPublishingRecoverer;
+import org.springframework.kafka.listener.DefaultErrorHandler;
+import org.springframework.kafka.support.serializer.DelegatingByTypeSerializer;
+import org.springframework.kafka.support.serializer.JsonSerializer;
+import org.springframework.util.backoff.FixedBackOff;
-import javax.annotation.PreDestroy;
+import java.util.Map;
+import java.util.Optional;
@SpringBootApplication
@Slf4j
-public class Application implements ApplicationRunner
+@EnableConfigurationProperties({ KafkaProperties.class, ApplicationProperties.class })
+@EnableKafka
+public class Application
{
- @Autowired
- EndlessConsumer endlessConsumer;
+ @Bean
+ public ApplicationRecordHandler applicationRecordHandler(
+ AdderResults adderResults,
+ KafkaProperties kafkaProperties,
+ ApplicationProperties applicationProperties)
+ {
+ return new ApplicationRecordHandler(
+ adderResults,
+ Optional.ofNullable(applicationProperties.getThrottle()),
+ kafkaProperties.getConsumer().getGroupId());
+ }
+
+ @Bean
+ public AdderResults adderResults()
+ {
+ return new AdderResults();
+ }
+
+ @Bean
+ public ApplicationRebalanceListener rebalanceListener(
+ ApplicationRecordHandler recordHandler,
+ AdderResults adderResults,
+ StateRepository stateRepository,
+ KafkaProperties kafkaProperties)
+ {
+ return new ApplicationRebalanceListener(
+ recordHandler,
+ adderResults,
+ stateRepository,
+ kafkaProperties.getConsumer().getGroupId());
+ }
+ @Bean
+ ApplicationHealthIndicator applicationHealthIndicator(
+ KafkaListenerEndpointRegistry registry,
+ KafkaProperties properties)
+ {
+ return new ApplicationHealthIndicator(
+ properties.getConsumer().getGroupId(),
+ registry);
+ }
+
+ @Bean
+ public ProducerFactory<String, Object> producerFactory(
+ KafkaProperties properties)
+ {
+ return new DefaultKafkaProducerFactory<>(
+ properties.getProducer().buildProperties(),
+ new StringSerializer(),
+ new DelegatingByTypeSerializer(
+ Map.of(
+ byte[].class, new ByteArraySerializer(),
+ MessageAddNumber.class, new JsonSerializer<>(),
+ MessageCalculateSum.class, new JsonSerializer<>())));
+ }
+
+ @Bean
+ public KafkaTemplate<String, Object> kafkaTemplate(
+ ProducerFactory<String, Object> producerFactory)
+ {
+ return new KafkaTemplate<>(producerFactory);
+ }
- @Override
- public void run(ApplicationArguments args) throws Exception
+ @Bean
+ public DeadLetterPublishingRecoverer deadLetterPublishingRecoverer(
+ KafkaOperations<?, ?> kafkaTemplate)
{
- log.info("Starting EndlessConsumer");
- endlessConsumer.start();
+ return new DeadLetterPublishingRecoverer(kafkaTemplate);
}
- @PreDestroy
- public void shutdown()
+ @Bean
+ public DefaultErrorHandler errorHandler(
+ DeadLetterPublishingRecoverer recoverer)
{
- try
- {
- log.info("Stopping EndlessConsumer");
- endlessConsumer.stop();
- }
- catch (IllegalStateException e)
- {
- log.info("Was already stopped: {}", e.toString());
- }
- catch (Exception e)
- {
- log.error("Unexpected exception while stopping EndlessConsumer: {}", e);
- }
+ return new DefaultErrorHandler(
+ recoverer,
+ new FixedBackOff(0l, 0l));
}
+++ /dev/null
-package de.juplo.kafka;
-
-import org.apache.kafka.common.serialization.ByteArraySerializer;
-import org.apache.kafka.common.serialization.StringSerializer;
-import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
-import org.springframework.boot.context.properties.EnableConfigurationProperties;
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Configuration;
-
-import java.util.Map;
-import java.util.Optional;
-
-import org.springframework.kafka.config.KafkaListenerEndpointRegistry;
-import org.springframework.kafka.core.DefaultKafkaProducerFactory;
-import org.springframework.kafka.core.KafkaOperations;
-import org.springframework.kafka.core.KafkaTemplate;
-import org.springframework.kafka.core.ProducerFactory;
-import org.springframework.kafka.listener.DeadLetterPublishingRecoverer;
-import org.springframework.kafka.listener.DefaultErrorHandler;
-import org.springframework.kafka.support.serializer.DelegatingByTypeSerializer;
-import org.springframework.kafka.support.serializer.JsonSerializer;
-import org.springframework.util.backoff.FixedBackOff;
-
-
-@Configuration
-@EnableConfigurationProperties({ KafkaProperties.class, ApplicationProperties.class })
-public class ApplicationConfiguration
-{
- @Bean
- public ApplicationRecordHandler applicationRecordHandler(
- AdderResults adderResults,
- KafkaProperties kafkaProperties,
- ApplicationProperties applicationProperties)
- {
- return new ApplicationRecordHandler(
- adderResults,
- Optional.ofNullable(applicationProperties.getThrottle()),
- kafkaProperties.getClientId());
- }
-
- @Bean
- public AdderResults adderResults()
- {
- return new AdderResults();
- }
-
- @Bean
- public ApplicationRebalanceListener rebalanceListener(
- ApplicationRecordHandler recordHandler,
- AdderResults adderResults,
- StateRepository stateRepository,
- KafkaProperties kafkaProperties)
- {
- return new ApplicationRebalanceListener(
- recordHandler,
- adderResults,
- stateRepository,
- kafkaProperties.getClientId());
- }
-
- @Bean
- public EndlessConsumer endlessConsumer(
- RecordHandler recordHandler,
- KafkaProperties kafkaProperties,
- KafkaListenerEndpointRegistry endpointRegistry)
- {
- return
- new EndlessConsumer(
- kafkaProperties.getClientId(),
- endpointRegistry,
- recordHandler);
- }
-
- @Bean
- public ProducerFactory<String, Object> producerFactory(
- KafkaProperties properties)
- {
- return new DefaultKafkaProducerFactory<>(
- properties.getProducer().buildProperties(),
- new StringSerializer(),
- new DelegatingByTypeSerializer(
- Map.of(
- byte[].class, new ByteArraySerializer(),
- MessageAddNumber.class, new JsonSerializer<>(),
- MessageCalculateSum.class, new JsonSerializer<>())));
- }
-
- @Bean
- public KafkaTemplate<String, Object> kafkaTemplate(
- ProducerFactory<String, Object> producerFactory)
- {
- return new KafkaTemplate<>(producerFactory);
- }
-
- @Bean
- public DeadLetterPublishingRecoverer deadLetterPublishingRecoverer(
- KafkaOperations<?, ?> kafkaTemplate)
- {
- return new DeadLetterPublishingRecoverer(kafkaTemplate);
- }
-
- @Bean
- public DefaultErrorHandler errorHandler(
- DeadLetterPublishingRecoverer recoverer)
- {
- return new DefaultErrorHandler(
- recoverer,
- new FixedBackOff(0l, 0l));
- }
-}
--- /dev/null
+package de.juplo.kafka;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.mongodb.core.aggregation.ArithmeticOperators;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+
+@RestController
+@RequiredArgsConstructor
+public class ApplicationController
+{
+ private final AdderResults results;
+
+
+ @GetMapping("results")
+ public Map<Integer, Map<String, List<AdderResult>>> results()
+ {
+ return results.getState();
+ }
+
+ @GetMapping("results/{user}")
+ public ResponseEntity<List<AdderResult>> results(@PathVariable String user)
+ {
+ for (Map<String, List<AdderResult>> resultsByUser : this.results.getState().values())
+ {
+ List<AdderResult> results = resultsByUser.get(user);
+ if (results != null)
+ return ResponseEntity.ok(results);
+ }
+
+ return ResponseEntity.notFound().build();
+ }
+}
import lombok.RequiredArgsConstructor;
import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.actuate.health.HealthIndicator;
-import org.springframework.stereotype.Component;
+import org.springframework.kafka.config.KafkaListenerEndpointRegistry;
-@Component
@RequiredArgsConstructor
public class ApplicationHealthIndicator implements HealthIndicator
{
- private final EndlessConsumer consumer;
+ private final String id;
+ private final KafkaListenerEndpointRegistry registry;
@Override
public Health health()
{
- return consumer.running()
+ return registry.getListenerContainer(id).isRunning()
? Health.up().build()
: Health.down().build();
}
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
+import org.springframework.kafka.annotation.KafkaHandler;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.kafka.support.KafkaHeaders;
+import org.springframework.messaging.handler.annotation.Header;
+import org.springframework.messaging.handler.annotation.Payload;
import java.time.Duration;
import java.util.HashMap;
@RequiredArgsConstructor
@Slf4j
-public class ApplicationRecordHandler implements RecordHandler
+@KafkaListener(
+ id = "${spring.kafka.consumer.group-id}",
+ topics = "${sumup.adder.topic}")
+public class ApplicationRecordHandler
{
private final AdderResults results;
private final Optional<Duration> throttle;
private final Map<Integer, AdderBusinessLogic> state = new HashMap<>();
- @Override
+ @KafkaHandler
public void addNumber(
- String topic,
+ @Header(KafkaHeaders.RECEIVED_PARTITION_ID)
Integer partition,
- Long offset,
+ @Header(KafkaHeaders.RECEIVED_MESSAGE_KEY)
String user,
+ @Payload
MessageAddNumber message)
{
+ log.debug("{} - Received {} for {} on {}", id, message, user, partition);
state.get(partition).addToSum(user, message.getNext());
throttle();
}
- @Override
+ @KafkaHandler
public void calculateSum(
- String topic,
+ @Header(KafkaHeaders.RECEIVED_PARTITION_ID)
Integer partition,
- Long offset,
+ @Header(KafkaHeaders.RECEIVED_MESSAGE_KEY)
String user,
+ @Payload
MessageCalculateSum message)
{
AdderResult result = state.get(partition).calculate(user);
{
return this.state.remove(partition).getState();
}
-
-
- public Map<Integer, AdderBusinessLogic> getState()
- {
- return state;
- }
-
- public AdderBusinessLogic getState(Integer partition)
- {
- return state.get(partition);
- }
}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.RequiredArgsConstructor;
-import org.springframework.http.HttpStatus;
-import org.springframework.http.ResponseEntity;
-import org.springframework.web.bind.annotation.*;
-
-import java.util.List;
-import java.util.Map;
-import java.util.Optional;
-import java.util.concurrent.ExecutionException;
-import java.util.stream.Collectors;
-
-
-@RestController
-@RequiredArgsConstructor
-public class DriverController
-{
- private final EndlessConsumer consumer;
- private final ApplicationRecordHandler recordHandler;
- private final AdderResults results;
-
-
- @PostMapping("start")
- public void start()
- {
- consumer.start();
- }
-
- @PostMapping("stop")
- public void stop() throws ExecutionException, InterruptedException
- {
- consumer.stop();
- }
-
-
- @GetMapping("state")
- public Map<Integer, Map<String, AdderResult>> state()
- {
- return
- recordHandler
- .getState()
- .entrySet()
- .stream()
- .collect(Collectors.toMap(
- entry -> entry.getKey(),
- entry -> entry.getValue().getState()));
- }
-
- @GetMapping("state/{user}")
- public ResponseEntity<Long> state(@PathVariable String user)
- {
- for (AdderBusinessLogic adder : recordHandler.getState().values())
- {
- Optional<Long> sum = adder.getSum(user);
- if (sum.isPresent())
- return ResponseEntity.ok(sum.get());
- }
-
- return ResponseEntity.notFound().build();
- }
-
- @GetMapping("results")
- public Map<Integer, Map<String, List<AdderResult>>> results()
- {
- return results.getState();
- }
-
- @GetMapping("results/{user}")
- public ResponseEntity<List<AdderResult>> results(@PathVariable String user)
- {
- for (Map<String, List<AdderResult>> resultsByUser : this.results.getState().values())
- {
- List<AdderResult> results = resultsByUser.get(user);
- if (results != null)
- return ResponseEntity.ok(results);
- }
-
- return ResponseEntity.notFound().build();
- }
-
-
- @ExceptionHandler
- @ResponseStatus(HttpStatus.BAD_REQUEST)
- public ErrorResponse illegalStateException(IllegalStateException e)
- {
- return new ErrorResponse(e.getMessage(), HttpStatus.BAD_REQUEST.value());
- }
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.RequiredArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.ConsumerRecord;
-import org.springframework.kafka.annotation.KafkaHandler;
-import org.springframework.kafka.annotation.KafkaListener;
-import org.springframework.kafka.config.KafkaListenerEndpointRegistry;
-import org.springframework.kafka.support.KafkaHeaders;
-import org.springframework.messaging.handler.annotation.Header;
-import org.springframework.messaging.handler.annotation.Payload;
-
-import java.util.List;
-import java.util.Optional;
-
-
-@RequiredArgsConstructor
-@Slf4j
-@KafkaListener(
- id = "${spring.kafka.client-id}",
- idIsGroup = false,
- topics = "${sumup.adder.topic}",
- autoStartup = "false")
-public class EndlessConsumer
-{
- private final String id;
- private final KafkaListenerEndpointRegistry registry;
- private final RecordHandler recordHandler;
-
- private long consumed = 0;
-
-
- @KafkaHandler
- public void addNumber(
- @Header(KafkaHeaders.RECEIVED_MESSAGE_KEY) String key,
- @Header(KafkaHeaders.RECEIVED_TOPIC) String topic,
- @Header(KafkaHeaders.RECEIVED_PARTITION_ID) Integer partition,
- @Header(KafkaHeaders.OFFSET) Long offset,
- @Payload MessageAddNumber message)
- {
- log.info(
- "{} - {}: {}/{} - {}={}",
- id,
- offset,
- topic,
- partition,
- key,
- message
- );
-
- recordHandler.addNumber(topic, partition, offset, key, message);
-
- consumed++;
- }
-
- @KafkaHandler
- public void calculateSum(
- @Header(KafkaHeaders.RECEIVED_MESSAGE_KEY) String key,
- @Header(KafkaHeaders.RECEIVED_TOPIC) String topic,
- @Header(KafkaHeaders.RECEIVED_PARTITION_ID) Integer partition,
- @Header(KafkaHeaders.OFFSET) Long offset,
- @Payload MessageCalculateSum message)
- {
- log.info(
- "{} - {}: {}/{} - {}={}",
- id,
- offset,
- topic,
- partition,
- key,
- message
- );
-
- recordHandler.calculateSum(topic, partition, offset, key, message);
-
- consumed++;
- }
-
- public void start()
- {
- if (running())
- throw new IllegalStateException("Consumer instance " + id + " is already running!");
-
- log.info("{} - Starting - consumed {} messages before", id, consumed);
- registry.getListenerContainer(id).start();
- }
-
- public void stop()
- {
- if (!running())
- throw new IllegalStateException("Consumer instance " + id + " is not running!");
-
- log.info("{} - Stopping", id);
- registry.getListenerContainer(id).stop();
- log.info("{} - Stopped - consumed {} messages so far", id, consumed);
- }
-
- public boolean running()
- {
- return registry.getListenerContainer(id).isRunning();
- }
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.Value;
-
-
-@Value
-public class ErrorResponse
-{
- private final String error;
- private final Integer status;
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import org.apache.kafka.clients.consumer.ConsumerRecord;
-
-import java.util.function.Consumer;
-
-
-public interface RecordHandler
-{
- void addNumber(
- String topic,
- Integer partition,
- Long offset,
- String user,
- MessageAddNumber message);
- void calculateSum(
- String topic,
- Integer partition,
- Long offset,
- String user,
- MessageCalculateSum message);
-}
enabled: true
java:
enabled: true
-info:
- kafka:
- bootstrap-server: ${spring.kafka.consumer.bootstrap-servers}
- client-id: ${spring.kafka.consumer.client-id}
- group-id: ${spring.kafka.consumer.group-id}
- topic: ${consumer.topic}
- auto-offset-reset: ${spring.kafka.consumer.auto-offset-reset}
spring:
data:
mongodb:
database: juplo
kafka:
bootstrap-servers: :9092
- client-id: DEV
consumer:
group-id: my-group
- auto-offset-reset: earliest
- auto-commit-interval: 5s
key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
value-deserializer: org.springframework.kafka.support.serializer.ErrorHandlingDeserializer
properties:
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.producer.ProducerRecord;
-import org.apache.kafka.common.serialization.StringSerializer;
-import org.apache.kafka.common.utils.Bytes;
-import org.springframework.beans.factory.annotation.Autowired;
-
-import java.util.*;
-import java.util.function.Consumer;
-import java.util.stream.Collectors;
-import java.util.stream.IntStream;
-
-import static org.assertj.core.api.Assertions.assertThat;
-
-
-@Slf4j
-public class ApplicationTests extends GenericApplicationTests<String, Message>
-{
- @Autowired
- StateRepository stateRepository;
-
-
- public ApplicationTests()
- {
- super(new ApplicationTestRecrodGenerator());
- ((ApplicationTestRecrodGenerator)recordGenerator).tests = this;
- }
-
-
- static class ApplicationTestRecrodGenerator implements RecordGenerator
- {
- ApplicationTests tests;
-
- final int[] numbers = {1, 77, 33, 2, 66, 666, 11};
- final String[] dieWilden13 =
- IntStream
- .range(1, 14)
- .mapToObj(i -> "seeräuber-" + i)
- .toArray(i -> new String[i]);
- final StringSerializer stringSerializer = new StringSerializer();
- final Bytes calculateMessage = new Bytes(stringSerializer.serialize(TOPIC, "{}"));
-
- int counterMessages;
- int counterPoisonPills;
- int counterLogicErrors;
-
- Map<String, List<AdderResult>> state;
-
- @Override
- public void generate(
- boolean poisonPills,
- boolean logicErrors,
- Consumer<ProducerRecord<Bytes, Bytes>> messageSender)
- {
- counterMessages = 0;
- counterPoisonPills = 0;
- counterLogicErrors = 0;
-
- state =
- Arrays
- .stream(dieWilden13)
- .collect(Collectors.toMap(
- seeräuber -> seeräuber,
- seeräuber -> new LinkedList()));
-
- int number[] = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 };
- int message[] = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 };
- int next = 0;
-
- for (int pass = 0; pass < 333; pass++)
- {
- for (int i = 0; i<13; i++)
- {
- String seeräuber = dieWilden13[i];
- Bytes key = new Bytes(stringSerializer.serialize(TOPIC, seeräuber));
-
- if (message[i] > number[i])
- {
- send(
- key,
- calculateMessage,
- Message.Type.CALC,
- poisonPill(poisonPills, pass, counterMessages),
- logicError(logicErrors, pass, counterMessages),
- messageSender);
- state.get(seeräuber).add(new AdderResult(number[i], (number[i] + 1) * number[i] / 2));
- // Pick next number to calculate
- number[i] = numbers[next++%numbers.length];
- message[i] = 1;
- log.debug("Seeräuber {} will die Summe für {} berechnen", seeräuber, number[i]);
- }
-
- send(
- key,
- new Bytes(stringSerializer.serialize(TOPIC, "{\"next\":" + message[i]++ + "}")),
- Message.Type.ADD,
- poisonPill(poisonPills, pass, counterMessages),
- logicError(logicErrors, pass, counterMessages),
- messageSender);
- }
- }
- }
-
- @Override
- public int getNumberOfMessages()
- {
- return counterMessages;
- }
-
- @Override
- public int getNumberOfPoisonPills()
- {
- return counterPoisonPills;
- }
-
- @Override
- public int getNumberOfLogicErrors()
- {
- return counterLogicErrors;
- }
-
- boolean poisonPill (boolean poisonPills, int pass, int counter)
- {
- return poisonPills && pass > 300 && counter%99 == 0;
- }
-
- boolean logicError(boolean logicErrors, int pass, int counter)
- {
- return logicErrors && pass > 300 && counter%77 == 0;
- }
-
- void send(
- Bytes key,
- Bytes value,
- Message.Type type,
- boolean poisonPill,
- boolean logicError,
- Consumer<ProducerRecord<Bytes, Bytes>> messageSender)
- {
- counterMessages++;
-
- if (logicError)
- {
- value = new Bytes(stringSerializer.serialize(TOPIC, "{\"next\":-1}"));
- counterLogicErrors++;
- }
- if (poisonPill)
- {
- value = new Bytes("BOOM!".getBytes());
- counterPoisonPills++;
- }
-
- ProducerRecord<Bytes, Bytes> record = new ProducerRecord<>(TOPIC, key, value);
- record.headers().add("__TypeId__", type.toString().getBytes());
- messageSender.accept(record);
- }
-
- @Override
- public void assertBusinessLogic()
- {
- for (int i=0; i<PARTITIONS; i++)
- {
- StateDocument stateDocument =
- tests.stateRepository.findById(Integer.toString(i)).get();
-
- stateDocument
- .results
- .entrySet()
- .stream()
- .forEach(entry ->
- {
- String user = entry.getKey();
- List<AdderResult> resultsForUser = entry.getValue();
-
- for (int j=0; j < resultsForUser.size(); j++)
- {
- if (!(j < state.get(user).size()))
- {
- break;
- }
-
- assertThat(resultsForUser.get(j))
- .as("Unexpected results calculation %d of user %s", j, user)
- .isEqualTo(state.get(user).get(j));
- }
-
- assertThat(state.get(user))
- .as("More results calculated for user %s as expected", user)
- .containsAll(resultsForUser);
- });
- }
- }
- }
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.extern.slf4j.Slf4j;
-import org.springframework.kafka.annotation.KafkaListener;
-import org.springframework.kafka.support.KafkaHeaders;
-import org.springframework.messaging.Message;
-
-import java.nio.ByteBuffer;
-import java.util.LinkedList;
-import java.util.List;
-
-
-@Slf4j
-public class DeadLetterTopicConsumer
-{
- List<Message<?>> messages = new LinkedList<>();
-
-
- @KafkaListener(
- id = "DLT",
- topics = "${sumup.adder.topic}.DLT",
- containerFactory = "dltContainerFactory")
- public void receive(Message<?> message)
- {
- log.info(
- "Received dead letter on {}-{}|{},{} for {}-{}|{},{}: {}, exception={}",
- message.getHeaders().get(KafkaHeaders.RECEIVED_TOPIC),
- message.getHeaders().get(KafkaHeaders.RECEIVED_PARTITION_ID),
- message.getHeaders().get(KafkaHeaders.OFFSET),
- message.getHeaders().get(KafkaHeaders.RECEIVED_MESSAGE_KEY),
- new String(message.getHeaders().get(KafkaHeaders.DLT_ORIGINAL_TOPIC, byte[].class)),
- ByteBuffer.wrap(message.getHeaders().get(KafkaHeaders.DLT_ORIGINAL_PARTITION, byte[].class)).getInt(),
- ByteBuffer.wrap(message.getHeaders().get(KafkaHeaders.DLT_ORIGINAL_OFFSET, byte[].class)).getLong(),
- message.getHeaders().get(KafkaHeaders.MESSAGE_KEY),
- message.getPayload(),
- new String(message.getHeaders().get(KafkaHeaders.DLT_EXCEPTION_MESSAGE, byte[].class)));
-
- messages.add(message);
- }
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import org.junit.jupiter.api.extension.ConditionEvaluationResult;
-import org.junit.jupiter.api.extension.ExecutionCondition;
-import org.junit.jupiter.api.extension.ExtensionContext;
-import org.junit.platform.commons.util.AnnotationUtils;
-
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Optional;
-import java.util.stream.Collectors;
-
-
-public class ErrorCannotBeGeneratedCondition implements ExecutionCondition
-{
- @Override
- public ConditionEvaluationResult evaluateExecutionCondition(ExtensionContext context)
- {
- final Optional<SkipWhenErrorCannotBeGenerated> optional =
- AnnotationUtils.findAnnotation(
- context.getElement(),
- SkipWhenErrorCannotBeGenerated.class);
-
- if (context.getTestInstance().isEmpty())
- return ConditionEvaluationResult.enabled("Test-instance ist not available");
-
- if (optional.isPresent())
- {
- SkipWhenErrorCannotBeGenerated skipWhenErrorCannotBeGenerated = optional.get();
- GenericApplicationTests instance = (GenericApplicationTests)context.getTestInstance().get();
- List<String> missingRequiredErrors = new LinkedList<>();
-
- if (skipWhenErrorCannotBeGenerated.poisonPill() && !instance.recordGenerator.canGeneratePoisonPill())
- missingRequiredErrors.add("Poison-Pill");
-
- if (skipWhenErrorCannotBeGenerated.logicError() && !instance.recordGenerator.canGenerateLogicError())
- missingRequiredErrors.add("Logic-Error");
-
- StringBuilder builder = new StringBuilder();
- builder.append(context.getTestClass().get().getSimpleName());
-
- if (missingRequiredErrors.isEmpty())
- {
- builder.append(" can generate all required types of errors");
- return ConditionEvaluationResult.enabled(builder.toString());
- }
-
- builder.append(" cannot generate the required error(s): ");
- builder.append(
- missingRequiredErrors
- .stream()
- .collect(Collectors.joining(", ")));
-
- return ConditionEvaluationResult.disabled(builder.toString());
- }
-
- return ConditionEvaluationResult.enabled(
- "Not annotated with " + SkipWhenErrorCannotBeGenerated.class.getSimpleName());
- }
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import com.mongodb.client.MongoClient;
-import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.ConsumerConfig;
-import org.apache.kafka.clients.consumer.KafkaConsumer;
-import org.apache.kafka.clients.producer.KafkaProducer;
-import org.apache.kafka.clients.producer.ProducerRecord;
-import org.apache.kafka.common.TopicPartition;
-import org.apache.kafka.common.serialization.*;
-import org.apache.kafka.common.utils.Bytes;
-import org.junit.jupiter.api.*;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
-import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
-import org.springframework.boot.autoconfigure.mongo.MongoProperties;
-import org.springframework.boot.test.autoconfigure.data.mongo.AutoConfigureDataMongo;
-import org.springframework.boot.test.context.ConfigDataApplicationContextInitializer;
-import org.springframework.boot.test.context.TestConfiguration;
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Import;
-import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
-import org.springframework.kafka.config.KafkaListenerEndpointRegistry;
-import org.springframework.kafka.core.ConsumerFactory;
-import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
-import org.springframework.kafka.test.context.EmbeddedKafka;
-import org.springframework.test.context.TestPropertySource;
-import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
-
-import java.time.Duration;
-import java.util.*;
-import java.util.function.BiConsumer;
-import java.util.function.Consumer;
-import java.util.stream.Collectors;
-import java.util.stream.IntStream;
-
-import static de.juplo.kafka.GenericApplicationTests.PARTITIONS;
-import static de.juplo.kafka.GenericApplicationTests.TOPIC;
-import static org.assertj.core.api.Assertions.*;
-import static org.awaitility.Awaitility.*;
-
-
-@SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class)
-@TestPropertySource(
- properties = {
- "spring.kafka.bootstrap-servers=${spring.embedded.kafka.brokers}",
- "spring.kafka.producer.bootstrap-servers=${spring.embedded.kafka.brokers}",
- "sumup.adder.topic=" + TOPIC,
- "spring.kafka.consumer.auto-commit-interval=500ms",
- "spring.mongodb.embedded.version=4.4.13" })
-@EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
-@EnableAutoConfiguration
-@AutoConfigureDataMongo
-@Slf4j
-abstract class GenericApplicationTests<K, V>
-{
- public static final String TOPIC = "FOO";
- public static final int PARTITIONS = 10;
-
-
- @Autowired
- org.apache.kafka.clients.consumer.Consumer<K, V> kafkaConsumer;
- @Autowired
- KafkaProperties kafkaProperties;
- @Autowired
- ApplicationProperties applicationProperties;
- @Autowired
- MongoClient mongoClient;
- @Autowired
- MongoProperties mongoProperties;
- @Autowired
- KafkaListenerEndpointRegistry kafkaListenerEndpointRegistry;
- @Autowired
- TestRecordHandler recordHandler;
- @Autowired
- DeadLetterTopicConsumer deadLetterTopicConsumer;
- @Autowired
- EndlessConsumer endlessConsumer;
-
- KafkaProducer<Bytes, Bytes> testRecordProducer;
- KafkaConsumer<Bytes, Bytes> offsetConsumer;
- Map<TopicPartition, Long> oldOffsets;
-
-
- final RecordGenerator recordGenerator;
- final Consumer<ProducerRecord<Bytes, Bytes>> messageSender;
-
- public GenericApplicationTests(RecordGenerator recordGenerator)
- {
- this.recordGenerator = recordGenerator;
- this.messageSender = (record) -> sendMessage(record);
- }
-
-
- /** Tests methods */
-
- @Test
- void commitsCurrentOffsetsOnSuccess() throws Exception
- {
- recordGenerator.generate(false, false, messageSender);
-
- int numberOfGeneratedMessages = recordGenerator.getNumberOfMessages();
-
- await(numberOfGeneratedMessages + " records received")
- .atMost(Duration.ofSeconds(30))
- .pollInterval(Duration.ofSeconds(1))
- .until(() -> recordHandler.receivedMessages >= numberOfGeneratedMessages);
-
- await("Offsets committed")
- .atMost(Duration.ofSeconds(10))
- .pollInterval(Duration.ofSeconds(1))
- .untilAsserted(() ->
- {
- checkSeenOffsetsForProgress();
- assertSeenOffsetsEqualCommittedOffsets(recordHandler.seenOffsets);
- });
-
- assertThat(endlessConsumer.running())
- .describedAs("Consumer should still be running")
- .isTrue();
-
- endlessConsumer.stop();
- recordGenerator.assertBusinessLogic();
- }
-
- @Test
- @SkipWhenErrorCannotBeGenerated(poisonPill = true)
- void commitsOffsetOfErrorForReprocessingOnDeserializationError()
- {
- recordGenerator.generate(true, false, messageSender);
-
- int numberOfValidMessages =
- recordGenerator.getNumberOfMessages() -
- recordGenerator.getNumberOfPoisonPills();
-
- await(numberOfValidMessages + " records received")
- .atMost(Duration.ofSeconds(30))
- .pollInterval(Duration.ofSeconds(1))
- .until(() -> recordHandler.receivedMessages >= numberOfValidMessages);
- await(recordGenerator.getNumberOfPoisonPills() + " poison-pills received")
- .atMost(Duration.ofSeconds(30))
- .pollInterval(Duration.ofSeconds(1))
- .until(() -> deadLetterTopicConsumer.messages.size() == recordGenerator.getNumberOfPoisonPills());
-
- await("Offsets committed")
- .atMost(Duration.ofSeconds(10))
- .pollInterval(Duration.ofSeconds(1))
- .untilAsserted(() ->
- {
- checkSeenOffsetsForProgress();
- assertSeenOffsetsEqualCommittedOffsets(recordHandler.seenOffsets);
- });
-
- assertThat(endlessConsumer.running())
- .describedAs("Consumer should still be running")
- .isTrue();
-
- endlessConsumer.stop();
- recordGenerator.assertBusinessLogic();
- }
-
- @Test
- @SkipWhenErrorCannotBeGenerated(logicError = true)
- void commitsOffsetsOfUnseenRecordsOnLogicError()
- {
- recordGenerator.generate(false, true, messageSender);
-
- int numberOfValidMessages =
- recordGenerator.getNumberOfMessages() -
- recordGenerator.getNumberOfLogicErrors();
-
- await(numberOfValidMessages + " records received")
- .atMost(Duration.ofSeconds(30))
- .pollInterval(Duration.ofSeconds(1))
- .until(() -> recordHandler.receivedMessages >= numberOfValidMessages);
- await(recordGenerator.getNumberOfLogicErrors() + " logic-errors received")
- .atMost(Duration.ofSeconds(30))
- .pollInterval(Duration.ofSeconds(1))
- .until(() -> deadLetterTopicConsumer.messages.size() == recordGenerator.getNumberOfLogicErrors());
-
- await("Offsets committed")
- .atMost(Duration.ofSeconds(10))
- .pollInterval(Duration.ofSeconds(1))
- .untilAsserted(() ->
- {
- checkSeenOffsetsForProgress();
- assertSeenOffsetsEqualCommittedOffsets(recordHandler.seenOffsets);
- });
-
- assertThat(endlessConsumer.running())
- .describedAs("Consumer should still be running")
- .isTrue();
-
- endlessConsumer.stop();
- recordGenerator.assertBusinessLogic();
- }
-
-
- /** Helper methods for the verification of expectations */
-
- void assertSeenOffsetsEqualCommittedOffsets(Map<TopicPartition, Long> offsetsToCheck)
- {
- doForCurrentOffsets((tp, offset) ->
- {
- Long expected = offsetsToCheck.get(tp) + 1;
- log.debug("Checking, if the offset {} for {} is exactly {}", offset, tp, expected);
- assertThat(offset)
- .describedAs("Committed offset corresponds to the offset of the consumer")
- .isEqualTo(expected);
- });
- }
-
- void assertSeenOffsetsAreBehindCommittedOffsets(Map<TopicPartition, Long> offsetsToCheck)
- {
- List<Boolean> isOffsetBehindSeen = new LinkedList<>();
-
- doForCurrentOffsets((tp, offset) ->
- {
- Long expected = offsetsToCheck.get(tp) + 1;
- log.debug("Checking, if the offset {} for {} is at most {}", offset, tp, expected);
- assertThat(offset)
- .describedAs("Committed offset must be at most equal to the offset of the consumer")
- .isLessThanOrEqualTo(expected);
- isOffsetBehindSeen.add(offset < expected);
- });
-
- assertThat(isOffsetBehindSeen.stream().reduce(false, (result, next) -> result | next))
- .describedAs("Committed offsets are behind seen offsets")
- .isTrue();
- }
-
- void checkSeenOffsetsForProgress()
- {
- // Be sure, that some messages were consumed...!
- Set<TopicPartition> withProgress = new HashSet<>();
- partitions().forEach(tp ->
- {
- Long oldOffset = oldOffsets.get(tp) + 1;
- Long newOffset = recordHandler.seenOffsets.get(tp) + 1;
- if (!oldOffset.equals(newOffset))
- {
- log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
- withProgress.add(tp);
- }
- });
- assertThat(withProgress)
- .describedAs("Some offsets must have changed, compared to the old offset-positions")
- .isNotEmpty();
- }
-
-
- /** Helper methods for setting up and running the tests */
-
- void seekToEnd()
- {
- offsetConsumer.assign(partitions());
- offsetConsumer.seekToEnd(partitions());
- partitions().forEach(tp ->
- {
- // seekToEnd() works lazily: it only takes effect on poll()/position()
- Long offset = offsetConsumer.position(tp);
- log.info("New position for {}: {}", tp, offset);
- });
- // The new positions must be commited!
- offsetConsumer.commitSync();
- offsetConsumer.unsubscribe();
- }
-
- void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
- {
- offsetConsumer.assign(partitions());
- partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
- offsetConsumer.unsubscribe();
- }
-
- List<TopicPartition> partitions()
- {
- return
- IntStream
- .range(0, PARTITIONS)
- .mapToObj(partition -> new TopicPartition(TOPIC, partition))
- .collect(Collectors.toList());
- }
-
-
- public interface RecordGenerator
- {
- void generate(
- boolean poisonPills,
- boolean logicErrors,
- Consumer<ProducerRecord<Bytes, Bytes>> messageSender);
-
- int getNumberOfMessages();
- int getNumberOfPoisonPills();
- int getNumberOfLogicErrors();
-
- default boolean canGeneratePoisonPill()
- {
- return true;
- }
-
- default boolean canGenerateLogicError()
- {
- return true;
- }
-
- default void assertBusinessLogic()
- {
- log.debug("No business-logic to assert");
- }
- }
-
- void sendMessage(ProducerRecord<Bytes, Bytes> record)
- {
- testRecordProducer.send(record, (metadata, e) ->
- {
- if (metadata != null)
- {
- log.debug(
- "{}|{} - {}={}",
- metadata.partition(),
- metadata.offset(),
- record.key(),
- record.value());
- }
- else
- {
- log.warn(
- "Exception for {}={}: {}",
- record.key(),
- record.value(),
- e.toString());
- }
- });
- }
-
-
- @BeforeEach
- public void init()
- {
- Properties props;
- props = new Properties();
- props.put("bootstrap.servers", kafkaProperties.getBootstrapServers());
- props.put("linger.ms", 100);
- props.put("key.serializer", BytesSerializer.class.getName());
- props.put("value.serializer", BytesSerializer.class.getName());
- testRecordProducer = new KafkaProducer<>(props);
-
- props = new Properties();
- props.put("bootstrap.servers", kafkaProperties.getBootstrapServers());
- props.put("client.id", "OFFSET-CONSUMER");
- props.put("group.id", kafkaProperties.getConsumer().getGroupId());
- props.put("key.deserializer", BytesDeserializer.class.getName());
- props.put("value.deserializer", BytesDeserializer.class.getName());
- offsetConsumer = new KafkaConsumer<>(props);
-
- mongoClient.getDatabase(mongoProperties.getDatabase()).drop();
- seekToEnd();
-
- oldOffsets = new HashMap<>();
- recordHandler.seenOffsets = new HashMap<>();
- recordHandler.receivedMessages = 0;
-
- deadLetterTopicConsumer.messages.clear();
-
- doForCurrentOffsets((tp, offset) ->
- {
- oldOffsets.put(tp, offset - 1);
- recordHandler.seenOffsets.put(tp, offset - 1);
- });
-
- endlessConsumer.start();
- }
-
- @AfterEach
- public void deinit()
- {
- try
- {
- endlessConsumer.stop();
- }
- catch (Exception e)
- {
- log.debug("{}", e.toString());
- }
-
- try
- {
- testRecordProducer.close();
- offsetConsumer.close();
- }
- catch (Exception e)
- {
- log.info("Exception while stopping the consumer: {}", e.toString());
- }
- }
-
-
- @TestConfiguration
- @Import(ApplicationConfiguration.class)
- public static class Configuration
- {
- @Bean
- public RecordHandler recordHandler(RecordHandler applicationRecordHandler)
- {
- return new TestRecordHandler(applicationRecordHandler);
- }
-
- @Bean(destroyMethod = "close")
- public org.apache.kafka.clients.consumer.Consumer<String, Message> kafkaConsumer(ConsumerFactory<String, Message> factory)
- {
- return factory.createConsumer();
- }
-
- @Bean
- public ConcurrentKafkaListenerContainerFactory<String, String> dltContainerFactory(
- KafkaProperties properties)
- {
- Map<String, Object> consumerProperties = new HashMap<>();
-
- consumerProperties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServers());
- consumerProperties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
- consumerProperties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
- consumerProperties.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
-
- DefaultKafkaConsumerFactory dltConsumerFactory =
- new DefaultKafkaConsumerFactory<>(consumerProperties);
- ConcurrentKafkaListenerContainerFactory<String, String> factory =
- new ConcurrentKafkaListenerContainerFactory<>();
- factory.setConsumerFactory(dltConsumerFactory);
- return factory;
- }
-
- @Bean
- public DeadLetterTopicConsumer deadLetterTopicConsumer()
- {
- return new DeadLetterTopicConsumer();
- }
- }
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import org.junit.jupiter.api.extension.ExtendWith;
-
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-
-
-@Retention(RetentionPolicy.RUNTIME)
-@ExtendWith(ErrorCannotBeGeneratedCondition.class)
-public @interface SkipWhenErrorCannotBeGenerated
-{
- boolean poisonPill() default false;
- boolean logicError() default false;
-}
+++ /dev/null
-package de.juplo.kafka;
-
-import lombok.RequiredArgsConstructor;
-import org.apache.kafka.common.TopicPartition;
-
-import java.util.List;
-import java.util.Map;
-
-
-@RequiredArgsConstructor
-public class TestRecordHandler implements RecordHandler
-{
- private final RecordHandler handler;
-
- Map<TopicPartition, Long> seenOffsets;
- int receivedMessages;
-
-
- public void onNewRecord(
- String topic,
- Integer partition,
- Long offset,
- Message messgage)
- {
- seenOffsets.put(new TopicPartition(topic, partition), offset);
- receivedMessages++;
- }
-
- @Override
- public void addNumber(
- String topic,
- Integer partition,
- Long offset,
- String user,
- MessageAddNumber message)
- {
- this.onNewRecord(topic, partition, offset, message);
- handler.addNumber(topic, partition, offset, user, message);
- }
-
- @Override
- public void calculateSum(
- String topic,
- Integer partition,
- Long offset,
- String user,
- MessageCalculateSum message)
- {
- this.onNewRecord(topic, partition, offset, message);
- handler.calculateSum(topic, partition, offset, user, message);
- }
-}
projects / demos / kafka / training / commitdiff