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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;
+ }
+
+}