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A library of utilities, helpers and higher-level APIs for the
Kafka client library
/*
* Copyright 2019 EPAM Systems
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy
* of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.epam.eco.commons.kafka;
import java.io.Closeable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
import java.util.TreeMap;
import java.util.function.Function;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.Validate;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.common.PartitionInfo;
import org.apache.kafka.common.TopicPartition;
/**
* @author Andrei_Tytsik
*/
public abstract class KafkaUtils {
public static final Pattern TOPIC_PARTITION_PATTERN = Pattern.compile("^(.+)-(0|[1-9]\\d*)$");
private KafkaUtils() {
}
public static TopicPartition[] getAssignmentAsArray(KafkaConsumer consumer) {
return getAssignmentAsList(consumer).stream().
toArray(TopicPartition[]::new);
}
public static List getAssignmentAsList(KafkaConsumer consumer) {
Validate.notNull(consumer, "Consumer is null");
return new ArrayList<>(consumer.assignment());
}
public static TopicPartition[] getTopicPartitionsAsArray(
KafkaConsumer consumer,
String ... topicNames) {
return getTopicPartitionsAsList(consumer, Arrays.asList(topicNames)).stream().
toArray(TopicPartition[]::new);
}
public static List getTopicPartitionsAsList(
KafkaConsumer consumer,
String ... topicNames) {
return getTopicPartitionsAsList(consumer, Arrays.asList(topicNames));
}
public static TopicPartition[] getTopicPartitionsAsArray(
KafkaConsumer consumer,
Collection topicNames) {
return getTopicPartitionsAsList(consumer, topicNames).stream().
toArray(TopicPartition[]::new);
}
public static List getTopicPartitionsAsList(
KafkaConsumer consumer,
Collection topicNames) {
Validate.notNull(consumer, "Consumer is null");
Validate.notNull(topicNames, "Collection of topic names is null");
if (CollectionUtils.isEmpty(topicNames)) {
return Collections.emptyList();
}
List topicPartitions = new ArrayList<>();
for (String topicName : topicNames) {
List partitionInfos = consumer.partitionsFor(topicName);
if (CollectionUtils.isEmpty(partitionInfos)) {
throw new RuntimeException("Partitions metadata not found for topic " + topicName);
}
partitionInfos.forEach(
info -> topicPartitions.add(new TopicPartition(info.topic(), info.partition())));
}
return topicPartitions;
}
public static TopicPartition[] getTopicPartitionsAsArray(
KafkaProducer producer,
String ... topicNames) {
return getTopicPartitionsAsList(producer, Arrays.asList(topicNames)).stream().
toArray(TopicPartition[]::new);
}
public static List getTopicPartitionsAsList(
KafkaProducer producer,
String ... topicNames) {
return getTopicPartitionsAsList(producer, Arrays.asList(topicNames));
}
public static TopicPartition[] getTopicPartitionsAsArray(
KafkaProducer producer,
Collection topicNames) {
return getTopicPartitionsAsList(producer, topicNames).stream().
toArray(TopicPartition[]::new);
}
public static List getTopicPartitionsAsList(
KafkaProducer producer,
Collection topicNames) {
Validate.notNull(producer, "Producer is null");
Validate.notNull(topicNames, "Collection of topic names is null");
if (CollectionUtils.isEmpty(topicNames)) {
return Collections.emptyList();
}
List topicPartitions = new ArrayList<>();
for (String topicName : topicNames) {
List partitionInfos = producer.partitionsFor(topicName);
if (CollectionUtils.isEmpty(partitionInfos)) {
throw new RuntimeException("Partitions metadata not found for topic " + topicName);
}
partitionInfos.forEach(
info -> topicPartitions.add(new TopicPartition(info.topic(), info.partition())));
}
return topicPartitions;
}
public static TopicPartition parseTopicPartition(String string) {
Validate.notBlank(string, "TopicPartition string is blank");
Matcher matcher = TOPIC_PARTITION_PATTERN.matcher(string);
if (!matcher.find()) {
throw new IllegalArgumentException(
String.format("Invalid TopicPartition string '%s'", string));
}
String topic = matcher.group(1);
int partition = Integer.parseInt(matcher.group(2));
return new TopicPartition(
topic,
partition);
}
public static void closeQuietly(Closeable closeable) {
if (closeable == null) {
return;
}
try {
closeable.close();
} catch (Exception ex) {
// ignore
}
}
@SuppressWarnings({ "unchecked", "rawtypes" })
public static Map extractSmallestOffsets(ConsumerRecords records) {
Validate.notNull(records, "ConsumerRecords object is null");
Set partitions = records.partitions();
Map smallestOffsets = new HashMap<>((int) (partitions.size() / 0.75));
for (TopicPartition partition : partitions) {
List> recordsPerPartition =
((ConsumerRecords)records).records(partition);
if (recordsPerPartition.isEmpty()) {
continue;
}
ConsumerRecord firstRecordInPartition = recordsPerPartition.get(0);
smallestOffsets.put(partition, firstRecordInPartition.offset());
}
return smallestOffsets;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
public static Map extractLargestOffsets(ConsumerRecords records) {
Validate.notNull(records, "ConsumerRecords object is null");
Set partitions = records.partitions();
Map largestOffsets = new HashMap<>((int) (partitions.size() / 0.75));
for (TopicPartition partition : partitions) {
List> recordsPerPartition =
((ConsumerRecords)records).records(partition);
if (recordsPerPartition.isEmpty()) {
continue;
}
ConsumerRecord lastRecordInPartition =
recordsPerPartition.get(recordsPerPartition.size() - 1);
largestOffsets.put(partition, lastRecordInPartition.offset());
}
return largestOffsets;
}
public static Map getConsumerPositions(KafkaConsumer consumer) {
Validate.notNull(consumer, "Consumer is null");
Set partitions = consumer.assignment();
if (partitions == null || partitions.isEmpty()) {
return Collections.emptyMap();
}
return partitions.stream().
collect(Collectors.toMap(
Function.identity(),
partition -> consumer.position(partition)));
}
public static List extractTopicNamesAsList(Collection partitions) {
Validate.notNull(partitions, "Collection of partitions is null");
return partitions.stream().
filter(Objects::nonNull).
map(TopicPartition::topic).
distinct().
collect(Collectors.toList());
}
public static List extractTopicNamesAsSortedList(Collection partitions) {
Validate.notNull(partitions, "Collection of partitions is null");
return partitions.stream().
filter(Objects::nonNull).
map(TopicPartition::topic).
distinct().
sorted().
collect(Collectors.toList());
}
public static Set extractTopicNamesAsSet(Collection partitions) {
Validate.notNull(partitions, "Collection of partitions is null");
return partitions.stream().
filter(Objects::nonNull).
map(TopicPartition::topic).
collect(Collectors.toSet());
}
public static Set extractTopicNamesAsSortedSet(Collection partitions) {
Validate.notNull(partitions, "Collection of partitions is null");
return partitions.stream().
filter(Objects::nonNull).
map(TopicPartition::topic).
collect(Collectors.toSet());
}
public static Map sortedByTopicPartitionKeyMap(Map map) {
Validate.notNull(map, "Map is null");
return map.entrySet().stream().
collect(
Collectors.toMap(
Entry::getKey,
Entry::getValue,
(a, b) -> b,
() -> new TreeMap<>(TopicPartitionComparator.INSTANCE)));
}
public static long calculateConsumerLag(OffsetRange topicOffsetRange, long consumerOffset) {
Validate.notNull(topicOffsetRange, "Offset range is null");
Validate.isTrue(consumerOffset >= 0, "Consumer offset is invalid");
if (consumerOffset < topicOffsetRange.getSmallest()) {
return topicOffsetRange.getSize();
}
long largestConsumableOffset =
topicOffsetRange.isLargestInclusive() ?
topicOffsetRange.getLargest() + 1 :
topicOffsetRange.getLargest();
if (consumerOffset > largestConsumableOffset) {
return -1;
}
return largestConsumableOffset - consumerOffset;
}
}
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