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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2023 Nordix Foundation
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.cps.ncmp.dmi.config.kafka;
import io.cloudevents.CloudEvent;
import java.util.Map;
import lombok.RequiredArgsConstructor;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.kafka.annotation.EnableKafka;
import org.springframework.kafka.core.ConsumerFactory;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
import org.springframework.kafka.core.DefaultKafkaProducerFactory;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.core.ProducerFactory;
import org.springframework.kafka.support.serializer.JsonDeserializer;
import org.springframework.kafka.support.serializer.JsonSerializer;
/**
* kafka Configuration for legacy and cloud events.
*
* @param <T> valid legacy event to be published over the wire.
*/
@Configuration
@EnableKafka
@RequiredArgsConstructor
public class KafkaConfig<T> {
private final KafkaProperties kafkaProperties;
/**
* This sets the strategy for creating legacy Kafka producer instance from kafka properties defined into
* application.yml and replaces value-serializer by JsonSerializer.
*
* @return legacy event producer instance.
*/
@Bean
public ProducerFactory<String, T> legacyEventProducerFactory() {
final Map<String, Object> producerConfigProperties = kafkaProperties.buildProducerProperties();
producerConfigProperties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, JsonSerializer.class);
return new DefaultKafkaProducerFactory<>(producerConfigProperties);
}
/**
* The ConsumerFactory implementation is to produce new legacy instance for provided kafka properties defined
* into application.yml and replaces deserializer-value by JsonDeserializer.
*
* @return an instance of legacy consumer factory.
*/
@Bean
public ConsumerFactory<String, T> legacyEventConsumerFactory() {
final Map<String, Object> consumerConfigProperties = kafkaProperties.buildConsumerProperties();
consumerConfigProperties.put("spring.deserializer.value.delegate.class", JsonDeserializer.class);
return new DefaultKafkaConsumerFactory<>(consumerConfigProperties);
}
/**
* This sets the strategy for creating cloud Kafka producer instance from kafka properties defined into
* application.yml with CloudEventSerializer.
*
* @return cloud event producer instance.
*/
@Bean
public ProducerFactory<String, CloudEvent> cloudEventProducerFactory() {
final Map<String, Object> producerConfigProperties = kafkaProperties.buildProducerProperties();
return new DefaultKafkaProducerFactory<>(producerConfigProperties);
}
/**
* The ConsumerFactory implementation to produce new legacy instance for provided kafka properties defined
* into application.yml having CloudEventDeserializer as deserializer-value.
*
* @return an instance of cloud consumer factory.
*/
@Bean
public ConsumerFactory<String, CloudEvent> cloudEventConsumerFactory() {
final Map<String, Object> consumerConfigProperties = kafkaProperties.buildConsumerProperties();
return new DefaultKafkaConsumerFactory<>(consumerConfigProperties);
}
/**
* A legacy Kafka event template for executing high-level operations. The legacy producer factory ensure this.
*
* @return an instance of legacy Kafka template.
*/
@Bean
@Primary
public KafkaTemplate<String, T> legacyEventKafkaTemplate() {
final KafkaTemplate<String, T> kafkaTemplate = new KafkaTemplate<>(legacyEventProducerFactory());
kafkaTemplate.setConsumerFactory(legacyEventConsumerFactory());
return kafkaTemplate;
}
/**
* A cloud Kafka event template for executing high-level operations. The cloud producer factory ensure this.
*
* @return an instance of cloud Kafka template.
*/
@Bean
public KafkaTemplate<String, CloudEvent> cloudEventKafkaTemplate() {
final KafkaTemplate<String, CloudEvent> kafkaTemplate = new KafkaTemplate<>(cloudEventProducerFactory());
kafkaTemplate.setConsumerFactory(cloudEventConsumerFactory());
return kafkaTemplate;
}
}
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