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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.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooKeeper;
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;
/**
* This service will handle all the communication with Kafka
*
* @author Guobiao Mo
*
*/
@Service
public class DmaapService {
private final Logger log = LoggerFactory.getLogger(this.getClass());
@Autowired
private ApplicationConfiguration config;
@Autowired
private TopicService topicService;
private ZooKeeper zk;
@PreDestroy
public void cleanUp() throws InterruptedException {
if (zk != null) {
zk.close();
}
}
@PostConstruct
private void init() throws IOException, InterruptedException {
zk = connect(config.getDmaapZookeeperHostPort());
}
//get all topic names from Zookeeper
//This method returns empty list if nothing found.
public List<String> getTopics() {
try {
if (zk == null) {
zk = connect(config.getDmaapZookeeperHostPort());
}
log.info("connecting to ZooKeeper {} for a list of topics.", config.getDmaapZookeeperHostPort());
List<String> topics = zk.getChildren("/brokers/topics", false);
String[] excludes = config.getDmaapKafkaExclude();
topics.removeAll(Arrays.asList(excludes));
log.info("list of topics: {}", topics);
return topics;
} catch (Exception e) {
zk = null;
log.error("Can not get topic list from Zookeeper, return empty list.", e);
return Collections.emptyList();
}
}
private ZooKeeper connect(String host) throws IOException, InterruptedException {
log.info("connecting to ZooKeeper {} ...", config.getDmaapZookeeperHostPort());
CountDownLatch connectedSignal = new CountDownLatch(1);
ZooKeeper ret = new ZooKeeper(host, 10000, new Watcher() {
public void process(WatchedEvent we) {
if (we.getState() == KeeperState.SyncConnected) {
connectedSignal.countDown();
}
}
});
connectedSignal.await();
return ret;
}
/*
public List<String> getActiveTopics() throws IOException {
log.debug("entering getActiveTopics()...");
List<TopicConfig> configList = getActiveTopicConfigs();
List<String> ret = new ArrayList<>(configList.size());
configList.stream().forEach(topicConfig -> ret.add(topicConfig.getName()));
return ret;
}
*/
public List<TopicConfig> getActiveTopicConfigs() throws IOException {
log.debug("entering getActiveTopicConfigs()...");
List<String> allTopics = getTopics();
List<TopicConfig> ret = new ArrayList<>(allTopics.size());
for (String topicStr : allTopics) {
log.debug("get topic setting from DB: {}.", topicStr);
TopicConfig topicConfig = topicService.getEffectiveTopic(topicStr, true);
if (topicConfig.isEnabled()) {
ret.add(topicConfig);
}
}
return ret;
}
}
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