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         String topic = subscriber.getTopic();
  39         if (topic != null && !pollingTasks.containsKey(topic)) {
  40             DMaaPAlarmPolling pollingTask = new DMaaPAlarmPolling(subscriber, droolsEngine);
  41             Thread thread = new Thread(pollingTask);
  42             thread.start();
  43             pollingTasks.put(topic, pollingTask);
  44             log.info("Subscribe to topic: " + subscriber.getUrl());
  45         }
  46     }
  47
  48     public synchronized void removeSubscriber(Subscriber subscriber) {
  49         String topic = subscriber.getTopic();
  50         if (topic != null && pollingTasks.containsKey(topic)) {
  51             pollingTasks.get(topic).stopTask();
  52             pollingTasks.remove(topic);
  53         }
  54         log.info("Topic unsubscribed: " + subscriber.getUrl());
  55     }
  56
  57     @PreDestroy
  58     public void stopPollingTasks() {
  59         Iterator iterator = pollingTasks.entrySet().iterator();
  60         while (iterator.hasNext()) {
  61             Map.Entry entry = (Map.Entry)iterator.next();
  62             String key = (String) entry.getKey();
  63             pollingTasks.get(key).stopTask();
  64         }
  65         pollingTasks.clear();
  66     }
  67 }