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 import java.time.Duration;
  26 import java.util.Arrays;
  27 import java.util.Properties;
  28 import org.apache.kafka.clients.consumer.ConsumerRecord;
  29 import org.apache.kafka.clients.consumer.ConsumerRecords;
  30 import org.apache.kafka.clients.consumer.KafkaConsumer;
  31 import org.apache.kafka.common.serialization.StringDeserializer;
  32 import org.onap.policy.apex.core.infrastructure.messaging.MessagingException;
  33 import org.onap.policy.apex.core.infrastructure.threading.ThreadUtilities;
  34 import org.slf4j.Logger;
  35 import org.slf4j.LoggerFactory;
  36
  37 /**
  38  * The Class KafkaEventSubscriber.
  39  *
  40  * @author Liam Fallon (liam.fallon@ericsson.com)
  41  */
  42 public class KafkaEventSubscriber implements Runnable {
  43     // Get a reference to the logger
  44     private static final Logger LOGGER = LoggerFactory.getLogger(KafkaEventSubscriber.class);
  45
  46     private static final Duration POLL_DURATION = Duration.ofMillis(100);
  47
  48     private final String topic;
  49     private long eventsReceivedCount = 0;
  50
  51     KafkaConsumer<String, String> consumer;
  52
  53     private final Thread subscriberThread;
  54
  55     /**
  56      * Instantiates a new kafka event subscriber.
  57      *
  58      * @param topic the topic
  59      * @param sharedKafkaTestResource the kafka server address
  60      * @throws MessagingException the messaging exception
  61      */
  62     public KafkaEventSubscriber(final String topic,
  63         final SharedKafkaTestResource sharedKafkaTestResource) throws MessagingException {
  64         this.topic = topic;
  65
  66         final Properties consumerProperties = new Properties();
  67         consumerProperties.put("group.id", "test");
  68
  69         consumer = sharedKafkaTestResource.getKafkaTestUtils().getKafkaConsumer(StringDeserializer.class,
  70             StringDeserializer.class, consumerProperties);
  71         consumer.subscribe(Arrays.asList(topic));
  72
  73         subscriberThread = new Thread(this);
  74         subscriberThread.start();
  75     }
  76
  77     /**
  78      * {@inheritDoc}.
  79      */
  80     @Override
  81     public void run() {
  82         LOGGER.debug("{}: receiving events from Kafka server  on topic {}", KafkaEventSubscriber.class.getName(),
  83             topic);
  84
  85         while (subscriberThread.isAlive() && !subscriberThread.isInterrupted()) {
  86             try {
  87                 final ConsumerRecords<String, String> records = consumer.poll(POLL_DURATION);
  88                 for (final ConsumerRecord<String, String> record : records) {
  89                     eventsReceivedCount++;
  90                     LOGGER.debug("****** Received event No. {} ******\noffset={}\nkey={}\n{}", eventsReceivedCount,
  91                         record.offset(), record.key(), record.value());
  92                 }
  93             } catch (final Exception e) {
  94                 // Thread interrupted
  95                 break;
  96             }
  97         }
  98
  99         LOGGER.debug("{}: event reception completed", KafkaEventSubscriber.class.getName());
 100     }
 101
 102     /**
 103      * Gets the events received count.
 104      *
 105      * @return the events received count
 106      */
 107     public long getEventsReceivedCount() {
 108         return eventsReceivedCount;
 109     }
 110
 111     /**
 112      * Shutdown.
 113      */
 114     public void shutdown() {
 115         subscriberThread.interrupt();
 116
 117         while (subscriberThread.isAlive()) {
 118             ThreadUtilities.sleep(10);
 119         }
 120
 121         consumer.close();
 122         LOGGER.debug("{} : stopped", KafkaEventSubscriber.class.getName());
 123     }
 124
 125     public boolean isAlive() {
 126         return subscriberThread.isAlive();
 127     }
 128 }