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/*
 * Copyright 2017-2018 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
 *
 *      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 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;

/**
 * An error handler that seeks to the current offset for each topic in batch of records.
 * Used to rewind partitions after a message failure so that the batch can be replayed.
 *
 * @author Gary Russell
 * @since 2.1
 *
 */
public class SeekToCurrentBatchErrorHandler implements ContainerAwareBatchErrorHandler {

	@Override
	public void handle(Exception thrownException, ConsumerRecords data, Consumer consumer,
			MessageListenerContainer container) {
		data.partitions()
				.stream()
				.collect(
						Collectors.toMap(tp -> tp,
								tp -> data.records(tp).get(0).offset(),
								(u, v) -> (long) v,
								LinkedHashMap::new))
				.forEach(consumer::seek);

		throw new KafkaException("Seek to current after exception", thrownException);
	}

}




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