spring-kafka SeekToCurrentBatchErrorHandler 源码
spring-kafka SeekToCurrentBatchErrorHandler 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/listener/SeekToCurrentBatchErrorHandler.java
/*
* Copyright 2017-2022 the original author or authors.
*
* 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
*
* https://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 org.springframework.kafka.listener;
import java.util.LinkedHashMap;
import java.util.stream.Collectors;
import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.springframework.kafka.KafkaException;
import org.springframework.lang.Nullable;
import org.springframework.util.backoff.BackOff;
import org.springframework.util.backoff.BackOffExecution;
/**
* An error handler that seeks to the current offset for each topic in a batch of records.
* Used to rewind partitions after a message failure so that the batch can be replayed.
*
* @author Gary Russell
* @since 2.1
*/
@SuppressWarnings("deprecation")
class SeekToCurrentBatchErrorHandler extends KafkaExceptionLogLevelAware
implements ContainerAwareBatchErrorHandler {
private final ThreadLocal<BackOffExecution> backOffs = new ThreadLocal<>(); // Intentionally not static
private final ThreadLocal<Long> lastIntervals = new ThreadLocal<>(); // Intentionally not static
private BackOff backOff;
/**
* Set a {@link BackOff} to suspend the thread after performing the seek. Since this
* error handler can never "recover" after retries are exhausted, if the back off
* returns STOP, then the previous interval is used.
* @param backOff the back off.
* @since 2.3
*/
public void setBackOff(BackOff backOff) {
this.backOff = backOff;
}
@Override
public void handle(Exception thrownException, @Nullable ConsumerRecords<?, ?> data, Consumer<?, ?> consumer,
MessageListenerContainer container) {
if (data != null) {
data.partitions()
.stream()
.collect(
Collectors.toMap(tp -> tp,
tp -> data.records(tp).get(0).offset(), (u, v) -> (long) v, LinkedHashMap::new))
.forEach(consumer::seek);
if (this.backOff != null) {
try {
ListenerUtils.unrecoverableBackOff(this.backOff, this.backOffs, this.lastIntervals, container);
}
catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
throw new KafkaException("Seek to current after exception", getLogLevel(), thrownException);
}
}
@Override
public void clearThreadState() {
this.backOffs.remove();
this.lastIntervals.remove();
}
}
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