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   * "License"); you may not use this file except in compliance
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   *
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  package org.apache.cassandra.index.sai.functional;
  
  import java.util.Collection;
  import java.util.Set;
  import java.util.stream.Collectors;
  
  import com.google.common.collect.Iterables;
  import org.junit.Assert;
  import org.junit.Test;
  
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.db.marshal.UTF8Type;
  import org.apache.cassandra.index.sai.SAITester;
  import org.apache.cassandra.index.sai.StorageAttachedIndex;
  import org.apache.cassandra.index.sai.StorageAttachedIndexGroup;
  import org.apache.cassandra.index.sai.disk.format.Version;
  import org.apache.cassandra.index.sai.utils.IndexTermType;
  import org.apache.cassandra.io.sstable.Component;
  import org.apache.cassandra.io.sstable.format.SSTableReader;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  
  public class GroupComponentsTest extends SAITester
  {
      @Test
      public void testInvalidateWithoutObsolete()
      {
          createTable("CREATE TABLE %s (pk int primary key, value text)");
          createIndex("CREATE INDEX ON %s(value) USING 'sai'");
          execute("INSERT INTO %s (pk) VALUES (1)");
          flush();
  
          ColumnFamilyStore cfs = getCurrentColumnFamilyStore();
          StorageAttachedIndexGroup group = StorageAttachedIndexGroup.getIndexGroup(cfs);
          assertNotNull(group);
  
          StorageAttachedIndex index = (StorageAttachedIndex) group.getIndexes().iterator().next();
          SSTableReader sstable = Iterables.getOnlyElement(cfs.getLiveSSTables());
  
          Set<Component> components = StorageAttachedIndexGroup.getLiveComponents(sstable, getIndexesFromGroup(group));
          assertEquals(Version.LATEST.onDiskFormat().perSSTableIndexComponents(false).size() + 1, components.size());
  
          // index files are released but not removed
          cfs.invalidate(true, false);
          Assert.assertTrue(index.view().getIndexes().isEmpty());
          for (Component component : components)
              Assert.assertTrue(sstable.descriptor.fileFor(component).exists());
      }
  
      @Test
      public void getLiveComponentsForEmptyIndex()
      {
          createTable("CREATE TABLE %s (pk int primary key, value text)");
          createIndex("CREATE INDEX ON %s(value) USING 'sai'");
          execute("INSERT INTO %s (pk) VALUES (1)");
          flush();
  
          ColumnFamilyStore cfs = getCurrentColumnFamilyStore();
          StorageAttachedIndexGroup group = StorageAttachedIndexGroup.getIndexGroup(cfs);
          assertNotNull(group);
  
          Set<SSTableReader> sstables = cfs.getLiveSSTables();
  
          assertEquals(1, sstables.size());
  
          Set<Component> components = StorageAttachedIndexGroup.getLiveComponents(sstables.iterator().next(), getIndexesFromGroup(group));
  
          assertEquals(Version.LATEST.onDiskFormat().perSSTableIndexComponents(false).size() + 1, components.size());
      }
  
      @Test
      public void getLiveComponentsForPopulatedIndex()
      {
          createTable("CREATE TABLE %s (pk int primary key, value text)");
  
          createIndex("CREATE INDEX ON %s(value) USING 'sai'");
          IndexTermType indexTermType = createIndexTermType(UTF8Type.instance);
  
          execute("INSERT INTO %s (pk, value) VALUES (1, '1')");
          flush();
  
          ColumnFamilyStore cfs = getCurrentColumnFamilyStore();
          StorageAttachedIndexGroup group = StorageAttachedIndexGroup.getIndexGroup(cfs);
          assertNotNull(group);
  
          Set<SSTableReader> sstables = cfs.getLiveSSTables();
  
          assertEquals(1, sstables.size());
  
          Set<Component> components = StorageAttachedIndexGroup.getLiveComponents(sstables.iterator().next(), getIndexesFromGroup(group));
  
          assertEquals(Version.LATEST.onDiskFormat().perSSTableIndexComponents(false).size() +
                       Version.LATEST.onDiskFormat().perColumnIndexComponents(indexTermType).size(),
                       components.size());
      }
  
      private Collection<StorageAttachedIndex> getIndexesFromGroup(StorageAttachedIndexGroup group)
      {
          return group.getIndexes().stream().map(index -> (StorageAttachedIndex)index).collect(Collectors.toList());
      }
  }
  