KafkaAnnotationDrivenConfiguration.java

/*
 * Copyright 2012-2017 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.boot.autoconfigure.kafka;

import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.annotation.EnableKafka;
import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.config.KafkaListenerConfigUtils;
import org.springframework.kafka.core.ConsumerFactory;

/**
 * Configuration for Kafka annotation-driven support.
 *
 * @author Gary Russell
 * @since 1.5.0
 */
@Configuration
@ConditionalOnClass(EnableKafka.class)
class KafkaAnnotationDrivenConfiguration {

	private final KafkaProperties properties;

	KafkaAnnotationDrivenConfiguration(KafkaProperties properties) {
		this.properties = properties;
	}

	@Bean
	@ConditionalOnMissingBean
	public ConcurrentKafkaListenerContainerFactoryConfigurer kafkaListenerContainerFactoryConfigurer() {
		ConcurrentKafkaListenerContainerFactoryConfigurer configurer = new ConcurrentKafkaListenerContainerFactoryConfigurer();
		configurer.setKafkaProperties(this.properties);
		return configurer;
	}

	@Bean
	@ConditionalOnMissingBean(name = "kafkaListenerContainerFactory")
	public ConcurrentKafkaListenerContainerFactory<?, ?> kafkaListenerContainerFactory(
			ConcurrentKafkaListenerContainerFactoryConfigurer configurer,
			ConsumerFactory<Object, Object> kafkaConsumerFactory) {
		ConcurrentKafkaListenerContainerFactory<Object, Object> factory = new ConcurrentKafkaListenerContainerFactory<>();
		configurer.configure(factory, kafkaConsumerFactory);
		return factory;
	}

	@EnableKafka
	@ConditionalOnMissingBean(name = KafkaListenerConfigUtils.KAFKA_LISTENER_ANNOTATION_PROCESSOR_BEAN_NAME)
	protected static class EnableKafkaConfiguration {

	}

}