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package org.onap.ccsdk.features.sdnr.wt.mountpointregistrar.kafka;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Properties;
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.errors.InvalidGroupIdException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Utility class that provides a KafkaConsumer to communicate with a kafka cluster
*/
public class VESMsgKafkaConsumer {
private static final Logger log = LoggerFactory.getLogger(VESMsgKafkaConsumer.class);
final KafkaConsumer<String, String> consumer;
private final int pollTimeout;
private String topicName;
private static final String DESERIALIZER_CLASS = "org.apache.kafka.common.serialization.StringDeserializer";
/**
*
* @param consumerProperties
* @param configuration The config provided to the client
*/
public VESMsgKafkaConsumer(Properties strimziKafkaProperties, Properties consumerProperties) {
Properties props = new Properties();
props.put(CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG, strimziKafkaProperties.getProperty("bootstrapServers"));
props.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, strimziKafkaProperties.getProperty("securityProtocol"));
props.put(SaslConfigs.SASL_MECHANISM, strimziKafkaProperties.getProperty("saslMechanism"));
props.put(SaslConfigs.SASL_JAAS_CONFIG, strimziKafkaProperties.getProperty("saslJaasConfig"));
props.put(ConsumerConfig.GROUP_ID_CONFIG,
consumerProperties.getProperty("consumerGroup") + "-" + consumerProperties.getProperty("topic"));
props.put(ConsumerConfig.CLIENT_ID_CONFIG,
consumerProperties.getProperty("topic") + "-" + consumerProperties.getProperty("consumerID"));
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "latest");
props.put(ConsumerConfig.ALLOW_AUTO_CREATE_TOPICS_CONFIG, false);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, DESERIALIZER_CLASS);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, DESERIALIZER_CLASS);
consumer = new KafkaConsumer<>(props);
pollTimeout = Integer.parseInt(consumerProperties.getProperty("timeout"));
}
/**
*
* @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.ofMillis(pollTimeout));
for (ConsumerRecord<String, String> rec : records) {
msgs.add(rec.value());
}
return msgs;
}
public String getTopicName() {
return topicName;
}
}
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