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   * 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,
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.io.sstable.format;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.io.sstable.SSTable;
  import org.apache.cassandra.io.sstable.format.bti.BtiFormat;
  import org.apache.cassandra.io.sstable.metadata.StatsMetadata;
  import org.apache.cassandra.io.sstable.metadata.ValidationMetadata;
  import org.apache.cassandra.io.util.FileHandle;
  import org.apache.cassandra.utils.FBUtilities;
  import org.apache.cassandra.utils.IFilter;
  
  public abstract class SortedTableReaderLoadingBuilder<R extends SSTableReader, B extends SSTableReader.Builder<R, B>>
  extends SSTableReaderLoadingBuilder<R, B>
  {
      private final static Logger logger = LoggerFactory.getLogger(SortedTableReaderLoadingBuilder.class);
      private FileHandle.Builder dataFileBuilder;
  
      public SortedTableReaderLoadingBuilder(SSTable.Builder<?, ?> builder)
      {
          super(builder);
      }
  
      protected IFilter loadFilter(ValidationMetadata validationMetadata)
      {
          return FilterComponent.maybeLoadBloomFilter(descriptor,
                                                      components,
                                                      tableMetadataRef.get(),
                                                      validationMetadata);
      }
  
      protected FileHandle.Builder dataFileBuilder(StatsMetadata statsMetadata)
      {
          assert this.dataFileBuilder == null || this.dataFileBuilder.file.equals(descriptor.fileFor(BtiFormat.Components.DATA));
  
          logger.info("Opening {} ({})", descriptor, FBUtilities.prettyPrintMemory(descriptor.fileFor(BtiFormat.Components.DATA).length()));
  
          long recordSize = statsMetadata.estimatedPartitionSize.percentile(ioOptions.diskOptimizationEstimatePercentile);
          int bufferSize = ioOptions.diskOptimizationStrategy.bufferSize(recordSize);
  
          if (dataFileBuilder == null)
              dataFileBuilder = new FileHandle.Builder(descriptor.fileFor(BtiFormat.Components.DATA));
  
          dataFileBuilder.bufferSize(bufferSize);
          dataFileBuilder.withChunkCache(chunkCache);
          dataFileBuilder.mmapped(ioOptions.defaultDiskAccessMode);
  
          return dataFileBuilder;
      }
  }
  