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.Collections;
  27 import java.util.List;
  28 import java.util.Map;
  29 import java.util.concurrent.ConcurrentHashMap;
  30 import java.util.concurrent.ScheduledThreadPoolExecutor;
  31 import java.util.concurrent.TimeUnit;
  32 import javax.ws.rs.core.UriBuilder;
  33 import org.apache.http.HttpResponse;
  34 import org.apache.http.client.HttpClient;
  35 import org.apache.http.client.methods.HttpGet;
  36 import org.apache.http.impl.client.HttpClientBuilder;
  37 import org.apache.http.util.EntityUtils;
  38 import org.onap.so.bpmn.infrastructure.pnf.PnfNotificationEvent;
  39 import org.slf4j.Logger;
  40 import org.slf4j.LoggerFactory;
  41 import org.springframework.beans.factory.annotation.Autowired;
  42 import org.springframework.context.ApplicationEventPublisher;
  43 import org.springframework.core.env.Environment;
  44 import org.springframework.stereotype.Component;
  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     private ApplicationEventPublisher applicationEventPublisher;
  59
  60     @Autowired
  61     public PnfEventReadyDmaapClient(Environment env, ApplicationEventPublisher applicationEventPublisher) {
  62         this.applicationEventPublisher = applicationEventPublisher;
  63         httpClient = HttpClientBuilder.create().build();
  64         pnfCorrelationIdToThreadMap = new ConcurrentHashMap<>();
  65         topicListenerDelayInSeconds = env.getProperty("pnf.dmaap.topicListenerDelayInSeconds", Integer.class);
  66         executor = null;
  67         getRequest = new HttpGet(UriBuilder.fromUri(env.getProperty("pnf.dmaap.uriPathPrefix"))
  68                 .scheme(env.getProperty("pnf.dmaap.protocol")).host(env.getProperty("pnf.dmaap.host"))
  69                 .port(env.getProperty("pnf.dmaap.port", Integer.class)).path(env.getProperty("pnf.dmaap.topicName"))
  70                 .path(env.getProperty("pnf.dmaap.consumerGroup")).path(env.getProperty("pnf.dmaap.consumerId"))
  71                 .build());
  72     }
  73
  74     @Override
  75     public synchronized void registerForUpdate(String pnfCorrelationId, Runnable informConsumer) {
  76         logger.debug("registering for pnf ready dmaap event for pnf correlation id: {}", pnfCorrelationId);
  77         pnfCorrelationIdToThreadMap.put(pnfCorrelationId, informConsumer);
  78         if (!dmaapThreadListenerIsRunning) {
  79             startDmaapThreadListener();
  80         }
  81     }
  82
  83     @Override
  84     public synchronized Runnable unregister(String pnfCorrelationId) {
  85         logger.debug("unregistering from pnf ready dmaap event for pnf correlation id: {}", pnfCorrelationId);
  86         Runnable runnable = pnfCorrelationIdToThreadMap.remove(pnfCorrelationId);
  87         if (pnfCorrelationIdToThreadMap.isEmpty()) {
  88             stopDmaapThreadListener();
  89         }
  90         return runnable;
  91     }
  92
  93     private synchronized void startDmaapThreadListener() {
  94         if (!dmaapThreadListenerIsRunning) {
  95             executor = new ScheduledThreadPoolExecutor(1);
  96             executor.setContinueExistingPeriodicTasksAfterShutdownPolicy(false);
  97             executor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
  98             executor.scheduleWithFixedDelay(new DmaapTopicListenerThread(), 0, topicListenerDelayInSeconds,
  99                     TimeUnit.SECONDS);
 100             dmaapThreadListenerIsRunning = true;
 101         }
 102     }
 103
 104     private synchronized void stopDmaapThreadListener() {
 105         if (dmaapThreadListenerIsRunning) {
 106             executor.shutdown();
 107             dmaapThreadListenerIsRunning = false;
 108             executor = null;
 109         }
 110     }
 111
 112     class DmaapTopicListenerThread implements Runnable {
 113
 114         @Override
 115         public void run() {
 116             try {
 117                 logger.debug("dmaap listener starts listening pnf ready dmaap topic");
 118                 HttpResponse response = httpClient.execute(getRequest);
 119                 getPnfCorrelationIdListFromResponse(response).forEach(this::informAboutPnfReadyIfPnfCorrelationIdFound);
 120             } catch (IOException e) {
 121                 logger.error("Exception caught during sending rest request to dmaap for listening event topic", e);
 122             } finally {
 123                 getRequest.reset();
 124             }
 125         }
 126
 127         private List<String> getPnfCorrelationIdListFromResponse(HttpResponse response) throws IOException {
 128             if (response.getStatusLine().getStatusCode() == 200) {
 129                 String responseString = EntityUtils.toString(response.getEntity(), "UTF-8");
 130                 if (responseString != null) {
 131                     return JsonUtilForPnfCorrelationId.parseJsonToGelAllPnfCorrelationId(responseString);
 132                 }
 133             }
 134             return Collections.emptyList();
 135         }
 136
 137         private void informAboutPnfReadyIfPnfCorrelationIdFound(String pnfCorrelationId) {
 138             unregister(pnfCorrelationId);
 139             PnfNotificationEvent pnfNotificationEvent = new PnfNotificationEvent(this, pnfCorrelationId);
 140             applicationEventPublisher.publishEvent(pnfNotificationEvent);
 141         }
 142     }
 143 }