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   * Licensed to the Apache Software Foundation (ASF) under one
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   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
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   *
   *     http://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.cassandra.index.sai.utils;
  
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import com.carrotsearch.randomizedtesting.rules.TestRuleAdapter;
  import org.apache.cassandra.index.sai.disk.format.IndexDescriptor;
  import org.apache.cassandra.index.sai.disk.io.TrackingIndexFileUtils;
  import org.apache.cassandra.io.sstable.Descriptor;
  import org.apache.cassandra.io.util.SequentialWriterOption;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.lucene.store.IndexInput;
  
  import static org.junit.Assert.assertTrue;
  
  public class IndexInputLeakDetector extends TestRuleAdapter
  {
      private final static Set<TrackingIndexFileUtils> trackedIndexFileUtils = Collections.synchronizedSet(new HashSet<>());
  
      public IndexDescriptor newIndexDescriptor(Descriptor descriptor, TableMetadata tableMetadata, SequentialWriterOption sequentialWriterOption)
      {
          TrackingIndexFileUtils trackingIndexFileUtils = new TrackingIndexFileUtils(sequentialWriterOption);
          trackedIndexFileUtils.add(trackingIndexFileUtils);
          return IndexDescriptor.create(descriptor, tableMetadata.partitioner, tableMetadata.comparator);
      }
  
      @Override
      protected void afterIfSuccessful()
      {
          for (TrackingIndexFileUtils fileUtils : trackedIndexFileUtils)
          {
              final Map<IndexInput, String> openInputs = fileUtils.getOpenInputs();
              assertTrue("Index components have open inputs: " + openInputs, openInputs.isEmpty());
          }
      }
  
      @Override
      protected void afterAlways(List<Throwable> errors)
      {
          trackedIndexFileUtils.clear();
      }
  }
  