/*
    * 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.
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  package org.apache.hadoop.hbase.chaos.actions;
  
  import java.util.Random;
  
  import org.apache.hadoop.hbase.HBaseTestingUtility;
  import org.apache.hadoop.hbase.HTableDescriptor;
  import org.apache.hadoop.hbase.TableName;
  import org.apache.hadoop.hbase.client.Admin;
  import org.apache.hadoop.hbase.regionserver.ConstantSizeRegionSplitPolicy;
  import org.apache.hadoop.hbase.regionserver.DisabledRegionSplitPolicy;
  import org.apache.hadoop.hbase.regionserver.IncreasingToUpperBoundRegionSplitPolicy;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class ChangeSplitPolicyAction extends Action {
    private static final Logger LOG = LoggerFactory.getLogger(ChangeSplitPolicyAction.class);
    private final TableName tableName;
    private final String[] possiblePolicies;
    private final Random random;
  
    public ChangeSplitPolicyAction(TableName tableName) {
      this.tableName = tableName;
      possiblePolicies = new String[] {
          IncreasingToUpperBoundRegionSplitPolicy.class.getName(),
          ConstantSizeRegionSplitPolicy.class.getName(),
          DisabledRegionSplitPolicy.class.getName()
      };
      this.random = new Random();
    }
  
    @Override protected Logger getLogger() {
      return LOG;
    }
  
    @Override
    public void perform() throws Exception {
      HBaseTestingUtility util = context.getHBaseIntegrationTestingUtility();
      Admin admin = util.getHBaseAdmin();
  
      getLogger().info("Performing action: Change split policy of table " + tableName);
      HTableDescriptor tableDescriptor = admin.getTableDescriptor(tableName);
      String chosenPolicy = possiblePolicies[random.nextInt(possiblePolicies.length)];
      tableDescriptor.setRegionSplitPolicyClassName(chosenPolicy);
      getLogger().info("Changing "  + tableName + " split policy to " + chosenPolicy);
      admin.modifyTable(tableName, tableDescriptor);
    }
  }