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 package org.onap.so.bpmn.infrastructure.pnf.dmaap;
  23
  24 import java.io.IOException;
  25 import java.util.Collections;
  26 import java.util.List;
  27 import java.util.Map;
  28 import java.util.concurrent.ConcurrentHashMap;
  29 import java.util.concurrent.ScheduledThreadPoolExecutor;
  30 import java.util.concurrent.TimeUnit;
  31 import javax.ws.rs.core.UriBuilder;
  32 import org.apache.http.HttpResponse;
  33 import org.apache.http.client.HttpClient;
  34 import org.apache.http.client.methods.HttpGet;
  35 import org.apache.http.impl.client.HttpClientBuilder;
  36 import org.apache.http.util.EntityUtils;
  37 import org.slf4j.Logger;
  38 import org.slf4j.LoggerFactory;
  39 import org.springframework.beans.factory.annotation.Autowired;
  40 import org.springframework.core.env.Environment;
  41 import org.springframework.stereotype.Component;
  42
  43 @Component
  44 public class PnfEventReadyDmaapClient implements DmaapClient {
  45     private static final Logger logger = LoggerFactory.getLogger(PnfEventReadyDmaapClient.class);
  46     private HttpClient httpClient;
  47     private Map<String, Runnable> pnfCorrelationIdToThreadMap;
  48     private HttpGet getRequestForpnfReady;
  49     private HttpGet getRequestForPnfUpdate;
  50     private int topicListenerDelayInSeconds;
  51     private volatile ScheduledThreadPoolExecutor executor;
  52     private volatile boolean dmaapThreadListenerIsRunning;
  53     private String topicName;
  54
  55     @Autowired
  56     public PnfEventReadyDmaapClient(Environment env) {
  57         httpClient = HttpClientBuilder.create().build();
  58         pnfCorrelationIdToThreadMap = new ConcurrentHashMap<>();
  59         topicListenerDelayInSeconds = env.getProperty("pnf.dmaap.topicListenerDelayInSeconds", Integer.class);
  60         executor = null;
  61         topicName = env.getProperty("pnf.dmaap.topicName");
  62         String[] topic = topicName.split("\\s");
  63         String pnf_ready = null;
  64         String pnf_update = null;
  65         for (String t : topic) {
  66             if (t.matches("(.*)PNF_READY(.*)")) {
  67                 pnf_ready = t;
  68             } else if (t.matches("(.*)PNF_UPDATE(.*)")) {
  69                 pnf_update = t;
  70             } else {
  71                 return;
  72             }
  73         }
  74         getRequestForpnfReady = new HttpGet(UriBuilder.fromUri(env.getProperty("pnf.dmaap.uriPathPrefix"))
  75                 .scheme(env.getProperty("pnf.dmaap.protocol")).host(env.getProperty("pnf.dmaap.host"))
  76                 .port(env.getProperty("pnf.dmaap.port", Integer.class)).path(pnf_ready)
  77                 .path(env.getProperty("pnf.dmaap.consumerGroup")).path(env.getProperty("pnf.dmaap.consumerId"))
  78                 .build());
  79         getRequestForPnfUpdate = new HttpGet(UriBuilder.fromUri(env.getProperty("pnf.dmaap.uriPathPrefix"))
  80                 .scheme(env.getProperty("pnf.dmaap.protocol")).host(env.getProperty("pnf.dmaap.host"))
  81                 .port(env.getProperty("pnf.dmaap.port", Integer.class)).path(pnf_update)
  82                 .path(env.getProperty("pnf.dmaap.consumerGroup")).path(env.getProperty("pnf.dmaap.consumerId"))
  83                 .build());
  84     }
  85
  86     @Override
  87     public synchronized void registerForUpdate(String pnfCorrelationId, Runnable informConsumer) {
  88         logger.debug("registering for pnf ready dmaap event for pnf correlation id: {}", pnfCorrelationId);
  89         pnfCorrelationIdToThreadMap.put(pnfCorrelationId, informConsumer);
  90         if (!dmaapThreadListenerIsRunning) {
  91             startDmaapThreadListener();
  92         }
  93     }
  94
  95     @Override
  96     public synchronized Runnable unregister(String pnfCorrelationId) {
  97         logger.debug("unregistering from pnf ready dmaap event for pnf correlation id: {}", pnfCorrelationId);
  98         Runnable runnable = pnfCorrelationIdToThreadMap.remove(pnfCorrelationId);
  99         if (pnfCorrelationIdToThreadMap.isEmpty()) {
 100             stopDmaapThreadListener();
 101         }
 102         return runnable;
 103     }
 104
 105     private synchronized void startDmaapThreadListener() {
 106         if (!dmaapThreadListenerIsRunning) {
 107             executor = new ScheduledThreadPoolExecutor(1);
 108             executor.setContinueExistingPeriodicTasksAfterShutdownPolicy(false);
 109             executor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
 110             executor.scheduleWithFixedDelay(new DmaapTopicListenerThread(), 0, topicListenerDelayInSeconds,
 111                     TimeUnit.SECONDS);
 112             dmaapThreadListenerIsRunning = true;
 113         }
 114     }
 115
 116     private synchronized void stopDmaapThreadListener() {
 117         if (dmaapThreadListenerIsRunning) {
 118             executor.shutdown();
 119             dmaapThreadListenerIsRunning = false;
 120             executor = null;
 121         }
 122     }
 123
 124     class DmaapTopicListenerThread implements Runnable {
 125         @Override
 126         public void run() {
 127             try {
 128                 HttpResponse response;
 129                 response = httpClient.execute(getRequestForPnfUpdate);
 130                 List<String> pnfUpdateResponse = getPnfCorrelationIdListFromResponse(response);
 131                 if (pnfUpdateResponse.isEmpty()) {
 132                     response = httpClient.execute(getRequestForpnfReady);
 133                     getPnfCorrelationIdListFromResponse(response)
 134                             .forEach(this::informAboutPnfReadyIfPnfCorrelationIdFound);
 135                 } else {
 136                     pnfUpdateResponse.forEach(this::informAboutPnfReadyIfPnfCorrelationIdFound);
 137                 }
 138             } catch (IOException e) {
 139                 logger.error("Exception caught during sending rest request to dmaap for listening event topic", e);
 140             } finally {
 141                 getRequestForpnfReady.reset();
 142                 getRequestForPnfUpdate.reset();
 143             }
 144         }
 145
 146         private List<String> getPnfCorrelationIdListFromResponse(HttpResponse response) throws IOException {
 147             if (response.getStatusLine().getStatusCode() == 200) {
 148                 String responseString = EntityUtils.toString(response.getEntity(), "UTF-8");
 149                 if (responseString != null) {
 150                     return JsonUtilForPnfCorrelationId.parseJsonToGelAllPnfCorrelationId(responseString);
 151                 }
 152             }
 153             return Collections.emptyList();
 154         }
 155
 156         private void informAboutPnfReadyIfPnfCorrelationIdFound(String pnfCorrelationId) {
 157             Runnable runnable = unregister(pnfCorrelationId);
 158             if (runnable != null) {
 159                 logger.debug("dmaap listener gets pnf ready event for pnfCorrelationId: {}", pnfCorrelationId);
 160                 runnable.run();
 161             }
 162         }
 163     }
 164 }