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.dsa.dmaappolling.Subscriber;
  27 import org.onap.holmes.engine.manager.DroolsEngine;
  28
  29 @Service
  30 @Slf4j
  31 public class SubscriberAction {
  32
  33     @Inject
  34     private DroolsEngine droolsEngine;
  35     private HashMap<String, DMaaPAlarmPolling> pollingTasks = new HashMap<>();
  36
  37     public synchronized void addSubscriber(Subscriber subscriber) {
  38         if (!pollingTasks.containsKey(subscriber.getTopic())) {
  39             DMaaPAlarmPolling pollingTask = new DMaaPAlarmPolling(subscriber, droolsEngine);
  40             Thread thread = new Thread(pollingTask);
  41             thread.start();
  42             pollingTasks.put(subscriber.getTopic(), pollingTask);
  43             log.info("Subscribe to topic: " + subscriber.getUrl());
  44         }
  45     }
  46
  47     public synchronized void removeSubscriber(Subscriber subscriber) {
  48         if (pollingTasks.containsKey(subscriber.getTopic())) {
  49             pollingTasks.get(subscriber.getTopic()).stopTask();
  50             pollingTasks.remove(subscriber.getTopic());
  51         }
  52         log.info("Topic unsubscribed: " + subscriber.getUrl());
  53     }
  54
  55     @PreDestroy
  56     public void stopPollingTasks() {
  57         Iterator iterator = pollingTasks.entrySet().iterator();
  58         while (iterator.hasNext()) {
  59             Map.Entry entry = (Map.Entry)iterator.next();
  60             String key = (String) entry.getKey();
  61             pollingTasks.get(key).stopTask();
  62         }
  63         pollingTasks.clear();
  64     }
  65 }