engine-d/src/main/java/org/onap/holmes/engine/dmaap/SubscriberAction.java

   1 /*
   2  * Copyright 2017 - 2022 ZTE Corporation.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.onap.holmes.engine.dmaap;
  17
  18 import jakarta.annotation.PreDestroy;
  19 import lombok.extern.slf4j.Slf4j;
  20 import org.onap.holmes.common.database.DbDaoUtil;
  21 import org.onap.holmes.dsa.dmaappolling.Subscriber;
  22 import org.onap.holmes.engine.db.AlarmInfoDaoService;
  23 import org.onap.holmes.engine.db.jdbi.AlarmInfoDao;
  24 import org.onap.holmes.engine.manager.DroolsEngine;
  25 import org.springframework.beans.factory.annotation.Autowired;
  26 import org.springframework.stereotype.Component;
  27
  28 import java.util.HashMap;
  29 import java.util.Iterator;
  30 import java.util.Map;
  31
  32 @Component
  33 @Slf4j
  34 public class SubscriberAction {
  35
  36     @Autowired
  37     private DroolsEngine droolsEngine;
  38     @Autowired
  39     private DbDaoUtil daoUtil;
  40     @Autowired
  41     private AlarmInfoDaoService alarmInfoDaoService;
  42
  43     private HashMap<String, DMaaPAlarmPolling> pollingTasks = new HashMap<>();
  44
  45     public synchronized void addSubscriber(Subscriber subscriber) {
  46         String topic = subscriber.getTopic();
  47         if (topic != null) {
  48             if (pollingTasks.containsKey(topic)) {
  49                 removeSubscriber(subscriber);
  50             }
  51             AlarmInfoDao alarmInfoDao = daoUtil.getJdbiDaoByOnDemand(AlarmInfoDao.class);
  52             DMaaPAlarmPolling pollingTask = new DMaaPAlarmPolling(subscriber, droolsEngine, alarmInfoDaoService);
  53             Thread thread = new Thread(pollingTask);
  54             thread.start();
  55             pollingTasks.put(topic, pollingTask);
  56             log.info("Subscribed to topic: " + subscriber.getUrl());
  57         } else {
  58             log.info("The topic is null. Operation aborted.");
  59         }
  60     }
  61
  62     public synchronized void removeSubscriber(Subscriber subscriber) {
  63         String topic = subscriber.getTopic();
  64         if (topic != null && pollingTasks.containsKey(topic)) {
  65             pollingTasks.get(topic).stopTask();
  66             pollingTasks.remove(topic);
  67         }
  68         log.info("Topic unsubscribed: " + subscriber.getUrl());
  69     }
  70
  71     @PreDestroy
  72     public void stopPollingTasks() {
  73         Iterator iterator = pollingTasks.entrySet().iterator();
  74         while (iterator.hasNext()) {
  75             Map.Entry entry = (Map.Entry) iterator.next();
  76             String key = (String) entry.getKey();
  77             pollingTasks.get(key).stopTask();
  78         }
  79         pollingTasks.clear();
  80     }
  81 }