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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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.metrics;
  
  import com.codahale.metrics.Counter;
  import com.codahale.metrics.Gauge;
  import com.codahale.metrics.Histogram;
  import com.codahale.metrics.Timer;
  import org.apache.cassandra.index.sai.StorageAttachedIndex;
  import org.apache.cassandra.index.sai.memory.MemtableIndexManager;
  
  import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics;
  
  public class IndexMetrics extends AbstractMetrics
  {
      public final Timer memtableIndexWriteLatency;
  
      public final Counter memtableIndexFlushCount;
      public final Counter compactionCount;
      public final Counter memtableIndexFlushErrors;
      public final Counter segmentFlushErrors;
  
      public final Histogram memtableFlushCellsPerSecond;
      public final Histogram segmentsPerCompaction;
      public final Histogram compactionSegmentCellsPerSecond;
      public final Histogram compactionSegmentBytesPerSecond;
  
      public IndexMetrics(StorageAttachedIndex index, MemtableIndexManager memtableIndexManager)
      {
          super(index.identifier(), "IndexMetrics");
  
          memtableIndexWriteLatency = Metrics.timer(createMetricName("MemtableIndexWriteLatency"));
          compactionSegmentCellsPerSecond = Metrics.histogram(createMetricName("CompactionSegmentCellsPerSecond"), false);
          compactionSegmentBytesPerSecond = Metrics.histogram(createMetricName("CompactionSegmentBytesPerSecond"), false);
          memtableFlushCellsPerSecond = Metrics.histogram(createMetricName("MemtableIndexFlushCellsPerSecond"), false);
          segmentsPerCompaction = Metrics.histogram(createMetricName("SegmentsPerCompaction"), false);
          memtableIndexFlushCount = Metrics.counter(createMetricName("MemtableIndexFlushCount"));
          compactionCount = Metrics.counter(createMetricName("CompactionCount"));
          memtableIndexFlushErrors = Metrics.counter(createMetricName("MemtableIndexFlushErrors"));
          segmentFlushErrors = Metrics.counter(createMetricName("CompactionSegmentFlushErrors"));
          Metrics.register(createMetricName("SSTableCellCount"), (Gauge<Long>) index::cellCount);
          Metrics.register(createMetricName("LiveMemtableIndexWriteCount"), (Gauge<Long>) memtableIndexManager::liveMemtableWriteCount);
          Metrics.register(createMetricName("MemtableIndexBytes"), (Gauge<Long>) memtableIndexManager::estimatedMemIndexMemoryUsed);
          Metrics.register(createMetricName("DiskUsedBytes"), (Gauge<Long>) index::diskUsage);
          Metrics.register(createMetricName("IndexFileCacheBytes"), (Gauge<Long>) index::indexFileCacheSize);
      }
  }
  