bpmn/so-bpmn-infrastructure-common/src/main/java/org/onap/so/bpmn/infrastructure/pnf/kafka/PnfEventReadyKafkaClient.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * ONAP - SO
   4  * ================================================================================
   5  * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
   6  * ================================================================================
   7  * Copyright (C) 2018 Nokia.
   8  * ================================================================================
   9  * Licensed under the Apache License, Version 2.0 (the "License");
  10  * you may not use this file except in compliance with the License.
  11  * You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  * ============LICENSE_END=========================================================
  21  */
  22 package org.onap.so.bpmn.infrastructure.pnf.kafka;
  23
  24 import java.io.IOException;
  25 import java.util.Collections;
  26 import java.util.List;
  27 import java.util.Map;
  28 import java.util.concurrent.ConcurrentHashMap;
  29 import java.util.concurrent.ScheduledThreadPoolExecutor;
  30 import java.util.concurrent.TimeUnit;
  31 import org.onap.so.client.kafka.KafkaConsumerImpl;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34 import org.springframework.beans.factory.annotation.Autowired;
  35 import org.springframework.core.env.Environment;
  36 import org.springframework.stereotype.Component;
  37
  38 @Component
  39 public class PnfEventReadyKafkaClient implements KafkaClient {
  40     private static final Logger logger = LoggerFactory.getLogger(PnfEventReadyKafkaClient.class);
  41     private Map<String, Runnable> pnfCorrelationIdToThreadMap;
  42     private int topicListenerDelayInSeconds;
  43     private volatile ScheduledThreadPoolExecutor executor;
  44     private volatile boolean kafkaThreadListenerIsRunning;
  45     private KafkaConsumerImpl consumerForPnfReady;
  46     private KafkaConsumerImpl consumerForPnfUpdate;
  47     private String pnfReadyTopic;
  48     private String pnfUpdateTopic;
  49     private String consumerGroup;
  50     private String consumerId;
  51     private String consumerIdUpdate;
  52
  53
  54
  55     @Autowired
  56     public PnfEventReadyKafkaClient(Environment env) throws IOException {
  57         pnfCorrelationIdToThreadMap = new ConcurrentHashMap<>();
  58         topicListenerDelayInSeconds = env.getProperty("pnf.kafka.topicListenerDelayInSeconds", Integer.class);
  59         executor = null;
  60         try {
  61             consumerForPnfReady = new KafkaConsumerImpl(env.getProperty("pnf.kafka.kafkaBootstrapServers"));
  62             consumerForPnfUpdate = new KafkaConsumerImpl(env.getProperty("pnf.kafka.kafkaBootstrapServers"));
  63         } catch (Exception e) {
  64             throw new RuntimeException(e);
  65         }
  66         pnfReadyTopic = env.getProperty("pnf.kafka.pnfReadyTopicName");
  67         pnfUpdateTopic = env.getProperty("pnf.kafka.pnfUpdateTopicName");
  68         consumerGroup = env.getProperty("pnf.kafka.consumerGroup");
  69         consumerId = env.getProperty("pnf.kafka.consumerId");
  70         consumerIdUpdate = env.getProperty("pnf.kafka.consumerIdUpdate");
  71     }
  72
  73
  74     @Override
  75     public synchronized void registerForUpdate(String pnfCorrelationId, Runnable informConsumer) {
  76         logger.debug("registering for pnf ready kafka event for pnf correlation id: {}", pnfCorrelationId);
  77         pnfCorrelationIdToThreadMap.put(pnfCorrelationId, informConsumer);
  78         if (!kafkaThreadListenerIsRunning) {
  79             startKafkaThreadListener();
  80         }
  81     }
  82
  83     @Override
  84     public synchronized Runnable unregister(String pnfCorrelationId) {
  85         logger.debug("unregistering from pnf ready kafka event for pnf correlation id: {}", pnfCorrelationId);
  86         Runnable runnable = pnfCorrelationIdToThreadMap.remove(pnfCorrelationId);
  87         if (pnfCorrelationIdToThreadMap.isEmpty()) {
  88             consumerForPnfUpdate.close();
  89             consumerForPnfReady.close();
  90             stopKafkaThreadListener();
  91         }
  92         return runnable;
  93     }
  94
  95     private synchronized void startKafkaThreadListener() {
  96         if (!kafkaThreadListenerIsRunning) {
  97             executor = new ScheduledThreadPoolExecutor(1);
  98             executor.setContinueExistingPeriodicTasksAfterShutdownPolicy(false);
  99             executor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
 100             executor.scheduleWithFixedDelay(new KafkaTopicListenerThread(), 0, topicListenerDelayInSeconds,
 101                     TimeUnit.SECONDS);
 102             kafkaThreadListenerIsRunning = true;
 103         }
 104     }
 105
 106     private synchronized void stopKafkaThreadListener() {
 107         if (kafkaThreadListenerIsRunning) {
 108             executor.shutdown();
 109             kafkaThreadListenerIsRunning = false;
 110             executor = null;
 111         }
 112     }
 113
 114     class KafkaTopicListenerThread implements Runnable {
 115         @Override
 116         public void run() {
 117             try {
 118                 List<String> response;
 119                 System.out.println(pnfUpdateTopic + "   " + consumerGroup);
 120                 response = consumerForPnfUpdate.get(pnfUpdateTopic, consumerGroup, consumerIdUpdate);
 121                 if (response.isEmpty()) {
 122                     response = consumerForPnfReady.get(pnfReadyTopic, consumerGroup, consumerId);
 123                     getPnfCorrelationIdListFromResponse(response)
 124                             .forEach(this::informAboutPnfReadyIfPnfCorrelationIdFound);
 125                 } else {
 126                     getPnfCorrelationIdListFromResponse(response)
 127                             .forEach(this::informAboutPnfReadyIfPnfCorrelationIdFound);
 128                 }
 129             } catch (IOException e) {
 130                 logger.error("Exception caught during sending rest request to kafka for listening event topic", e);
 131             }
 132         }
 133
 134         private List<String> getPnfCorrelationIdListFromResponse(List<String> response) throws IOException {
 135             if (response != null) {
 136                 return JsonUtilForPnfCorrelationId.parseJsonToGelAllPnfCorrelationId(response);
 137             }
 138             return Collections.emptyList();
 139         }
 140
 141         private void informAboutPnfReadyIfPnfCorrelationIdFound(String pnfCorrelationId) {
 142             Runnable runnable = unregister(pnfCorrelationId);
 143             if (runnable != null) {
 144                 logger.debug("kafka listener gets pnf ready event for pnfCorrelationId: {}", pnfCorrelationId);
 145                 runnable.run();
 146             }
 147         }
 148     }
 149 }
 150