gerrit.onap Code Review - dcaegen2/services.git/blob

   1 /*
   2 * ============LICENSE_START=======================================================
   3 * ONAP : DATALAKE
   4 * ================================================================================
   5 * Copyright 2019 China Mobile
   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.onap.datalake.feeder.service;
  22
  23 import java.io.IOException;
  24 import java.util.ArrayList;
  25 import java.util.HashMap;
  26 import java.util.List;
  27 import java.util.Map;
  28
  29 import javax.annotation.PostConstruct;
  30
  31 import org.apache.commons.collections.CollectionUtils;
  32 import org.onap.datalake.feeder.config.ApplicationConfiguration;
  33 import org.onap.datalake.feeder.dto.TopicConfig;
  34 import org.slf4j.Logger;
  35 import org.slf4j.LoggerFactory;
  36 import org.springframework.beans.factory.annotation.Autowired;
  37 import org.springframework.stereotype.Service;
  38
  39 /**
  40  * Service to check topic changes in Kafka and topic setting updates
  41  *
  42  * @author Guobiao Mo
  43  *
  44  */
  45 @Service
  46 public class TopicConfigPollingService implements Runnable {
  47
  48         private final Logger log = LoggerFactory.getLogger(this.getClass());
  49
  50         @Autowired
  51         ApplicationConfiguration config;
  52
  53         @Autowired
  54         private DmaapService dmaapService;
  55
  56         //effective TopicConfig Map
  57         private Map<String, TopicConfig> effectiveTopicConfigMap = new HashMap<>();
  58
  59         //monitor Kafka topic list changes
  60         private List<String> activeTopics;
  61         private ThreadLocal<Integer> activeTopicsVersionLocal = ThreadLocal.withInitial(() -> -1);
  62         private int currentActiveTopicsVersion = -1;
  63
  64         private boolean active = false;
  65
  66         @PostConstruct
  67         private void init() {
  68                 try {
  69                         log.info("init(), ccalling poll()...");
  70                         activeTopics = poll();
  71                         currentActiveTopicsVersion++;
  72                 } catch (Exception ex) {
  73                         log.error("error connection to HDFS.", ex);
  74                 }
  75         }
  76
  77         public boolean isActiveTopicsChanged(boolean update) {
  78                 boolean changed = currentActiveTopicsVersion > activeTopicsVersionLocal.get();
  79                 log.debug("isActiveTopicsChanged={}, currentActiveTopicsVersion={} local={}", changed, currentActiveTopicsVersion, activeTopicsVersionLocal.get());
  80                 if (changed && update) {
  81                         activeTopicsVersionLocal.set(currentActiveTopicsVersion);
  82                 }
  83
  84                 return changed;
  85         }
  86
  87         public List<String> getActiveTopics() {
  88                 return activeTopics;
  89         }
  90
  91         public TopicConfig getEffectiveTopicConfig(String topicStr) {
  92                 return effectiveTopicConfigMap.get(topicStr);
  93         }
  94
  95         @Override
  96         public void run() {
  97                 active = true;
  98                 log.info("TopicConfigPollingService started.");
  99
 100                 while (active) {
 101                         try { //sleep first since we already pool in init()
 102                                 Thread.sleep(config.getDmaapCheckNewTopicInterval());
 103                         } catch (InterruptedException e) {
 104                                 log.error("Thread.sleep(config.getDmaapCheckNewTopicInterval())", e);
 105                                 Thread.currentThread().interrupt();
 106                         }
 107
 108                         try {
 109                                 List<String> newTopics = poll();
 110                                 if (!CollectionUtils.isEqualCollection(activeTopics, newTopics)) {
 111                                         log.info("activeTopics list is updated, old={}", activeTopics);
 112                                         log.info("activeTopics list is updated, new={}", newTopics);
 113
 114                                         activeTopics = newTopics;
 115                                         currentActiveTopicsVersion++;
 116                                 } else {
 117                                         log.debug("activeTopics list is not updated.");
 118                                 }
 119                         } catch (IOException e) {
 120                                 log.error("dmaapService.getActiveTopics()", e);
 121                         }
 122                 }
 123
 124                 log.info("exit since active is set to false");
 125         }
 126
 127         public void shutdown() {
 128                 active = false;
 129         }
 130
 131         private List<String> poll() throws IOException {
 132                 log.debug("poll(), use dmaapService to getActiveTopicConfigs...");
 133                 List<TopicConfig> activeTopicConfigs = dmaapService.getActiveTopicConfigs();
 134                 activeTopicConfigs.stream().forEach(topicConfig -> effectiveTopicConfigMap.put(topicConfig.getName(), topicConfig));
 135
 136                 List<String> ret = new ArrayList<>(activeTopicConfigs.size());
 137                 activeTopicConfigs.stream().forEach(topicConfig -> ret.add(topicConfig.getName()));
 138
 139                 return ret;
 140         }
 141
 142 }