content: /**
   * 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.ui.utils;
  
  import backtype.storm.utils.NimbusClient;
  import com.alibaba.jstorm.utils.ExpiredCallback;
  import com.alibaba.jstorm.utils.TimeCacheMap;
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.Map;
  
  /**
   * @author Jark (wuchong.wc@alibaba-inc.com)
   */
  public class NimbusClientManager {
      private static Logger LOG = LoggerFactory.getLogger(NimbusClientManager.class);
  
      protected static TimeCacheMap<String, NimbusClient> clientManager;
  
      static {
          clientManager = new TimeCacheMap<String, NimbusClient>(3600,
                  new ExpiredCallback<String, NimbusClient>() {
  
                      @Override
                      public void expire(String key, NimbusClient val) {
                          LOG.info("Close connection of " + key);
                          val.close();
                      }
  
                  });
      }
  
      public static NimbusClient getNimbusClient(String clusterName) throws Exception {
          Map conf = UIUtils.readUiConfig();
          NimbusClient client = clientManager.get(clusterName);
          if (client != null) {
              try {
                  client.getClient().getVersion();
                  LOG.info("get Nimbus Client from clientManager");
              } catch (Exception e) {
                  LOG.info("Nimbus has been restarted, it begin to reconnect");
                  client = null;
              }
          }
  
          if (client == null) {
              conf = UIUtils.resetZKConfig(conf, clusterName);
              client = NimbusClient.getConfiguredClient(conf);
              clientManager.put(clusterName, client);
          }
  
          return client;
      }
  
      public static void removeClient(String clusterName) {
          if (StringUtils.isBlank(clusterName)) {
              clusterName = UIDef.DEFAULT_CLUSTER_NAME;
          }
          NimbusClient client = (NimbusClient) clientManager.remove(clusterName);
          if (client != null) {
              client.close();
          }
      }
  
      public static int getClientSize(){
          return clientManager.size();
      }
  
  }