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CoreApp.java
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CoreApp.java
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package io.confluent.parallelconsumer.examples.core;
/*-
* Copyright (C) 2020-2022 Confluent, Inc.
*/
import io.confluent.parallelconsumer.ParallelConsumerOptions;
import io.confluent.parallelconsumer.ParallelStreamProcessor;
import io.confluent.parallelconsumer.RecordContext;
import lombok.Value;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.RandomUtils;
import org.apache.commons.lang3.concurrent.CircuitBreakingException;
import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;
import java.time.Duration;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Collectors;
import static io.confluent.csid.utils.StringUtils.msg;
import static io.confluent.parallelconsumer.ParallelConsumerOptions.ProcessingOrder.KEY;
import static pl.tlinkowski.unij.api.UniLists.of;
/**
* Basic core examples
*/
@Slf4j
public class CoreApp {
String inputTopic = "input-topic-" + RandomUtils.nextInt();
String outputTopic = "output-topic-" + RandomUtils.nextInt();
Consumer<String, String> getKafkaConsumer() {
return new KafkaConsumer<>(new Properties());
}
Producer<String, String> getKafkaProducer() {
return new KafkaProducer<>(new Properties());
}
ParallelStreamProcessor<String, String> parallelConsumer;
@SuppressWarnings("UnqualifiedFieldAccess")
void run() {
this.parallelConsumer = setupParallelConsumer();
postSetup();
// tag::example[]
parallelConsumer.poll(record ->
log.info("Concurrently processing a record: {}", record)
);
// end::example[]
}
protected void postSetup() {
// ignore
}
@SuppressWarnings({"FeatureEnvy", "MagicNumber"})
ParallelStreamProcessor<String, String> setupParallelConsumer() {
// tag::exampleSetup[]
Consumer<String, String> kafkaConsumer = getKafkaConsumer(); // <1>
Producer<String, String> kafkaProducer = getKafkaProducer();
var options = ParallelConsumerOptions.<String, String>builder()
.ordering(KEY) // <2>
.maxConcurrency(1000) // <3>
.consumer(kafkaConsumer)
.producer(kafkaProducer)
.build();
ParallelStreamProcessor<String, String> eosStreamProcessor =
ParallelStreamProcessor.createEosStreamProcessor(options);
eosStreamProcessor.subscribe(of(inputTopic)); // <4>
return eosStreamProcessor;
// end::exampleSetup[]
}
void close() {
this.parallelConsumer.close();
}
void runPollAndProduce() {
this.parallelConsumer = setupParallelConsumer();
postSetup();
// tag::exampleProduce[]
parallelConsumer.pollAndProduce(context -> {
var consumerRecord = context.getSingleRecord().getConsumerRecord();
var result = processBrokerRecord(consumerRecord);
return new ProducerRecord<>(outputTopic, consumerRecord.key(), result.payload);
}, consumeProduceResult -> {
log.debug("Message {} saved to broker at offset {}",
consumeProduceResult.getOut(),
consumeProduceResult.getMeta().offset());
}
);
// end::exampleProduce[]
}
private Result processBrokerRecord(ConsumerRecord<String, String> consumerRecord) {
return new Result("Some payload from " + consumerRecord.value());
}
@Value
static class Result {
String payload;
}
void customRetryDelay() {
// tag::customRetryDelay[]
final double multiplier = 0.5;
final int baseDelaySecond = 1;
ParallelConsumerOptions.<String, String>builder()
.retryDelayProvider(recordContext -> {
int numberOfFailedAttempts = recordContext.getNumberOfFailedAttempts();
long delayMillis = (long) (baseDelaySecond * Math.pow(multiplier, numberOfFailedAttempts) * 1000);
return Duration.ofMillis(delayMillis);
});
// end::customRetryDelay[]
}
void maxRetries() {
ParallelStreamProcessor<String, String> pc = ParallelStreamProcessor.createEosStreamProcessor(null);
// tag::maxRetries[]
final int maxRetries = 10;
final Map<ConsumerRecord<String, String>, Long> retriesCount = new ConcurrentHashMap<>();
pc.poll(context -> {
var consumerRecord = context.getSingleRecord().getConsumerRecord();
Long retryCount = retriesCount.computeIfAbsent(consumerRecord, ignore -> 0L);
if (retryCount < maxRetries) {
processRecord(consumerRecord);
// no exception, so completed - remove from map
retriesCount.remove(consumerRecord);
} else {
log.warn("Retry count {} exceeded max of {} for record {}", retryCount, maxRetries, consumerRecord);
// giving up, remove from map
retriesCount.remove(consumerRecord);
}
});
// end::maxRetries[]
}
private void processRecord(final ConsumerRecord<String, String> record) {
// no-op
}
void circuitBreaker() {
ParallelStreamProcessor<String, String> pc = ParallelStreamProcessor.createEosStreamProcessor(null);
// tag::circuitBreaker[]
final Map<String, Boolean> upMap = new ConcurrentHashMap<>();
pc.poll(context -> {
var consumerRecord = context.getSingleRecord().getConsumerRecord();
String serverId = extractServerId(consumerRecord);
boolean up = upMap.computeIfAbsent(serverId, ignore -> true);
if (!up) {
up = updateStatusOfSever(serverId);
}
if (up) {
try {
processRecord(consumerRecord);
} catch (CircuitBreakingException e) {
log.warn("Server {} is circuitBroken, will retry message when server is up. Record: {}", serverId, consumerRecord);
upMap.put(serverId, false);
}
// no exception, so set server status UP
upMap.put(serverId, true);
} else {
throw new RuntimeException(msg("Server {} currently down, will retry record latter {}", up, consumerRecord));
}
});
// end::circuitBreaker[]
}
private boolean updateStatusOfSever(final String serverId) {
return false;
}
private String extractServerId(final ConsumerRecord<String, String> consumerRecord) {
// no-op
return null;
}
void batching() {
// tag::batching[]
ParallelStreamProcessor.createEosStreamProcessor(ParallelConsumerOptions.<String, String>builder()
.consumer(getKafkaConsumer())
.producer(getKafkaProducer())
.maxConcurrency(100)
.batchSize(5) // <1>
.build());
parallelConsumer.poll(context -> {
// convert the batch into the payload for our processing
List<String> payload = context.stream()
.map(this::preparePayload)
.collect(Collectors.toList());
// process the entire batch payload at once
processBatchPayload(payload);
});
// end::batching[]
}
private void processBatchPayload(List<String> batchPayload) {
// example
}
private String preparePayload(RecordContext<String, String> rc) {
ConsumerRecord<String, String> consumerRecords = rc.getConsumerRecord();
int failureCount = rc.getNumberOfFailedAttempts();
return msg("{}, {}", consumerRecords, failureCount);
}
}