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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2020 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.policy.apex.plugins.event.carrier.kafka;
import java.util.Properties;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.onap.policy.apex.service.engine.event.ApexEventException;
import org.onap.policy.apex.service.engine.event.ApexPluginsEventProducer;
import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Concrete implementation of an Apex event producer that sends events using Kafka.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class ApexKafkaProducer extends ApexPluginsEventProducer {
// Get a reference to the logger
private static final Logger LOGGER = LoggerFactory.getLogger(ApexKafkaProducer.class);
// The Kafka parameters read from the parameter service
private KafkaCarrierTechnologyParameters kafkaProducerProperties;
// The Kafka Producer used to send events using Kafka
private Producer<String, Object> kafkaProducer;
@Override
public void init(final String producerName, final EventHandlerParameters producerParameters)
throws ApexEventException {
this.name = producerName;
// Check and get the Kafka Properties
if (!(producerParameters.getCarrierTechnologyParameters() instanceof KafkaCarrierTechnologyParameters)) {
String message = "specified producer properties are not applicable to a Kafka producer (" + this.name + ")";
LOGGER.warn(message);
throw new ApexEventException(message);
}
kafkaProducerProperties =
(KafkaCarrierTechnologyParameters) producerParameters.getCarrierTechnologyParameters();
}
/**
* {@inheritDoc}.
*/
@Override
public void sendEvent(final long executionId, final Properties executionProperties, final String eventName,
final Object event) {
super.sendEvent(executionId, executionProperties, eventName, event);
// Kafka producer must be started in the same thread as it is stopped, so we must start it here
if (kafkaProducer == null) {
// Kick off the Kafka producer
kafkaProducer = new KafkaProducer<>(kafkaProducerProperties.getKafkaProducerProperties());
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("event producer {} is ready to send to topics: {}", this.name,
kafkaProducerProperties.getProducerTopic());
}
}
kafkaProducer.send(new ProducerRecord<String, Object>(kafkaProducerProperties.getProducerTopic(), name, event));
if (LOGGER.isTraceEnabled()) {
LOGGER.trace("event sent from engine using {} to topic {} : {} ", this.name,
kafkaProducerProperties.getProducerTopic(), event);
}
}
/**
* {@inheritDoc}.
*/
@Override
public void stop() {
if (kafkaProducer != null) {
kafkaProducer.flush();
kafkaProducer.close();
}
}
}
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