UniversalVesAdapter/src/main/java/org/onap/universalvesadapter/service/DMaapService.java

   1 /*
   2 * ============LICENSE_START=======================================================
   3 * ONAP : DCAE
   4 * ================================================================================
   5 * Copyright 2018 TechMahindra
   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 package org.onap.universalvesadapter.service;
  21
  22 import java.util.ArrayList;
  23 import java.util.LinkedList;
  24 import java.util.List;
  25
  26 import org.onap.universalvesadapter.adapter.UniversalEventAdapter;
  27 import org.onap.universalvesadapter.dmaap.Creator;
  28 import org.onap.universalvesadapter.dmaap.MRPublisher.DMaaPMRPublisher;
  29 import org.onap.universalvesadapter.dmaap.MRSubcriber.DMaaPMRSubscriber;
  30 import org.onap.universalvesadapter.exception.DMaapException;
  31 import org.onap.universalvesadapter.exception.VesException;
  32 import org.onap.universalvesadapter.utils.DmaapConfig;
  33 import org.slf4j.Logger;
  34 import org.slf4j.LoggerFactory;
  35 import org.springframework.beans.factory.annotation.Autowired;
  36 import org.springframework.beans.factory.annotation.Value;
  37 import org.springframework.stereotype.Component;
  38
  39 @Component
  40 public class DMaapService {
  41
  42         private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());
  43         private static List<String> list = new LinkedList<String>();
  44         @Autowired
  45         private UniversalEventAdapter eventAdapter;
  46         @Autowired
  47         private DmaapConfig dmaapConfig;
  48
  49         /**
  50          * It fetches events from DMaap in JSON, transforms JSON to VES format and
  51          * publishes it to outgoing DMaap MR Topic
  52          *
  53          * @param DMaaPMRSubscriber,DMaaPMRPublisher
  54          * @return
  55          */
  56         public void fetchAndPublishInDMaaP(DMaaPMRSubscriber dMaaPMRSubscriber, DMaaPMRPublisher publisher, Creator creater)
  57                         throws InterruptedException {
  58                 LOGGER.info("fetch and publish from and to Dmaap started");
  59
  60                 int pollingInternalInt=dmaapConfig.getPollingInterval();
  61                 LOGGER.info("The Polling Interval in Milli Second is :" +pollingInternalInt);
  62                 while (true) {
  63                         synchronized (this) {
  64                                 for (String incomingJsonString : dMaaPMRSubscriber.fetchMessages().getFetchedMessages()) {
  65                                         list.add(incomingJsonString);
  66
  67                                 }
  68
  69                                 if (list.isEmpty()) {
  70                                         Thread.sleep(pollingInternalInt);
  71                                 }
  72                                 LOGGER.debug("number of messages to be converted :{}", list.size());
  73
  74                                 if (!list.isEmpty()) {
  75                                         String val = ((LinkedList<String>) list).removeFirst();
  76                                         List<String> messages = new ArrayList<>();
  77                                         String vesEvent = processReceivedJson(val);
  78                                         if (vesEvent!=null && (!(vesEvent.isEmpty() || vesEvent.equals("")))) {
  79                                                 messages.add(vesEvent);
  80                                                 publisher.publish(messages);
  81                                                 LOGGER.info("Message successfully published to DMaaP Topic");
  82                                         }
  83
  84                                 }
  85
  86                         }
  87                 }
  88         }
  89
  90         /**
  91          * It finds mapping file for received json, transforms json to VES format
  92          *
  93          * @param incomingJsonString
  94          * @return
  95          */
  96         private String processReceivedJson(String incomingJsonString) {
  97                 String outgoingJsonString = null;
  98                 if (!"".equals(incomingJsonString)) {
  99
 100                         try {
 101                                 /*
 102                                  * For Future events  String eventType =
 103                                  * adapterService.identifyEventTypeFromIncomingJson(incomingJsonString);
 104                                  *
 105                                  * LOGGER.debug("Event identified as " + eventType);
 106                                  */
 107
 108                                 outgoingJsonString = eventAdapter.transform(incomingJsonString, "snmp");
 109
 110                         } catch (VesException exception) {
 111                                 LOGGER.error("Received exception : " + exception.getMessage(), exception);
 112                                 LOGGER.error("APPLICATION WILL BE SHUTDOWN UNTIL ABOVE ISSUE IS RESOLVED.");
 113                         } catch (DMaapException e) {
 114                                 LOGGER.error("Received exception : ", e.getMessage());
 115                         }
 116                 }
 117                 return outgoingJsonString;
 118         }
 119
 120 }