nbinotifications/src/main/java/org/opendaylight/transportpce/nbinotifications/consumer/Subscriber.java

   1 /*
   2  * Copyright © 2020 Orange, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.transportpce.nbinotifications.consumer;
   9
  10 import com.google.common.annotations.VisibleForTesting;
  11 import java.time.Duration;
  12 import java.util.ArrayList;
  13 import java.util.Collections;
  14 import java.util.List;
  15 import java.util.Properties;
  16 import org.apache.kafka.clients.consumer.Consumer;
  17 import org.apache.kafka.clients.consumer.ConsumerConfig;
  18 import org.apache.kafka.clients.consumer.ConsumerRecord;
  19 import org.apache.kafka.clients.consumer.ConsumerRecords;
  20 import org.apache.kafka.clients.consumer.KafkaConsumer;
  21 import org.apache.kafka.common.serialization.StringDeserializer;
  22 import org.eclipse.jdt.annotation.NonNull;
  23 import org.opendaylight.transportpce.common.converter.JsonStringConverter;
  24 import org.opendaylight.transportpce.nbinotifications.serialization.ConfigConstants;
  25 import org.opendaylight.transportpce.nbinotifications.utils.NbiNotificationsUtils;
  26 import org.opendaylight.yangtools.yang.binding.DataObject;
  27 import org.opendaylight.yangtools.yang.common.QName;
  28 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  29 import org.slf4j.Logger;
  30 import org.slf4j.LoggerFactory;
  31
  32 public class Subscriber<T extends DataObject, D> {
  33     private static final Logger LOG = LoggerFactory.getLogger(Subscriber.class);
  34
  35     private final Consumer<String, D> consumer;
  36
  37     public Subscriber(String id, String groupId, String subscriberServer, JsonStringConverter<T> deserializer,
  38                       Class<?> deserializerConf) {
  39         Properties propsConsumer = NbiNotificationsUtils.loadProperties("subscriber.properties");
  40         propsConsumer.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
  41         propsConsumer.put(ConsumerConfig.CLIENT_ID_CONFIG, id);
  42         propsConsumer.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
  43         propsConsumer.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG , deserializerConf);
  44         propsConsumer.put(ConfigConstants.CONVERTER , deserializer);
  45         if (subscriberServer != null && !subscriberServer.isBlank()) {
  46             propsConsumer.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, subscriberServer);
  47         }
  48         LOG.info("Subscribing for group id {}, client config id {} with properties {}", groupId, id, propsConsumer);
  49         consumer = new KafkaConsumer<>(propsConsumer);
  50     }
  51
  52     public List<D> subscribe(String topicName, @NonNull QName name) {
  53         LOG.info("Subscribe request to topic '{}' ", topicName);
  54         consumer.subscribe(Collections.singleton(topicName));
  55         final ConsumerRecords<String, D> consumerRecords = consumer.poll(Duration.ofMillis(1000));
  56         List<D> notificationServiceList = new ArrayList<>();
  57         YangInstanceIdentifier.of(name);
  58         for (ConsumerRecord<String, D> record : consumerRecords) {
  59             if (record.value() != null) {
  60                 notificationServiceList.add(record.value());
  61             }
  62         }
  63         LOG.info("Getting records '{}' ", notificationServiceList);
  64         consumer.unsubscribe();
  65         consumer.close();
  66         return notificationServiceList;
  67     }
  68
  69     @VisibleForTesting public Subscriber(Consumer<String, D> consumer) {
  70         this.consumer = consumer;
  71     }
  72 }