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Spring Kafka Support

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/*
 * Copyright 2018-2021 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.transaction;

import org.springframework.kafka.core.ProducerFactory;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.util.Assert;

/**
 * A {@link org.springframework.data.transaction.ChainedTransactionManager} that has
 * exactly one {@link KafkaAwareTransactionManager} in the chain.
 *
 * @param  the key type.
 * @param  the value type.
 *
 * @author Gary Russell
 * @since 2.1.3
 * @deprecated Refer to the
 * {@link org.springframework.data.transaction.ChainedTransactionManager} javadocs.
 *
 */
@Deprecated
public class ChainedKafkaTransactionManager extends org.springframework.data.transaction.ChainedTransactionManager
		implements KafkaAwareTransactionManager {

	private final KafkaAwareTransactionManager kafkaTransactionManager;

	/**
	 * Construct an instance with the provided {@link PlatformTransactionManager}s.
	 * @param transactionManagers the transaction managers.
	 */
	@SuppressWarnings("unchecked")
	public ChainedKafkaTransactionManager(PlatformTransactionManager... transactionManagers) {
		super(transactionManagers);
		KafkaAwareTransactionManager uniqueKafkaTransactionManager = null;
		for (PlatformTransactionManager tm : transactionManagers) {
			if (tm instanceof KafkaAwareTransactionManager) {
				Assert.isNull(uniqueKafkaTransactionManager, "Only one KafkaAwareTransactionManager is allowed");
				uniqueKafkaTransactionManager = (KafkaAwareTransactionManager) tm;
			}
		}
		Assert.notNull(uniqueKafkaTransactionManager, "Exactly one KafkaAwareTransactionManager is required");
		this.kafkaTransactionManager = uniqueKafkaTransactionManager;
	}

	@Override
	public ProducerFactory getProducerFactory() {
		return this.kafkaTransactionManager.getProducerFactory();
	}

}