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
  54
  55
  56     @Autowired
  57     public PnfEventReadyDmaapClient(Environment env) {
  58         httpClient = HttpClientBuilder.create().build();
  59         pnfCorrelationIdToThreadMap = new ConcurrentHashMap<>();
  60         topicListenerDelayInSeconds = env.getProperty("pnf.dmaap.topicListenerDelayInSeconds", Integer.class);
  61         executor = null;
  62         getRequestForpnfReady = new HttpGet(UriBuilder.fromUri(env.getProperty("pnf.dmaap.uriPathPrefix"))
  63                 .scheme(env.getProperty("pnf.dmaap.protocol")).host(env.getProperty("pnf.dmaap.host"))
  64                 .port(env.getProperty("pnf.dmaap.port", Integer.class))
  65                 .path(env.getProperty("pnf.dmaap.pnfReadyTopicName")).path(env.getProperty("pnf.dmaap.consumerGroup"))
  66                 .path(env.getProperty("pnf.dmaap.consumerId")).build());
  67         getRequestForPnfUpdate = 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))
  70                 .path(env.getProperty("pnf.dmaap.pnfUpdateTopicName")).path(env.getProperty("pnf.dmaap.consumerGroup"))
  71                 .path(env.getProperty("pnf.dmaap.consumerIdUpdate")).build());
  72     }
  73
  74
  75     @Override
  76     public synchronized void registerForUpdate(String pnfCorrelationId, Runnable informConsumer) {
  77         logger.debug("registering for pnf ready dmaap event for pnf correlation id: {}", pnfCorrelationId);
  78         pnfCorrelationIdToThreadMap.put(pnfCorrelationId, informConsumer);
  79         if (!dmaapThreadListenerIsRunning) {
  80             startDmaapThreadListener();
  81         }
  82     }
  83
  84     @Override
  85     public synchronized Runnable unregister(String pnfCorrelationId) {
  86         logger.debug("unregistering from pnf ready dmaap event for pnf correlation id: {}", pnfCorrelationId);
  87         Runnable runnable = pnfCorrelationIdToThreadMap.remove(pnfCorrelationId);
  88         if (pnfCorrelationIdToThreadMap.isEmpty()) {
  89             stopDmaapThreadListener();
  90         }
  91         return runnable;
  92     }
  93
  94     private synchronized void startDmaapThreadListener() {
  95         if (!dmaapThreadListenerIsRunning) {
  96             executor = new ScheduledThreadPoolExecutor(1);
  97             executor.setContinueExistingPeriodicTasksAfterShutdownPolicy(false);
  98             executor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
  99             executor.scheduleWithFixedDelay(new DmaapTopicListenerThread(), 0, topicListenerDelayInSeconds,
 100                     TimeUnit.SECONDS);
 101             dmaapThreadListenerIsRunning = true;
 102         }
 103     }
 104
 105     private synchronized void stopDmaapThreadListener() {
 106         if (dmaapThreadListenerIsRunning) {
 107             executor.shutdown();
 108             dmaapThreadListenerIsRunning = false;
 109             executor = null;
 110         }
 111     }
 112
 113     class DmaapTopicListenerThread implements Runnable {
 114         @Override
 115         public void run() {
 116             try {
 117                 HttpResponse response;
 118                 response = httpClient.execute(getRequestForPnfUpdate);
 119                 List<String> pnfUpdateResponse = getPnfCorrelationIdListFromResponse(response);
 120                 if (pnfUpdateResponse.isEmpty()) {
 121                     response = httpClient.execute(getRequestForpnfReady);
 122                     getPnfCorrelationIdListFromResponse(response)
 123                             .forEach(this::informAboutPnfReadyIfPnfCorrelationIdFound);
 124                 } else {
 125                     pnfUpdateResponse.forEach(this::informAboutPnfReadyIfPnfCorrelationIdFound);
 126                 }
 127             } catch (IOException e) {
 128                 logger.error("Exception caught during sending rest request to dmaap for listening event topic", e);
 129             } finally {
 130                 getRequestForpnfReady.reset();
 131                 getRequestForPnfUpdate.reset();
 132             }
 133         }
 134
 135         private List<String> getPnfCorrelationIdListFromResponse(HttpResponse response) throws IOException {
 136             if (response.getStatusLine().getStatusCode() == 200) {
 137                 String responseString = EntityUtils.toString(response.getEntity(), "UTF-8");
 138                 if (responseString != null) {
 139                     return JsonUtilForPnfCorrelationId.parseJsonToGelAllPnfCorrelationId(responseString);
 140                 }
 141             }
 142             return Collections.emptyList();
 143         }
 144
 145         private void informAboutPnfReadyIfPnfCorrelationIdFound(String pnfCorrelationId) {
 146             Runnable runnable = unregister(pnfCorrelationId);
 147             if (runnable != null) {
 148                 logger.debug("dmaap listener gets pnf ready event for pnfCorrelationId: {}", pnfCorrelationId);
 149                 runnable.run();
 150             }
 151         }
 152     }
 153 }
 154