bpmn/so-bpmn-infrastructure-common/src/main/java/org/onap/so/bpmn/infrastructure/pnf/dmaap/PnfEventReadyDmaapClient.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * ONAP - SO
   4  * ================================================================================
   5  * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
   6  * ================================================================================
   7  * Copyright (C) 2018 Nokia.
   8  * ================================================================================
   9  * Licensed under the Apache License, Version 2.0 (the "License");
  10  * you may not use this file except in compliance with the License.
  11  * You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  * ============LICENSE_END=========================================================
  21  */
  22
  23 package org.onap.so.bpmn.infrastructure.pnf.dmaap;
  24
  25 import java.io.IOException;
  26 import java.util.*;
  27 import java.util.concurrent.ConcurrentHashMap;
  28 import java.util.concurrent.ScheduledThreadPoolExecutor;
  29 import java.util.concurrent.TimeUnit;
  30 import javax.ws.rs.core.UriBuilder;
  31 import org.apache.http.HttpResponse;
  32 import org.apache.http.client.HttpClient;
  33 import org.apache.http.client.methods.HttpGet;
  34 import org.apache.http.impl.client.HttpClientBuilder;
  35 import org.apache.http.util.EntityUtils;
  36 import org.slf4j.Logger;
  37 import org.slf4j.LoggerFactory;
  38 import org.springframework.beans.factory.annotation.Autowired;
  39 import org.springframework.core.env.Environment;
  40 import org.springframework.stereotype.Component;
  41 import org.onap.so.client.aai.entities.uri.AAIResourceUri;
  42 import org.onap.so.client.aai.entities.uri.AAIUriFactory;
  43 import org.onap.so.client.aai.AAIResourcesClient;
  44 import org.onap.so.client.aai.AAIObjectType;
  45
  46 @Component
  47 public class PnfEventReadyDmaapClient implements DmaapClient {
  48
  49     private static final Logger logger = LoggerFactory.getLogger(PnfEventReadyDmaapClient.class);
  50
  51     private HttpClient httpClient;
  52     private Map<String, Runnable> pnfCorrelationIdToThreadMap;
  53     private HttpGet getRequest;
  54     private int topicListenerDelayInSeconds;
  55     private volatile ScheduledThreadPoolExecutor executor;
  56     private volatile boolean dmaapThreadListenerIsRunning;
  57     private volatile List<Map<String, String>> listOfUpdateInfoMap;
  58
  59     @Autowired
  60     public PnfEventReadyDmaapClient(Environment env) {
  61         httpClient = HttpClientBuilder.create().build();
  62         pnfCorrelationIdToThreadMap = new ConcurrentHashMap<>();
  63         topicListenerDelayInSeconds = env.getProperty("pnf.dmaap.topicListenerDelayInSeconds", Integer.class);
  64         executor = null;
  65         getRequest = new HttpGet(UriBuilder.fromUri(env.getProperty("pnf.dmaap.uriPathPrefix"))
  66                 .scheme(env.getProperty("pnf.dmaap.protocol")).host(env.getProperty("pnf.dmaap.host"))
  67                 .port(env.getProperty("pnf.dmaap.port", Integer.class)).path(env.getProperty("pnf.dmaap.topicName"))
  68                 .path(env.getProperty("pnf.dmaap.consumerGroup")).path(env.getProperty("pnf.dmaap.consumerId"))
  69                 .build());
  70         listOfUpdateInfoMap = new ArrayList<>();
  71     }
  72
  73     @Override
  74     public synchronized void registerForUpdate(String pnfCorrelationId, Runnable informConsumer,
  75             Map<String, String> updateInfo) {
  76         logger.debug("registering for pnf ready dmaap event for pnf correlation id: {}", pnfCorrelationId);
  77         synchronized (listOfUpdateInfoMap) {
  78             listOfUpdateInfoMap.add(updateInfo);
  79         }
  80         pnfCorrelationIdToThreadMap.put(pnfCorrelationId, informConsumer);
  81         if (!dmaapThreadListenerIsRunning) {
  82             startDmaapThreadListener();
  83         }
  84     }
  85
  86     @Override
  87     public synchronized Runnable unregister(String pnfCorrelationId) {
  88         logger.debug("unregistering from pnf ready dmaap event for pnf correlation id: {}", pnfCorrelationId);
  89         Runnable runnable = pnfCorrelationIdToThreadMap.remove(pnfCorrelationId);
  90         synchronized (listOfUpdateInfoMap) {
  91             for (int i = listOfUpdateInfoMap.size() - 1; i >= 0; i--) {
  92                 if (!listOfUpdateInfoMap.get(i).containsKey("pnfCorrelationId"))
  93                     continue;
  94                 String id = listOfUpdateInfoMap.get(i).get("pnfCorrelationId");
  95                 if (id != pnfCorrelationId)
  96                     continue;
  97                 listOfUpdateInfoMap.remove(i);
  98             }
  99         }
 100         if (pnfCorrelationIdToThreadMap.isEmpty()) {
 101             stopDmaapThreadListener();
 102         }
 103         return runnable;
 104     }
 105
 106     private synchronized void startDmaapThreadListener() {
 107         if (!dmaapThreadListenerIsRunning) {
 108             executor = new ScheduledThreadPoolExecutor(1);
 109             executor.setContinueExistingPeriodicTasksAfterShutdownPolicy(false);
 110             executor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
 111             executor.scheduleWithFixedDelay(new DmaapTopicListenerThread(), 0, topicListenerDelayInSeconds,
 112                     TimeUnit.SECONDS);
 113             dmaapThreadListenerIsRunning = true;
 114         }
 115     }
 116
 117     private synchronized void stopDmaapThreadListener() {
 118         if (dmaapThreadListenerIsRunning) {
 119             executor.shutdown();
 120             dmaapThreadListenerIsRunning = false;
 121             executor = null;
 122         }
 123     }
 124
 125     class DmaapTopicListenerThread implements Runnable {
 126
 127         @Override
 128         public void run() {
 129             try {
 130                 logger.debug("dmaap listener starts listening pnf ready dmaap topic");
 131                 HttpResponse response = httpClient.execute(getRequest);
 132                 List<String> idList = getPnfCorrelationIdListFromResponse(response);
 133
 134                 // idList is never null
 135                 if (!idList.isEmpty()) {
 136                     // send only body of response
 137                     registerClientResponse(idList.get(0), EntityUtils.toString(response.getEntity(), "UTF-8"));
 138                 }
 139
 140                 if (idList != null) {
 141                     idList.forEach(this::informAboutPnfReadyIfPnfCorrelationIdFound);
 142                 }
 143             } catch (IOException e) {
 144                 logger.error("Exception caught during sending rest request to dmaap for listening event topic", e);
 145             } finally {
 146                 getRequest.reset();
 147             }
 148         }
 149
 150         private List<String> getPnfCorrelationIdListFromResponse(HttpResponse response) throws IOException {
 151             if (response.getStatusLine().getStatusCode() == 200) {
 152                 String responseString = EntityUtils.toString(response.getEntity(), "UTF-8");
 153                 if (responseString != null) {
 154                     return JsonUtilForPnfCorrelationId.parseJsonToGelAllPnfCorrelationId(responseString);
 155                 }
 156             }
 157             return Collections.emptyList();
 158         }
 159
 160         private void informAboutPnfReadyIfPnfCorrelationIdFound(String pnfCorrelationId) {
 161             Runnable runnable = unregister(pnfCorrelationId);
 162             if (runnable != null) {
 163                 logger.debug("dmaap listener gets pnf ready event for pnfCorrelationId: {}", pnfCorrelationId);
 164                 runnable.run();
 165             }
 166         }
 167
 168         private void registerClientResponse(String pnfCorrelationId, String response) {
 169
 170             String customerId = null;
 171             String serviceType = null;
 172             String serId = null;
 173             synchronized (listOfUpdateInfoMap) {
 174                 for (Map<String, String> map : listOfUpdateInfoMap) {
 175                     if (!map.containsKey("pnfCorrelationId"))
 176                         continue;
 177                     if (pnfCorrelationId != map.get("pnfCorrelationId"))
 178                         continue;
 179                     if (!map.containsKey("globalSubscriberID"))
 180                         continue;
 181                     if (!map.containsKey("serviceType"))
 182                         continue;
 183                     if (!map.containsKey("serviceInstanceId"))
 184                         continue;
 185                     customerId = map.get("pnfCorrelationId");
 186                     serviceType = map.get("serviceType");
 187                     serId = map.get("serviceInstanceId");
 188                 }
 189             }
 190             if (customerId == null || serviceType == null || serId == null)
 191                 return;
 192             AAIResourcesClient client = new AAIResourcesClient();
 193             AAIResourceUri uri = AAIUriFactory.createResourceUri(AAIObjectType.SERVICE_INSTANCE_METADATA, customerId,
 194                     serviceType, serId);
 195             client.update(uri, response);
 196         }
 197
 198     }
 199 }