testsuites/integration/integration-uservice-test/src/test/java/org/onap/policy/apex/testsuites/integration/uservice/adapt/kafka/KafkaEventSubscriber.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
   4  *  Modifications Copyright (C) 2019-2020 Nordix Foundation.
   5  * ================================================================================
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *      http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  * SPDX-License-Identifier: Apache-2.0
  19  * ============LICENSE_END=========================================================
  20  */
  21
  22 package org.onap.policy.apex.testsuites.integration.uservice.adapt.kafka;
  23
  24 import com.salesforce.kafka.test.junit4.SharedKafkaTestResource;
  25
  26 import java.time.Duration;
  27 import java.util.Arrays;
  28 import java.util.Properties;
  29
  30 import org.apache.kafka.clients.consumer.ConsumerRecord;
  31 import org.apache.kafka.clients.consumer.ConsumerRecords;
  32 import org.apache.kafka.clients.consumer.KafkaConsumer;
  33 import org.apache.kafka.common.serialization.StringDeserializer;
  34 import org.onap.policy.apex.core.infrastructure.messaging.MessagingException;
  35 import org.onap.policy.apex.core.infrastructure.threading.ThreadUtilities;
  36 import org.slf4j.Logger;
  37 import org.slf4j.LoggerFactory;
  38
  39 /**
  40  * The Class KafkaEventSubscriber.
  41  *
  42  * @author Liam Fallon (liam.fallon@ericsson.com)
  43  */
  44 public class KafkaEventSubscriber implements Runnable {
  45     // Get a reference to the logger
  46     private static final Logger LOGGER = LoggerFactory.getLogger(KafkaEventSubscriber.class);
  47
  48     private static final Duration POLL_DURATION = Duration.ofMillis(100);
  49
  50     private final String topic;
  51     private long eventsReceivedCount = 0;
  52
  53     KafkaConsumer<String, String> consumer;
  54
  55     private final Thread subscriberThread;
  56
  57     /**
  58      * Instantiates a new kafka event subscriber.
  59      *
  60      * @param topic the topic
  61      * @param sharedKafkaTestResource the kafka server address
  62      * @throws MessagingException the messaging exception
  63      */
  64     public KafkaEventSubscriber(final String topic,
  65         final SharedKafkaTestResource sharedKafkaTestResource) throws MessagingException {
  66         this.topic = topic;
  67
  68         final Properties consumerProperties = new Properties();
  69         consumerProperties.put("group.id", "test");
  70
  71         consumer = sharedKafkaTestResource.getKafkaTestUtils().getKafkaConsumer(StringDeserializer.class,
  72             StringDeserializer.class, consumerProperties);
  73         consumer.subscribe(Arrays.asList(topic));
  74
  75         subscriberThread = new Thread(this);
  76         subscriberThread.start();
  77     }
  78
  79     /**
  80      * {@inheritDoc}.
  81      */
  82     @Override
  83     public void run() {
  84         LOGGER.debug("{}: receiving events from Kafka server  on topic {}", KafkaEventSubscriber.class.getName(),
  85             topic);
  86
  87         while (subscriberThread.isAlive() && !subscriberThread.isInterrupted()) {
  88             try {
  89                 final ConsumerRecords<String, String> records = consumer.poll(POLL_DURATION);
  90                 for (final ConsumerRecord<String, String> record : records) {
  91                     eventsReceivedCount++;
  92                     LOGGER.debug("****** Received event No. {} ******\noffset={}\nkey={}\n{}", eventsReceivedCount,
  93                         record.offset(), record.key(), record.value());
  94                 }
  95             } catch (final Exception e) {
  96                 // Thread interrupted
  97                 break;
  98             }
  99         }
 100
 101         LOGGER.debug("{}: event reception completed", KafkaEventSubscriber.class.getName());
 102     }
 103
 104     /**
 105      * Gets the events received count.
 106      *
 107      * @return the events received count
 108      */
 109     public long getEventsReceivedCount() {
 110         return eventsReceivedCount;
 111     }
 112
 113     /**
 114      * Shutdown.
 115      */
 116     public void shutdown() {
 117         subscriberThread.interrupt();
 118
 119         while (subscriberThread.isAlive()) {
 120             ThreadUtilities.sleep(10);
 121         }
 122
 123         consumer.close();
 124         LOGGER.debug("{} : stopped", KafkaEventSubscriber.class.getName());
 125     }
 126
 127     public boolean isAlive() {
 128         return subscriberThread.isAlive();
 129     }
 130 }