/*
    * 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.concurrent.ThreadLocalRandom;
  import org.apache.hadoop.hbase.HBaseTestingUtility;
  import org.apache.hadoop.hbase.TableName;
  import org.apache.hadoop.hbase.client.Admin;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class SplitAllRegionOfTableAction extends Action {
    private static final Logger LOG =
        LoggerFactory.getLogger(SplitAllRegionOfTableAction.class);
    private static final int DEFAULT_MAX_SPLITS = 3;
    private static final String MAX_SPLIT_KEY = "hbase.chaosmonkey.action.maxFullTableSplits";
  
    private final TableName tableName;
    private int maxFullTableSplits = DEFAULT_MAX_SPLITS;
    private int splits = 0;
  
    public SplitAllRegionOfTableAction(TableName tableName) {
      this.tableName = tableName;
    }
  
  
    public void init(ActionContext context) throws IOException {
      super.init(context);
      this.maxFullTableSplits = getConf().getInt(MAX_SPLIT_KEY, DEFAULT_MAX_SPLITS);
    }
  
    @Override protected Logger getLogger() {
      return LOG;
    }
  
    @Override
    public void perform() throws Exception {
      HBaseTestingUtility util = context.getHBaseIntegrationTestingUtility();
      Admin admin = util.getHBaseAdmin();
      // Don't try the split if we're stopping
      if (context.isStopping()) {
        return;
      }
  
  
      // Don't always split. This should allow splitting of a full table later in the run
      if (ThreadLocalRandom.current().nextDouble()
          < (((double) splits) / ((double) maxFullTableSplits)) / ((double) 2)) {
        splits++;
        getLogger().info("Performing action: Split all regions of {}", tableName);
        admin.split(tableName);
      } else {
        getLogger().info("Skipping split of all regions.");
      }
    }
  }