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
  58     public volatile List<HashMap<String, String>> updateInfoMap;
  59
  60     @Autowired
  61     public PnfEventReadyDmaapClient(Environment env) {
  62         httpClient = HttpClientBuilder.create().build();
  63         pnfCorrelationIdToThreadMap = new ConcurrentHashMap<>();
  64         topicListenerDelayInSeconds = env.getProperty("pnf.dmaap.topicListenerDelayInSeconds", Integer.class);
  65         executor = null;
  66         getRequest = new HttpGet(UriBuilder.fromUri(env.getProperty("pnf.dmaap.uriPathPrefix"))
  67                 .scheme(env.getProperty("pnf.dmaap.protocol")).host(env.getProperty("pnf.dmaap.host"))
  68                 .port(env.getProperty("pnf.dmaap.port", Integer.class)).path(env.getProperty("pnf.dmaap.topicName"))
  69                 .path(env.getProperty("pnf.dmaap.consumerGroup")).path(env.getProperty("pnf.dmaap.consumerId"))
  70                 .build());
  71         updateInfoMap = new ArrayList<>();
  72     }
  73
  74     @Override
  75     public synchronized void registerForUpdate(String pnfCorrelationId, Runnable informConsumer,
  76             Optional<HashMap<String, String>> updateInfo) {
  77         logger.debug("registering for pnf ready dmaap event for pnf correlation id: {}", pnfCorrelationId);
  78         HashMap<String, String> map = updateInfo.get();
  79         if (map != null && map.size() > 0) {
  80             synchronized (updateInfoMap) {
  81                 updateInfoMap.add(map);
  82             }
  83         }
  84         pnfCorrelationIdToThreadMap.put(pnfCorrelationId, informConsumer);
  85         if (!dmaapThreadListenerIsRunning) {
  86             startDmaapThreadListener();
  87         }
  88     }
  89
  90     @Override
  91     public synchronized Runnable unregister(String pnfCorrelationId) {
  92         logger.debug("unregistering from pnf ready dmaap event for pnf correlation id: {}", pnfCorrelationId);
  93         Runnable runnable = pnfCorrelationIdToThreadMap.remove(pnfCorrelationId);
  94         synchronized (updateInfoMap) {
  95             for (int i = updateInfoMap.size() - 1; i >= 0; i--) {
  96                 if (!updateInfoMap.get(i).containsKey("pnfCorrelationId"))
  97                     continue;
  98                 String id = updateInfoMap.get(i).get("pnfCorrelationId");
  99                 if (id != pnfCorrelationId)
 100                     continue;
 101                 updateInfoMap.remove(i);
 102             }
 103         }
 104         if (pnfCorrelationIdToThreadMap.isEmpty()) {
 105             stopDmaapThreadListener();
 106         }
 107         return runnable;
 108     }
 109
 110     private synchronized void startDmaapThreadListener() {
 111         if (!dmaapThreadListenerIsRunning) {
 112             executor = new ScheduledThreadPoolExecutor(1);
 113             executor.setContinueExistingPeriodicTasksAfterShutdownPolicy(false);
 114             executor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
 115             executor.scheduleWithFixedDelay(new DmaapTopicListenerThread(), 0, topicListenerDelayInSeconds,
 116                     TimeUnit.SECONDS);
 117             dmaapThreadListenerIsRunning = true;
 118         }
 119     }
 120
 121     private synchronized void stopDmaapThreadListener() {
 122         if (dmaapThreadListenerIsRunning) {
 123             executor.shutdown();
 124             dmaapThreadListenerIsRunning = false;
 125             executor = null;
 126         }
 127     }
 128
 129     class DmaapTopicListenerThread implements Runnable {
 130
 131         @Override
 132         public void run() {
 133             try {
 134                 logger.debug("dmaap listener starts listening pnf ready dmaap topic");
 135                 HttpResponse response = httpClient.execute(getRequest);
 136                 List<String> idList = getPnfCorrelationIdListFromResponse(response);
 137
 138                 // idList is never null
 139                 if (!idList.isEmpty()) {
 140                     // send only body of response
 141                     registerClientResponse(idList.get(0), EntityUtils.toString(response.getEntity(), "UTF-8"));
 142                 }
 143
 144                 if (idList != null) {
 145                     idList.forEach(this::informAboutPnfReadyIfPnfCorrelationIdFound);
 146                 }
 147             } catch (IOException e) {
 148                 logger.error("Exception caught during sending rest request to dmaap for listening event topic", e);
 149             } finally {
 150                 getRequest.reset();
 151             }
 152         }
 153
 154         private List<String> getPnfCorrelationIdListFromResponse(HttpResponse response) throws IOException {
 155             if (response.getStatusLine().getStatusCode() == 200) {
 156                 String responseString = EntityUtils.toString(response.getEntity(), "UTF-8");
 157                 if (responseString != null) {
 158                     return JsonUtilForPnfCorrelationId.parseJsonToGelAllPnfCorrelationId(responseString);
 159                 }
 160             }
 161             return Collections.emptyList();
 162         }
 163
 164         private void informAboutPnfReadyIfPnfCorrelationIdFound(String pnfCorrelationId) {
 165             Runnable runnable = unregister(pnfCorrelationId);
 166             if (runnable != null) {
 167                 logger.debug("dmaap listener gets pnf ready event for pnfCorrelationId: {}", pnfCorrelationId);
 168                 runnable.run();
 169             }
 170         }
 171
 172         private void registerClientResponse(String pnfCorrelationId, String response) {
 173
 174             String customerId = null;
 175             String serviceType = null;
 176             String serId = null;
 177             synchronized (updateInfoMap) {
 178                 for (HashMap<String, String> map : updateInfoMap) {
 179                     if (!map.containsKey("pnfCorrelationId"))
 180                         continue;
 181                     if (pnfCorrelationId != map.get("pnfCorrelationId"))
 182                         continue;
 183                     if (!map.containsKey("globalSubscriberID"))
 184                         continue;
 185                     if (!map.containsKey("serviceType"))
 186                         continue;
 187                     if (!map.containsKey("serviceInstanceId"))
 188                         continue;
 189                     customerId = map.get("pnfCorrelationId");
 190                     serviceType = map.get("serviceType");
 191                     serId = map.get("serviceInstanceId");
 192                 }
 193             }
 194             if (customerId == null || serviceType == null || serId == null)
 195                 return;
 196             AAIResourcesClient client = new AAIResourcesClient();
 197             AAIResourceUri uri = AAIUriFactory.createResourceUri(AAIObjectType.SERVICE_INSTANCE_METADATA, customerId,
 198                     serviceType, serId);
 199             client.update(uri, response);
 200         }
 201
 202     }
 203 }