content: /*
   * 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.cassandra.db.compaction;
  
  import java.util.Map;
  
  import org.apache.cassandra.exceptions.ConfigurationException;
  
  public final class SizeTieredCompactionStrategyOptions
  {
      protected static final long DEFAULT_MIN_SSTABLE_SIZE = 50L * 1024L * 1024L;
      protected static final double DEFAULT_BUCKET_LOW = 0.5;
      protected static final double DEFAULT_BUCKET_HIGH = 1.5;
      public static final String MIN_SSTABLE_SIZE_KEY = "min_sstable_size";
      public static final String BUCKET_LOW_KEY = "bucket_low";
      public static final String BUCKET_HIGH_KEY = "bucket_high";
  
      protected long minSSTableSize;
      protected double bucketLow;
      protected double bucketHigh;
  
      public SizeTieredCompactionStrategyOptions(Map<String, String> options)
      {
          String optionValue = options.get(MIN_SSTABLE_SIZE_KEY);
          minSSTableSize = optionValue == null ? DEFAULT_MIN_SSTABLE_SIZE : Long.parseLong(optionValue);
          optionValue = options.get(BUCKET_LOW_KEY);
          bucketLow = optionValue == null ? DEFAULT_BUCKET_LOW : Double.parseDouble(optionValue);
          optionValue = options.get(BUCKET_HIGH_KEY);
          bucketHigh = optionValue == null ? DEFAULT_BUCKET_HIGH : Double.parseDouble(optionValue);
      }
  
      public SizeTieredCompactionStrategyOptions()
      {
          minSSTableSize = DEFAULT_MIN_SSTABLE_SIZE;
          bucketLow = DEFAULT_BUCKET_LOW;
          bucketHigh = DEFAULT_BUCKET_HIGH;
      }
  
      private static double parseDouble(Map<String, String> options, String key, double defaultValue) throws ConfigurationException
      {
          String optionValue = options.get(key);
          try
          {
              return optionValue == null ? defaultValue : Double.parseDouble(optionValue);
          }
          catch (NumberFormatException e)
          {
              throw new ConfigurationException(String.format("%s is not a parsable float for %s", optionValue, key), e);
          }
      }
  
      public static Map<String, String> validateOptions(Map<String, String> options, Map<String, String> uncheckedOptions) throws ConfigurationException
      {
          String optionValue = options.get(MIN_SSTABLE_SIZE_KEY);
          try
          {
              long minSSTableSize = optionValue == null ? DEFAULT_MIN_SSTABLE_SIZE : Long.parseLong(optionValue);
              if (minSSTableSize < 0)
              {
                  throw new ConfigurationException(String.format("%s must be non negative: %d", MIN_SSTABLE_SIZE_KEY, minSSTableSize));
              }
          }
          catch (NumberFormatException e)
          {
              throw new ConfigurationException(String.format("%s is not a parsable int (base10) for %s", optionValue, MIN_SSTABLE_SIZE_KEY), e);
          }
  
          double bucketLow = parseDouble(options, BUCKET_LOW_KEY, DEFAULT_BUCKET_LOW);
          double bucketHigh = parseDouble(options, BUCKET_HIGH_KEY, DEFAULT_BUCKET_HIGH);
          if (bucketHigh <= bucketLow)
          {
              throw new ConfigurationException(String.format("%s value (%s) is less than or equal to the %s value (%s)",
                                                             BUCKET_HIGH_KEY, bucketHigh, BUCKET_LOW_KEY, bucketLow));
          }
  
          uncheckedOptions.remove(MIN_SSTABLE_SIZE_KEY);
          uncheckedOptions.remove(BUCKET_LOW_KEY);
          uncheckedOptions.remove(BUCKET_HIGH_KEY);
  
          return uncheckedOptions;
      }
  
      @Override
      public String toString()
      {
          return String.format("Min sstable size: %d, bucket low: %f, bucket high: %f", minSSTableSize, bucketLow, bucketHigh);
      }
  
  }
  