openecomp-be/lib/openecomp-sdc-notification-lib/openecomp-sdc-notification-worker/src/main/java/org/openecomp/sdc/notification/workers/NotificationWorker.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * SDC
   4  * ================================================================================
   5  * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
   6  * ================================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=========================================================
  19  */
  20
  21 package org.openecomp.sdc.notification.workers;
  22
  23 import org.apache.commons.collections4.CollectionUtils;
  24 import org.openecomp.sdc.logging.api.Logger;
  25 import org.openecomp.sdc.logging.api.LoggerFactory;
  26 import org.openecomp.sdc.notification.config.ConfigurationManager;
  27 import org.openecomp.sdc.notification.types.NotificationsStatusDto;
  28
  29 import java.util.HashMap;
  30 import java.util.Map;
  31 import java.util.Objects;
  32 import java.util.UUID;
  33 import java.util.concurrent.ConcurrentHashMap;
  34 import java.util.function.Consumer;
  35
  36 public class NotificationWorker {
  37
  38         private static final int DEFAULT_POLLING_INTERVAL = 2000;
  39         private static final String POLLING_INTERVAL = "pollingIntervalMsec";
  40         private static final int DEFAULT_SELECTION_LIMIT = 10;
  41         private static final String SELECTION_SIZE = "selectionSize";
  42
  43         private static boolean stopRunning = false;
  44
  45         private int selectionLimit = DEFAULT_SELECTION_LIMIT;
  46         private int pollingSleepInterval = DEFAULT_POLLING_INTERVAL;
  47
  48         private static final Logger LOGGER = LoggerFactory.getLogger(NotificationWorker.class);
  49
  50         private static Map<String, NotificationReceiver> activeUsers = new ConcurrentHashMap<>();
  51         private NewNotificationsReader news = null;
  52
  53         public NotificationWorker(NewNotificationsReader news) {
  54                 ConfigurationManager cm = ConfigurationManager.getInstance();
  55                 pollingSleepInterval = cm.getConfigValue(POLLING_INTERVAL, DEFAULT_POLLING_INTERVAL);
  56                 selectionLimit = cm.getConfigValue(SELECTION_SIZE, DEFAULT_SELECTION_LIMIT);
  57
  58                 Objects.requireNonNull(news, "NotificationNews object is not initialized.");
  59                 this.news = news;
  60
  61                 NotificationWorker.Poller p = new Poller();
  62                 Thread thread = new Thread(p);
  63                 thread.start();
  64         }
  65
  66         public Map<String, NotificationReceiver> getActiveUsers() {
  67                 return activeUsers;
  68         }
  69
  70         public class Poller extends Thread {
  71                 public void run() {
  72                         try {
  73                                 while (!stopRunning) {
  74                                         pollNotifications();
  75                                         Thread.sleep(pollingSleepInterval);
  76                                 }
  77                         }
  78                         catch (InterruptedException e) {
  79                                 LOGGER.error("Interrupted Exception during Notification poller launch.", e);
  80                         }
  81                 }
  82
  83                 private void pollNotifications() {
  84
  85                         Map<String, NotificationReceiver> currUsers = new HashMap<>();
  86                         currUsers.putAll(getActiveUsers());
  87
  88                         for (NotificationReceiver receiver : currUsers.values()) {
  89                                 String ownerId = receiver.getOwnerId();
  90                                 UUID eventId = receiver.getlastEventId();
  91                                 NotificationsStatusDto status = news.getNewNotifications(ownerId, eventId, selectionLimit);
  92                                 if(Objects.nonNull(status) && CollectionUtils.isNotEmpty(status.getNotifications())) {
  93                                         receiver.setLastEventId(status.getLastScanned());
  94                                         receiver.getNotesProcessor().accept(status);
  95                                 }
  96                         }
  97                 }
  98
  99         }
 100
 101         public void register(String ownerId, UUID lastDelivered, Consumer<NotificationsStatusDto> notesProcessor) {
 102                 NotificationReceiver receiver = new NotificationReceiver(ownerId, lastDelivered, notesProcessor);
 103                 activeUsers.put(ownerId, receiver);
 104                 LOGGER.debug("User {} is registered with eventId: {}", ownerId, receiver.getlastEventId());
 105         }
 106
 107         public void unregister(String ownerId) {
 108                 activeUsers.remove(ownerId);
 109                 LOGGER.debug("User {} is unregistered.", ownerId);
 110         }
 111
 112         public void stopPolling() {
 113                 LOGGER.debug("Stop notification polling.");
 114                 stopRunning = true;
 115         }
 116
 117 }