gerrit.onap Code Review - policy/apex-pdp.git/blob

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