bpmn/MSOInfrastructureBPMN/src/main/java/org/openecomp/mso/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  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=========================================================
  19  */
  20
  21 package org.openecomp.mso.bpmn.infrastructure.pnf.dmaap;
  22
  23 import java.io.IOException;
  24 import java.net.URI;
  25 import java.util.Map;
  26 import java.util.Optional;
  27 import java.util.concurrent.ConcurrentHashMap;
  28 import java.util.concurrent.Executors;
  29 import java.util.concurrent.ScheduledExecutorService;
  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.openecomp.mso.jsonpath.JsonPathUtil;
  38 import org.openecomp.mso.logger.MsoLogger;
  39
  40 public class PnfEventReadyDmaapClient implements DmaapClient {
  41
  42     private static final MsoLogger LOGGER = MsoLogger.getMsoLogger(MsoLogger.Catalog.RA);
  43
  44     private static final String JSON_PATH_CORRELATION_ID = "$.pnfRegistrationFields.correlationId";
  45     private HttpClient httpClient;
  46     private String dmaapHost;
  47     private int dmaapPort;
  48     private String dmaapProtocol;
  49     private String dmaapUriPathPrefix;
  50     private String dmaapTopicName;
  51     private String consumerId;
  52     private String consumerGroup;
  53     private Map<String, Runnable> pnfCorrelationIdToThreadMap;
  54     private HttpGet getRequest;
  55     private ScheduledExecutorService executor;
  56     private int dmaapClientDelayInSeconds;
  57     private volatile boolean dmaapThreadListenerIsRunning;
  58
  59     public PnfEventReadyDmaapClient() {
  60         httpClient = HttpClientBuilder.create().build();
  61         pnfCorrelationIdToThreadMap = new ConcurrentHashMap<>();
  62         executor = null;
  63     }
  64
  65     public void init() {
  66         getRequest = new HttpGet(buildURI());
  67     }
  68
  69     @Override
  70     public synchronized void registerForUpdate(String correlationId, Runnable informConsumer) {
  71         pnfCorrelationIdToThreadMap.put(correlationId, informConsumer);
  72         if (!dmaapThreadListenerIsRunning) {
  73             startDmaapThreadListener();
  74         }
  75     }
  76
  77     @Override
  78     public synchronized Runnable unregister(String correlationId) {
  79         Runnable runnable = pnfCorrelationIdToThreadMap.remove(correlationId);
  80         if (pnfCorrelationIdToThreadMap.isEmpty()) {
  81             stopDmaapThreadListener();
  82         }
  83         return runnable;
  84     }
  85
  86     private synchronized void startDmaapThreadListener() {
  87         if (!dmaapThreadListenerIsRunning) {
  88             executor = Executors.newScheduledThreadPool(1);
  89             executor.scheduleWithFixedDelay(new DmaapTopicListenerThread(), 0,
  90                     dmaapClientDelayInSeconds, TimeUnit.SECONDS);
  91             dmaapThreadListenerIsRunning = true;
  92         }
  93     }
  94
  95     private synchronized void stopDmaapThreadListener() {
  96         if (dmaapThreadListenerIsRunning) {
  97             executor.shutdownNow();
  98             dmaapThreadListenerIsRunning = false;
  99             executor = null;
 100         }
 101     }
 102
 103     private URI buildURI() {
 104         return UriBuilder.fromUri(dmaapUriPathPrefix)
 105                 .scheme(dmaapProtocol)
 106                 .host(dmaapHost)
 107                 .port(dmaapPort).path(dmaapTopicName)
 108                 .path(consumerGroup).path(consumerId).build();
 109     }
 110
 111     public void setDmaapHost(String dmaapHost) {
 112         this.dmaapHost = dmaapHost;
 113     }
 114
 115     public void setDmaapPort(int dmaapPort) {
 116         this.dmaapPort = dmaapPort;
 117     }
 118
 119     public void setDmaapProtocol(String dmaapProtocol) {
 120         this.dmaapProtocol = dmaapProtocol;
 121     }
 122
 123     public void setDmaapUriPathPrefix(String dmaapUriPathPrefix) {
 124         this.dmaapUriPathPrefix = dmaapUriPathPrefix;
 125     }
 126
 127     public void setDmaapTopicName(String dmaapTopicName) {
 128         this.dmaapTopicName = dmaapTopicName;
 129     }
 130
 131     public void setConsumerId(String consumerId) {
 132         this.consumerId = consumerId;
 133     }
 134
 135     public void setConsumerGroup(String consumerGroup) {
 136         this.consumerGroup = consumerGroup;
 137     }
 138
 139     public void setDmaapClientDelayInSeconds(int dmaapClientDelayInSeconds) {
 140         this.dmaapClientDelayInSeconds = dmaapClientDelayInSeconds;
 141     }
 142
 143     class DmaapTopicListenerThread implements Runnable {
 144
 145         @Override
 146         public void run() {
 147             try {
 148                 HttpResponse response = httpClient.execute(getRequest);
 149                 getCorrelationIdFromResponse(response).ifPresent(this::informAboutPnfReadyIfCorrelationIdFound);
 150             } catch (IOException e) {
 151                 LOGGER.error("Exception caught during sending rest request to dmaap for listening event topic", e);
 152             }
 153         }
 154
 155         private Optional<String> getCorrelationIdFromResponse(HttpResponse response) throws IOException {
 156             if (response.getStatusLine().getStatusCode() == 200) {
 157                 String responseString = EntityUtils.toString(response.getEntity(), "UTF-8");
 158                 if (responseString != null) {
 159                     return JsonPathUtil.getInstance().locateResult(responseString, JSON_PATH_CORRELATION_ID);
 160                 }
 161             }
 162             return Optional.empty();
 163         }
 164
 165         private synchronized void informAboutPnfReadyIfCorrelationIdFound(String correlationId) {
 166             Runnable runnable = unregister(correlationId);
 167             if (runnable != null) {
 168                 runnable.run();
 169             }
 170         }
 171     }
 172
 173 }