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 backtype.storm.command;
  
  import java.util.Map;
  
  import org.apache.commons.lang.StringUtils;
  
  import backtype.storm.generated.ClusterSummary;
  import backtype.storm.generated.TopologyInfo;
  import backtype.storm.utils.NimbusClient;
  import backtype.storm.utils.Utils;
  
  /**
   * print summary of a topology/cluster
   *
   * @author longda
   */
  public class list {
  
      public static void main(String[] args) {
          NimbusClient client = null;
          try {
              Map conf = Utils.readStormConfig();
              client = NimbusClient.getConfiguredClient(conf);
  
              if (args.length > 0 && !StringUtils.isBlank(args[0])) {
                  String topologyName = args[0];
                  TopologyInfo info = client.getClient().getTopologyInfoByName(topologyName);
                  System.out.println("Successfully get topology info \n" + Utils.toPrettyJsonString(info));
              } else {
                  ClusterSummary clusterSummary = client.getClient().getClusterInfo();
                  System.out.println("Successfully get cluster info \n" + Utils.toPrettyJsonString(clusterSummary));
              }
          } catch (Exception e) {
              System.out.println(e.getMessage());
              e.printStackTrace();
              throw new RuntimeException(e);
          } finally {
              if (client != null) {
                  client.close();
              }
          }
      }
  
  }
  