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Remove the use of a consumer group for StreamableKafkaMessageSource.
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...main/java/org/axonframework/extensions/kafka/eventhandling/consumer/ConsumerSeekUtil.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| /* | ||
| * Copyright (c) 2010-2022. Axon Framework | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| package org.axonframework.extensions.kafka.eventhandling.consumer; | ||
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| import org.apache.kafka.clients.consumer.Consumer; | ||
| import org.apache.kafka.common.TopicPartition; | ||
| import org.axonframework.extensions.kafka.eventhandling.consumer.streamable.KafkaTrackingToken; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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|
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| import java.lang.invoke.MethodHandles; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.function.Supplier; | ||
| import java.util.stream.Collectors; | ||
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|
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| /** | ||
| * Contains static util functions related to the Kafka consumer related to seeking to certain offsets. | ||
| * | ||
| * @author Gerard Klijs | ||
| * @since 4.5.4 | ||
| */ | ||
| public class ConsumerSeekUtil { | ||
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| private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); | ||
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| private ConsumerSeekUtil() { | ||
| //prevent instantiation | ||
| } | ||
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| /** | ||
| * Assigns the correct {@link TopicPartition partitions} to the consumer, and seeks to the correct offset, using the | ||
| * {@link KafkaTrackingToken}, defaulting to the head of the partition. So for each {@link TopicPartition partition} | ||
| * that belongs to the {@code topics}, either it will start reading from the next record of the partition, if | ||
| * included in the token, or else from the start. | ||
| * | ||
| * @param consumer a Kafka consumer instance | ||
| * @param tokenSupplier a function that returns the current {@link KafkaTrackingToken} | ||
| * @param topics a list of topics that will be assigned to the consumer | ||
| */ | ||
| public static void seekToCurrentPositions(Consumer<?, ?> consumer, Supplier<KafkaTrackingToken> tokenSupplier, | ||
| List<String> topics) { | ||
| List<TopicPartition> all = consumer.listTopics().entrySet() | ||
| .stream() | ||
| .filter(e -> topics.contains(e.getKey())) | ||
| .flatMap(e -> e.getValue().stream()) | ||
| .map(partitionInfo -> new TopicPartition(partitionInfo.topic(), | ||
| partitionInfo.partition())) | ||
| .collect(Collectors.toList()); | ||
| consumer.assign(all); | ||
| KafkaTrackingToken currentToken = tokenSupplier.get(); | ||
| all.forEach(assignedPartition -> { | ||
| Map<TopicPartition, Long> tokenPartitionPositions = currentToken.getPositions(); | ||
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| long offset = 0L; | ||
| if (tokenPartitionPositions.containsKey(assignedPartition)) { | ||
| offset = tokenPartitionPositions.get(assignedPartition) + 1; | ||
| } | ||
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| logger.info("Seeking topic-partition [{}] with offset [{}]", assignedPartition, offset); | ||
| consumer.seek(assignedPartition, offset); | ||
| }); | ||
| } | ||
| } |
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