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

   1 /*
   2  * Copyright 2017 - 2021 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 java.util.HashMap;
  19 import java.util.Iterator;
  20 import java.util.Map;
  21 import javax.annotation.PreDestroy;
  22 import javax.inject.Inject;
  23 import lombok.extern.slf4j.Slf4j;
  24 import org.jvnet.hk2.annotations.Service;
  25 import org.onap.holmes.common.utils.DbDaoUtil;
  26 import org.onap.holmes.dsa.dmaappolling.Subscriber;
  27 import org.onap.holmes.engine.db.AlarmInfoDao;
  28 import org.onap.holmes.engine.manager.DroolsEngine;
  29
  30 @Service
  31 @Slf4j
  32 public class SubscriberAction {
  33
  34     @Inject
  35     private DroolsEngine droolsEngine;
  36     @Inject
  37     private DbDaoUtil daoUtil;
  38     private HashMap<String, DMaaPAlarmPolling> pollingTasks = new HashMap<>();
  39
  40     public synchronized void addSubscriber(Subscriber subscriber) {
  41         String topic = subscriber.getTopic();
  42         if (topic != null) {
  43             if (pollingTasks.containsKey(topic)) {
  44                 removeSubscriber(subscriber);
  45             }
  46             AlarmInfoDao alarmInfoDao = daoUtil.getJdbiDaoByOnDemand(AlarmInfoDao.class);
  47             DMaaPAlarmPolling pollingTask = new DMaaPAlarmPolling(subscriber, droolsEngine, alarmInfoDao);
  48             Thread thread = new Thread(pollingTask);
  49             thread.start();
  50             pollingTasks.put(topic, pollingTask);
  51             log.info("Subscribed to topic: " + subscriber.getUrl());
  52         } else {
  53             log.info("The topic is null. Operation aborted.");
  54         }
  55     }
  56
  57     public synchronized void removeSubscriber(Subscriber subscriber) {
  58         String topic = subscriber.getTopic();
  59         if (topic != null && pollingTasks.containsKey(topic)) {
  60             pollingTasks.get(topic).stopTask();
  61             pollingTasks.remove(topic);
  62         }
  63         log.info("Topic unsubscribed: " + subscriber.getUrl());
  64     }
  65
  66     @PreDestroy
  67     public void stopPollingTasks() {
  68         Iterator iterator = pollingTasks.entrySet().iterator();
  69         while (iterator.hasNext()) {
  70             Map.Entry entry = (Map.Entry)iterator.next();
  71             String key = (String) entry.getKey();
  72             pollingTasks.get(key).stopTask();
  73         }
  74         pollingTasks.clear();
  75     }
  76 }