engine-d/src/main/java/org/onap/holmes/engine/dcae/DcaeConfigurationPolling.java

   1 /**
   2  * Copyright 2017 ZTE Corporation.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.onap.holmes.engine.dcae;
  17
  18 import com.fasterxml.jackson.core.JsonProcessingException;
  19 import lombok.extern.slf4j.Slf4j;
  20 import org.onap.holmes.common.dcae.DcaeConfigurationQuery;
  21 import org.onap.holmes.common.dcae.DcaeConfigurationsCache;
  22 import org.onap.holmes.common.dcae.entity.DcaeConfigurations;
  23 import org.onap.holmes.common.dropwizard.ioc.utils.ServiceLocatorHolder;
  24 import org.onap.holmes.common.exception.CorrelationException;
  25 import org.onap.holmes.common.utils.Md5Util;
  26 import org.onap.holmes.dsa.dmaappolling.Subscriber;
  27 import org.onap.holmes.engine.dmaap.SubscriberAction;
  28
  29 @Slf4j
  30 public class DcaeConfigurationPolling implements Runnable {
  31
  32     private String hostname;
  33
  34     public static final long POLLING_PERIOD = 30 * 1000L;
  35
  36     private String prevConfigMd5 = Md5Util.md5(null);
  37
  38     public DcaeConfigurationPolling(String hostname) {
  39         this.hostname = hostname;
  40     }
  41
  42     @Override
  43     public void run() {
  44         DcaeConfigurations dcaeConfigurations = null;
  45         try {
  46             dcaeConfigurations = DcaeConfigurationQuery.getDcaeConfigurations(hostname);
  47             String md5 = Md5Util.md5(dcaeConfigurations);
  48             if (prevConfigMd5.equals(md5)){
  49                 log.info("Operation aborted due to identical Configurations.");
  50                 return;
  51             }
  52             prevConfigMd5 = md5;
  53         } catch (CorrelationException e) {
  54             log.error("Failed to poll the DCAE configurations. " + e.getMessage(), e);
  55         } catch (Exception e) {
  56             log.info("Failed to generate the MD5 information for new configurations.", e);
  57         }
  58         if (dcaeConfigurations != null) {
  59             DcaeConfigurationsCache.setDcaeConfigurations(dcaeConfigurations);
  60             addSubscribers(dcaeConfigurations);
  61         }
  62     }
  63
  64     private void addSubscribers(DcaeConfigurations dcaeConfigurations) {
  65         SubscriberAction subscriberAction = ServiceLocatorHolder.getLocator()
  66                 .getService(SubscriberAction.class);
  67         for (String key : dcaeConfigurations.getSubKeys()) {
  68             Subscriber subscriber = new Subscriber();
  69             subscriber.setTopic(key);
  70             subscriber.setUrl(dcaeConfigurations.getSubSecInfo(key).getDmaapInfo()
  71                     .getTopicUrl());
  72             subscriberAction.addSubscriber(subscriber);
  73         }
  74     }
  75 }