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

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