1 files changed, 81 insertions, 0 deletions
diff --git a/sdnr/wt/mountpoint-registrar/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/mountpointregistrar/kafka/VESMsgKafkaConsumer.java b/sdnr/wt/mountpoint-registrar/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/mountpointregistrar/kafka/VESMsgKafkaConsumer.java
new file mode 100644
index 000000000..b8dee44b0
--- /dev/null
+++ b/sdnr/wt/mountpoint-registrar/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/mountpointregistrar/kafka/VESMsgKafkaConsumer.java
@@ -0,0 +1,81 @@
+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("topic") + "-" + consumerProperties.getProperty("consumerGroup"));
+        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.ofSeconds(pollTimeout));
+        for (ConsumerRecord<String, String> rec : records) {
+            msgs.add(rec.value());
+        }
+        return msgs;
+    }
+
+    public String getTopicName() {
+        return topicName;
+    }
+}