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/*-
* ============LICENSE_START=======================================================
* sdc-distribution-client
* ================================================================================
* Copyright (C) 2022 Nordix Foundation. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.sdc.utils.kafka;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Properties;
import java.util.UUID;
import org.apache.kafka.clients.CommonClientConfigs;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.config.SaslConfigs;
import org.apache.kafka.common.config.SslConfigs;
import org.apache.kafka.common.errors.InvalidGroupIdException;
import org.onap.sdc.impl.Configuration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Utility class that provides a KafkaConsumer to communicate with a kafka cluster
*/
public class SdcKafkaConsumer {
private static final Logger log = LoggerFactory.getLogger(SdcKafkaConsumer.class);
final KafkaConsumer<String, String> consumer;
private final int pollTimeout;
private String topicName;
/**
*
* @param configuration The config provided to the client
*/
public SdcKafkaConsumer(Configuration configuration) {
Properties props = new Properties();
props.put(CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG, configuration.getMsgBusAddress());
props.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, configuration.getKafkaSecurityProtocolConfig());
props.put(SaslConfigs.SASL_MECHANISM, configuration.getKafkaSaslMechanism());
props.put(SaslConfigs.SASL_JAAS_CONFIG, configuration.getKafkaSaslJaasConfig());
props.put(ConsumerConfig.GROUP_ID_CONFIG, configuration.getConsumerGroup());
props.put(ConsumerConfig.CLIENT_ID_CONFIG, configuration.getConsumerID() + "-consumer-" + UUID.randomUUID());
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "latest");
props.put(ConsumerConfig.ALLOW_AUTO_CREATE_TOPICS_CONFIG, false);
props.put(ConsumerConfig.MAX_POLL_INTERVAL_MS_CONFIG, configuration.getKafkaConsumerMaxPollInterval() * 1000);
props.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, configuration.getKafkaConsumerSessionTimeout() * 1000);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
consumer = new KafkaConsumer<>(props);
pollTimeout = configuration.getPollingTimeout();
}
/**
*
* @param topic The kafka topic to subscribe to
*/
public void subscribe(String topic) {
try {
consumer.subscribe(Collections.singleton(topic));
this.topicName = topic;
}
catch (InvalidGroupIdException e) {
log.error("Invalid Group {}", e.getMessage());
}
}
/**
*
* @return The list of records returned from the poll
*/
public List<String> poll() {
List<String> msgs = new ArrayList<>();
ConsumerRecords<String, String> records = consumer.poll(Duration.ofSeconds(pollTimeout));
for (ConsumerRecord<String, String> rec : records) {
msgs.add(rec.value());
}
return msgs;
}
/**
*
* @return The topic being polled by the consumer
*/
public String getTopicName() {
return topicName;
}
}
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