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   * Licensed to the Apache Software Foundation (ASF) under one
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   * distributed with this work for additional information
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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
   *
   * Unless required by applicable law or agreed to in writing, software
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.index.sai.metrics;
  
  import org.junit.Before;
  import org.junit.Test;
  
  import org.apache.cassandra.index.sai.disk.format.Version;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotEquals;
  import static org.junit.Assert.assertNull;
  
  public class IndexGroupMetricsTest extends AbstractMetricsTest
  {
      @Before
      public void setup() throws Exception
      {
          requireNetwork();
  
          startJMXServer();
  
          createMBeanServerConnection();
      }
  
      @Test
      public void verifyIndexGroupMetrics() throws Throwable
      {
          // create first index
          createTable(CREATE_TABLE_TEMPLATE);
          String v1IndexName = createIndex(String.format(CREATE_INDEX_TEMPLATE, "v1"));
  
          // no open files
          assertEquals(0, getOpenIndexFiles());
          assertEquals(0, getDiskUsage());
  
          int sstables = 10;
          for (int i = 0; i < sstables; i++)
          {
              execute("INSERT INTO %s (id1, v1) VALUES ('0', 0)");
              flush();
          }
  
          // with 10 sstable
          int indexopenFileCountWithOnlyNumeric = getOpenIndexFiles();
          assertEquals(sstables * (Version.LATEST.onDiskFormat().openFilesPerSSTableIndex(false) +
                                   Version.LATEST.onDiskFormat().openFilesPerColumnIndex()),
                       indexopenFileCountWithOnlyNumeric);
  
          long diskUsageWithOnlyNumeric = getDiskUsage();
          assertNotEquals(0, diskUsageWithOnlyNumeric);
  
          // compaction should reduce open files
          compact();
  
          assertEquals(Version.LATEST.onDiskFormat().openFilesPerSSTableIndex(false) +
                       Version.LATEST.onDiskFormat().openFilesPerColumnIndex(),
                       getOpenIndexFiles());
  
          // drop last index, no open index files
          dropIndex("DROP INDEX %s." + v1IndexName);
          assertNull(getCurrentIndexGroup());
      }
  
      protected int getOpenIndexFiles()
      {
          return (int) getMetricValue(objectNameNoIndex("OpenIndexFiles", KEYSPACE, currentTable(), "IndexGroupMetrics"));
      }
  
      protected long getDiskUsage()
      {
          return (long) getMetricValue(objectNameNoIndex("DiskUsedBytes", KEYSPACE, currentTable(), "IndexGroupMetrics"));
      }
  }
  