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

   1 /**
   2  * Copyright 2021 ZTE Corporation.
   3  * <p>
   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  * <p>
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  * <p>
  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
  17 package org.onap.holmes.engine.dcae;
  18
  19 import org.onap.holmes.common.ConfigFileScanner;
  20 import org.onap.holmes.common.dcae.DcaeConfigurationsCache;
  21 import org.onap.holmes.common.dcae.entity.DcaeConfigurations;
  22 import org.onap.holmes.common.dcae.utils.DcaeConfigurationParser;
  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 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 import java.util.Map;
  32
  33 public class ConfigFileScanningTask implements Runnable {
  34     final public static long POLLING_PERIOD = 60L;
  35     final private static Logger LOGGER = LoggerFactory.getLogger(ConfigFileScanningTask.class);
  36     private String configFile = "/opt/hemtopics/cfy.json";
  37     private ConfigFileScanner configFileScanner;
  38     private String prevConfigMd5 = Md5Util.md5(null);
  39
  40     public ConfigFileScanningTask(ConfigFileScanner configFileScanner) {
  41         this.configFileScanner = configFileScanner;
  42     }
  43
  44     @Override
  45     public void run() {
  46         if (null == configFileScanner) {
  47             configFileScanner = new ConfigFileScanner();
  48         }
  49         Map<String, String> newConfig = configFileScanner.scan(configFile);
  50         String md5 = Md5Util.md5(newConfig);
  51         if (!prevConfigMd5.equals(md5)) {
  52             LOGGER.info("Configurations have changed.");
  53             prevConfigMd5 = md5;
  54         } else {
  55             return;
  56         }
  57
  58         for (Map.Entry entry : newConfig.entrySet()) {
  59             DcaeConfigurations dcaeConfigurations = null;
  60             try {
  61                 dcaeConfigurations = DcaeConfigurationParser.parse(entry.getValue().toString());
  62                 if (dcaeConfigurations != null) {
  63                     DcaeConfigurationsCache.setDcaeConfigurations(dcaeConfigurations);
  64                     addSubscribers(dcaeConfigurations);
  65                 }
  66             } catch (CorrelationException e) {
  67                 LOGGER.error(e.getMessage(), e);
  68                 // reset the value of the pre-md5 so that configs could be re-processed during the next scanning.
  69                 prevConfigMd5 = null;
  70             } catch (Exception e) {
  71                 LOGGER.warn("Failed to deal with the new configurations.", e);
  72                 // reset the value of the pre-md5 so that configs could be re-processed during the next scanning.
  73                 prevConfigMd5 = null;
  74             }
  75         }
  76     }
  77
  78     private void addSubscribers(DcaeConfigurations dcaeConfigurations) {
  79         SubscriberAction subscriberAction = ServiceLocatorHolder.getLocator()
  80                 .getService(SubscriberAction.class);
  81         for (String key : dcaeConfigurations.getSubKeys()) {
  82             Subscriber subscriber = new Subscriber();
  83             subscriber.setTopic(key);
  84             subscriber.setUrl(dcaeConfigurations.getSubSecInfo(key).getDmaapInfo()
  85                     .getTopicUrl());
  86             subscriberAction.addSubscriber(subscriber);
  87         }
  88     }
  89 }