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/*
* ============LICENSE_START=======================================================
* ONAP : DATALAKE
* ================================================================================
* Copyright 2019 China Mobile
*=================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.onap.datalake.feeder.service;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.PostConstruct;
import org.apache.commons.collections.CollectionUtils;
import org.onap.datalake.feeder.config.ApplicationConfiguration;
import org.onap.datalake.feeder.dto.TopicConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
/**
* Service to check topic changes in Kafka and topic setting updates in DB
*
* @author Guobiao Mo
*
*/
@Service
public class TopicConfigPollingService implements Runnable {
private final Logger log = LoggerFactory.getLogger(this.getClass());
@Autowired
ApplicationConfiguration config;
@Autowired
private DmaapService dmaapService;
//effective TopicConfig Map
private Map<String, TopicConfig> effectiveTopicConfigMap = new HashMap<>();
//monitor Kafka topic list changes
private List<String> activeTopics;
private ThreadLocal<Integer> activeTopicsVersionLocal = ThreadLocal.withInitial(() -> -1);
private int currentActiveTopicsVersion = -1;
private boolean active = false;
@PostConstruct
private void init() {
try {
log.info("init(), ccalling poll()...");
activeTopics = poll();
currentActiveTopicsVersion++;
} catch (Exception ex) {
log.error("error connection to HDFS.", ex);
}
}
public boolean isActiveTopicsChanged(boolean update) {//update=true means sync local version
boolean changed = currentActiveTopicsVersion > activeTopicsVersionLocal.get();
log.debug("isActiveTopicsChanged={}, currentActiveTopicsVersion={} local={}", changed, currentActiveTopicsVersion, activeTopicsVersionLocal.get());
if (changed && update) {
activeTopicsVersionLocal.set(currentActiveTopicsVersion);
}
return changed;
}
public List<String> getActiveTopics() {
return activeTopics;
}
public TopicConfig getEffectiveTopicConfig(String topicStr) {
return effectiveTopicConfigMap.get(topicStr);
}
@Override
public void run() {
active = true;
log.info("TopicConfigPollingService started.");
while (active) {
try { //sleep first since we already pool in init()
Thread.sleep(config.getDmaapCheckNewTopicInterval());
if(!active) {
break;
}
} catch (InterruptedException e) {
log.error("Thread.sleep(config.getDmaapCheckNewTopicInterval())", e);
Thread.currentThread().interrupt();
}
try {
List<String> newTopics = poll();
if (!CollectionUtils.isEqualCollection(activeTopics, newTopics)) {
log.info("activeTopics list is updated, old={}", activeTopics);
log.info("activeTopics list is updated, new={}", newTopics);
activeTopics = newTopics;
currentActiveTopicsVersion++;
} else {
log.debug("activeTopics list is not updated.");
}
} catch (IOException e) {
log.error("dmaapService.getActiveTopics()", e);
}
}
log.info("exit since active is set to false");
}
public void shutdown() {
active = false;
}
private List<String> poll() throws IOException {
log.debug("poll(), use dmaapService to getActiveTopicConfigs...");
List<TopicConfig> activeTopicConfigs = dmaapService.getActiveTopicConfigs();
Map<String, TopicConfig> tempEffectiveTopicConfigMap = new HashMap<>();
activeTopicConfigs.stream().forEach(topicConfig -> tempEffectiveTopicConfigMap.put(topicConfig.getName(), topicConfig));
effectiveTopicConfigMap = tempEffectiveTopicConfigMap;
log.debug("poll(), effectiveTopicConfigMap={}", effectiveTopicConfigMap);
List<String> ret = new ArrayList<>(activeTopicConfigs.size());
activeTopicConfigs.stream().forEach(topicConfig -> ret.add(topicConfig.getName()));
return ret;
}
}
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