+/*
+ * Copyright 2017 ZTE Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onap.holmes.engine.dmaap;
+
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import javax.annotation.PreDestroy;
+import javax.inject.Inject;
+import org.jvnet.hk2.annotations.Service;
+import org.onap.holmes.dsa.dmaappolling.Subscriber;
+import org.onap.holmes.engine.manager.DroolsEngine;
+
+@Service
+public class SubscriberAction {
+
+ @Inject
+ private DroolsEngine droolsEngine;
+ private HashMap<String, DMaaPAlarmPolling> pollingTasks = new HashMap<>();
+
+ public synchronized void addSubscriber(Subscriber subscriber) {
+ if (!pollingTasks.containsKey(subscriber.getTopic())) {
+ DMaaPAlarmPolling pollingTask = new DMaaPAlarmPolling(subscriber, droolsEngine);
+ Thread thread = new Thread(pollingTask);
+ thread.start();
+ pollingTasks.put(subscriber.getTopic(), pollingTask);
+ }
+ }
+
+ public synchronized void removeSubscriber(Subscriber subscriber) {
+ if (pollingTasks.containsKey(subscriber.getTopic())) {
+ pollingTasks.get(subscriber.getTopic()).stopTask();
+ pollingTasks.remove(subscriber.getTopic());
+ }
+ }
+
+ @PreDestroy
+ public void stopPollingTasks() {
+ Iterator iterator = pollingTasks.entrySet().iterator();
+ while (iterator.hasNext()) {
+ Map.Entry entry = (Map.Entry)iterator.next();
+ String key = (String) entry.getKey();
+ pollingTasks.get(key).stopTask();
+ }
+ pollingTasks.clear();
+ }
+}