text: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.
   */
  package com.alibaba.jstorm.batch.util;
  
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import backtype.storm.Config;
  
  import com.alibaba.jstorm.cluster.ClusterState;
  import com.alibaba.jstorm.cluster.DistributedClusterState;
  import com.alibaba.jstorm.utils.JStormUtils;
  
  public class BatchCommon {
      private static final Logger LOG = LoggerFactory.getLogger(BatchCommon.class);
  
      private static ClusterState zkClient = null;
  
      public static ClusterState getZkClient(Map conf) throws Exception {
          synchronized (BatchCommon.class) {
              if (zkClient != null) {
                  return zkClient;
              }
  
              List<String> zkServers;
              if (conf.get(Config.TRANSACTIONAL_ZOOKEEPER_SERVERS) != null) {
                  zkServers = (List<String>) conf.get(Config.TRANSACTIONAL_ZOOKEEPER_SERVERS);
              } else if (conf.get(Config.STORM_ZOOKEEPER_SERVERS) != null) {
                  zkServers = (List<String>) conf.get(Config.STORM_ZOOKEEPER_SERVERS);
              } else {
                  throw new RuntimeException("No setting zk");
              }
  
              int port = 2181;
              if (conf.get(Config.TRANSACTIONAL_ZOOKEEPER_PORT) != null) {
                  port = JStormUtils.parseInt(conf.get(Config.TRANSACTIONAL_ZOOKEEPER_PORT), 2181);
              } else if (conf.get(Config.STORM_ZOOKEEPER_PORT) != null) {
                  port = JStormUtils.parseInt(conf.get(Config.STORM_ZOOKEEPER_PORT), 2181);
              }
  
              String root = BatchDef.BATCH_ZK_ROOT;
              if (conf.get(Config.TRANSACTIONAL_ZOOKEEPER_ROOT) != null) {
                  root = (String) conf.get(Config.TRANSACTIONAL_ZOOKEEPER_ROOT);
              }
  
              root = root + BatchDef.ZK_SEPERATOR + conf.get(Config.TOPOLOGY_NAME);
  
              Map<Object, Object> tmpConf = new HashMap<>();
              tmpConf.putAll(conf);
              tmpConf.put(Config.STORM_ZOOKEEPER_SERVERS, zkServers);
              tmpConf.put(Config.STORM_ZOOKEEPER_ROOT, root);
              zkClient = new DistributedClusterState(tmpConf);
  
              LOG.info("Successfully connect ZK");
              return zkClient;
          }
  
      }
  }
  