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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2022-2023 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.api.impl.events;
import io.cloudevents.CloudEvent;
import java.util.Map;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.header.Headers;
import org.apache.kafka.common.header.internals.RecordHeaders;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.support.SendResult;
import org.springframework.stereotype.Service;
import org.springframework.util.SerializationUtils;
import org.springframework.util.concurrent.ListenableFuture;
import org.springframework.util.concurrent.ListenableFutureCallback;
/**
* EventsPublisher to publish events.
*/
@Slf4j
@Service
@RequiredArgsConstructor
public class EventsPublisher<T> {
/**
* KafaTemplate for legacy (non-cloud) events.
*
* @deprecated Cloud events should be used. Will address soon as part of https://jira.onap.org/browse/CPS-1717
*/
@Deprecated(forRemoval = true)
private final KafkaTemplate<String, T> legacyKafkaEventTemplate;
private final KafkaTemplate<String, CloudEvent> cloudEventKafkaTemplate;
/**
* Generic CloudEvent publisher.
*
* @param topicName valid topic name
* @param eventKey message key
* @param event message payload
*/
public void publishCloudEvent(final String topicName, final String eventKey, final CloudEvent event) {
final ListenableFuture<SendResult<String, CloudEvent>> eventFuture
= cloudEventKafkaTemplate.send(topicName, eventKey, event);
eventFuture.addCallback(handleCallback(topicName));
}
/**
* Generic Event publisher.
*
* @param topicName valid topic name
* @param eventKey message key
* @param event message payload
* @deprecated Cloud events should be used. Will address soon as part of https://jira.onap.org/browse/CPS-1717
*/
@Deprecated(forRemoval = true)
public void publishEvent(final String topicName, final String eventKey, final T event) {
final ListenableFuture<SendResult<String, T>> eventFuture
= legacyKafkaEventTemplate.send(topicName, eventKey, event);
eventFuture.addCallback(handleCallback(topicName));
}
/**
* Generic Event Publisher with headers.
*
* @param topicName valid topic name
* @param eventKey message key
* @param eventHeaders event headers
* @param event message payload
*/
public void publishEvent(final String topicName, final String eventKey, final Headers eventHeaders, final T event) {
final ProducerRecord<String, T> producerRecord =
new ProducerRecord<>(topicName, null, eventKey, event, eventHeaders);
final ListenableFuture<SendResult<String, T>> eventFuture = legacyKafkaEventTemplate.send(producerRecord);
eventFuture.addCallback(handleCallback(topicName));
}
/**
* Generic Event Publisher with headers.
*
* @param topicName valid topic name
* @param eventKey message key
* @param eventHeaders map of event headers
* @param event message payload
*/
public void publishEvent(final String topicName, final String eventKey, final Map<String, Object> eventHeaders,
final T event) {
publishEvent(topicName, eventKey, convertToKafkaHeaders(eventHeaders), event);
}
private ListenableFutureCallback<SendResult<String, ?>> handleCallback(final String topicName) {
return new ListenableFutureCallback<>() {
@Override
public void onFailure(final Throwable throwable) {
log.error("Unable to publish event to topic : {} due to {}", topicName, throwable.getMessage());
}
@Override
public void onSuccess(final SendResult<String, ?> sendResult) {
log.debug("Successfully published event to topic : {} , Event : {}",
sendResult.getRecordMetadata().topic(), sendResult.getProducerRecord().value());
}
};
}
private Headers convertToKafkaHeaders(final Map<String, Object> eventMessageHeaders) {
final Headers eventHeaders = new RecordHeaders();
eventMessageHeaders.forEach((key, value) -> eventHeaders.add(key, SerializationUtils.serialize(value)));
return eventHeaders;
}
}
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