/**
    * 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.client.backoff;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.protobuf.generated.ClientProtos;
  import org.apache.hadoop.hbase.util.Bytes;
  
  import java.util.Map;
  import java.util.TreeMap;
  
  /**
   * Track the statistics for a single region
   */
  @InterfaceAudience.Private
  public class ServerStatistics {
  
    private Map<byte[], RegionStatistics>
        stats = new TreeMap<byte[], RegionStatistics>(Bytes.BYTES_COMPARATOR);
  
    /**
     * Good enough attempt. Last writer wins. It doesn't really matter which one gets to update,
     * as something gets set
     * @param region
     * @param currentStats
     */
    public void update(byte[] region, ClientProtos.RegionLoadStats currentStats) {
      RegionStatistics regionStat = this.stats.get(region);
      if(regionStat == null){
        regionStat = new RegionStatistics();
        this.stats.put(region, regionStat);
      }
  
      regionStat.update(currentStats);
    }
  
    @InterfaceAudience.Private
    public RegionStatistics getStatsForRegion(byte[] regionName){
      return stats.get(regionName);
    }
  
    public static class RegionStatistics {
      private int memstoreLoad = 0;
      private int heapOccupancy = 0;
      private int compactionPressure = 0;
  
      public void update(ClientProtos.RegionLoadStats currentStats) {
        this.memstoreLoad = currentStats.getMemstoreLoad();
        this.heapOccupancy = currentStats.getHeapOccupancy();
        this.compactionPressure = currentStats.getCompactionPressure();
      }
  
      public int getMemstoreLoadPercent(){
        return this.memstoreLoad;
      }
  
      public int getHeapOccupancyPercent(){
        return this.heapOccupancy;
      }
  
      public int getCompactionPressure() {
        return compactionPressure;
      }
  
    }
  }