/*
    * 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 org.apache.hadoop.hbase.chaos.actions;
  
  import java.io.IOException;
  import java.util.Collection;
  
  import org.apache.commons.lang.math.RandomUtils;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.ServerName;
  import org.apache.hadoop.hbase.TableName;
  import org.apache.hadoop.hbase.client.HTable;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
  * Action that restarts an HRegionServer holding one of the regions of the table.
  */
  public class RestartRsHoldingTableAction extends RestartActionBaseAction {
    private static final Logger LOG =
        LoggerFactory.getLogger(RestartRsHoldingTableAction.class);
  
    private final String tableName;
  
    public RestartRsHoldingTableAction(long sleepTime, String tableName) {
      super(sleepTime);
      this.tableName = tableName;
    }
  
    @Override protected Logger getLogger() {
      return LOG;
    }
  
    @Override
    public void perform() throws Exception {
      HTable table = null;
      try {
        getLogger().info("Performing action: Restart random RS holding table " + this.tableName);
        Configuration conf = context.getHBaseIntegrationTestingUtility().getConfiguration();
        table = new HTable(conf, TableName.valueOf(tableName));
      } catch (IOException e) {
        getLogger().debug("Error creating HTable used to get list of region locations.", e);
        return;
      }
  
      Collection<ServerName> serverNames = table.getRegionLocations().values();
      ServerName[] nameArray = serverNames.toArray(new ServerName[serverNames.size()]);
  
      restartRs(nameArray[RandomUtils.nextInt(nameArray.length)], sleepTime);
    }
  }