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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.index.sai.cql;
  
  import org.junit.Test;
  
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.db.lifecycle.Tracker;
  import org.apache.cassandra.index.sai.SAITester;
  import org.apache.cassandra.index.sai.StorageAttachedIndexGroup;
  
  import static java.lang.String.format;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotSame;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertTrue;
  
  public class IndexGroupLifecycleTest extends SAITester
  {
      @Test
      public void testDropAndRecreate() throws Throwable
      {
          createTable("CREATE TABLE %s (pk text, value text, PRIMARY KEY (pk))");
          populateOneSSTable();
  
          ColumnFamilyStore cfs = getCurrentColumnFamilyStore();
          cfs.disableAutoCompaction();
          Tracker tracker = cfs.getTracker();
  
          // create index and drop it: StorageAttachedIndexGroup should be removed
          createIndex("CREATE CUSTOM INDEX sai ON %s(value) USING 'StorageAttachedIndex'");
  
          StorageAttachedIndexGroup group = (StorageAttachedIndexGroup) cfs.indexManager.getIndexGroup(StorageAttachedIndexGroup.GROUP_KEY);
          assertTrue(tracker.contains(group));
          assertEquals(1, group.sstableContextManager().size());
  
          dropIndex(format("DROP INDEX %s.sai", KEYSPACE));
          assertFalse(tracker.contains(group));
          assertEquals(0, group.sstableContextManager().size()); // sstable should be cleared from old group
          assertNull(cfs.indexManager.getIndexGroup(StorageAttachedIndexGroup.GROUP_KEY));
  
          // populate 2nd sstable. Old group should not track it
          populateOneSSTable();
          assertEquals(0, group.sstableContextManager().size());
  
          // create index again: expect a new StorageAttachedIndexGroup to be registered into tracker
          createIndex("CREATE CUSTOM INDEX sai ON %s(value) USING 'StorageAttachedIndex'");
  
          StorageAttachedIndexGroup newGroup = (StorageAttachedIndexGroup) cfs.indexManager.getIndexGroup(StorageAttachedIndexGroup.GROUP_KEY);
          assertNotSame(group, newGroup);
          assertTrue(tracker.contains(newGroup));
          assertEquals(2, newGroup.sstableContextManager().size());
  
          // populate 3rd sstable. new group should  track it
          populateOneSSTable();
          assertEquals(3, newGroup.sstableContextManager().size());
      }
  
      private void populateOneSSTable()
      {
          execute("INSERT INTO %s(pk, value) VALUES('k', 'v')");
          flush();
      }
  }