engine-d/src/main/java/org/onap/holmes/engine/dmaappolling/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.dmaappolling;
  17
  18 import java.util.concurrent.ConcurrentHashMap;
  19 import java.util.concurrent.Executors;
  20 import java.util.concurrent.ScheduledExecutorService;
  21 import java.util.concurrent.ScheduledFuture;
  22 import java.util.concurrent.TimeUnit;
  23 import javax.inject.Inject;
  24 import org.jvnet.hk2.annotations.Service;
  25 import org.onap.holmes.dsa.dmaappolling.Subscriber;
  26 import org.onap.holmes.engine.manager.DroolsEngine;
  27
  28 @Service
  29 public class SubscriberAction {
  30
  31     @Inject
  32     private DroolsEngine droolsEngine;
  33
  34     private ConcurrentHashMap<String, ScheduledFuture> pollingRequests = new ConcurrentHashMap<String, ScheduledFuture>();
  35     private ScheduledExecutorService service = Executors.newSingleThreadScheduledExecutor();
  36
  37     public void addSubscriber(Subscriber subscriber) {
  38         DMaaPPollingRequest pollingTask = new DMaaPPollingRequest(subscriber, droolsEngine);
  39         ScheduledFuture future = service
  40                 .scheduleAtFixedRate(pollingTask, 0, subscriber.getPeriod(), TimeUnit.MILLISECONDS);
  41         pollingRequests.put(subscriber.getTopic(), future);
  42     }
  43
  44     public void removeSubscriber(Subscriber subscriber) {
  45         ScheduledFuture future = pollingRequests.get(subscriber.getTopic());
  46         if (future != null) {
  47             future.cancel(true);
  48         }
  49         pollingRequests.remove(subscriber.getTopic());
  50     }
  51 }