/*
    * 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.Random;
  
  import org.apache.hadoop.hbase.HColumnDescriptor;
  import org.apache.hadoop.hbase.HTableDescriptor;
  import org.apache.hadoop.hbase.TableName;
  import org.apache.hadoop.hbase.client.Admin;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Action that changes the number of versions on a column family from a list of tables.
   *
   * Always keeps at least 1 as the number of versions.
   */
  public class ChangeVersionsAction extends Action {
    private static final Logger LOG = LoggerFactory.getLogger(ChangeVersionsAction.class);
    private final TableName tableName;
    private final Random random;
  
    private Admin admin;
  
    public ChangeVersionsAction(TableName tableName) {
      this.tableName = tableName;
      this.random = new Random();
    }
  
    @Override protected Logger getLogger() {
      return LOG;
    }
  
    @Override
    public void init(ActionContext context) throws IOException {
      super.init(context);
      this.admin = context.getHBaseIntegrationTestingUtility().getHBaseAdmin();
    }
  
    @Override
    public void perform() throws Exception {
      HTableDescriptor tableDescriptor = admin.getTableDescriptor(tableName);
      HColumnDescriptor[] columnDescriptors = tableDescriptor.getColumnFamilies();
  
      if ( columnDescriptors == null || columnDescriptors.length == 0) {
        return;
      }
  
      int versions =  random.nextInt(3) + 1;
      for(HColumnDescriptor descriptor:columnDescriptors) {
        descriptor.setVersions(versions, versions);
      }
      // Don't try the modify if we're stopping
      if (context.isStopping()) {
        return;
      }
      getLogger().debug("Performing action: Changing versions on " + tableName.getNameAsString());
      admin.modifyTable(tableName, tableDescriptor);
    }
  }