content: /*
   * 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, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  package org.apache.bifromq.basekv.localengine.rocksdb;
  
  import org.apache.bifromq.basekv.localengine.metrics.KVSpaceMeters;
  import org.apache.bifromq.basekv.localengine.rocksdb.metrics.RocksDBKVSpaceMetric;
  import io.micrometer.core.instrument.Gauge;
  import io.micrometer.core.instrument.Tags;
  import java.util.concurrent.atomic.AtomicInteger;
  
  class RocksDBKVSpaceCompactionTrigger implements IWriteStatsRecorder {
      private final AtomicInteger totalKeyCount = new AtomicInteger();
      private final AtomicInteger totalTombstoneKeyCount = new AtomicInteger();
      private final AtomicInteger totalTombstoneRangeCount = new AtomicInteger();
      private final int minTombstoneKeysTrigger;
      private final int minTombstoneRangesTrigger;
      private final double minTombstoneKeysRatioTrigger;
      private final Runnable compactionScheduler;
      private final Gauge totalKeysGauge;
      private final Gauge totalTombstoneKeysGauge;
      private final Gauge totalTombstoneRangesGauge;
  
      public RocksDBKVSpaceCompactionTrigger(String id,
                                             int minTombstoneKeysTrigger,
                                             int minTombstoneRangesTrigger,
                                             double minTombstoneKeysRatioTrigger,
                                             Runnable compactionScheduler,
                                             String... tags) {
          this.minTombstoneKeysTrigger = minTombstoneKeysTrigger;
          this.minTombstoneRangesTrigger = minTombstoneRangesTrigger;
          this.minTombstoneKeysRatioTrigger = minTombstoneKeysRatioTrigger;
          this.compactionScheduler = compactionScheduler;
          Tags metricTags = Tags.of(tags);
          totalKeysGauge = KVSpaceMeters
              .getGauge(id, RocksDBKVSpaceMetric.TotalKeysGauge, totalKeyCount::get, metricTags);
          totalTombstoneKeysGauge =
              KVSpaceMeters.getGauge(id, RocksDBKVSpaceMetric.TotalTombstoneKeysGauge, totalTombstoneKeyCount::get,
                  metricTags);
          totalTombstoneRangesGauge =
              KVSpaceMeters.getGauge(id, RocksDBKVSpaceMetric.TotalTombstoneRangesGauge, totalTombstoneRangeCount::get,
                  metricTags);
      }
  
      public IRecorder newRecorder() {
          return new WriteStatsRecorder();
      }
  
      public void reset() {
          totalKeyCount.set(0);
          totalTombstoneKeyCount.set(0);
          totalTombstoneRangeCount.set(0);
      }
  
      public interface CompactionScheduler {
          boolean schedule();
      }
  
      class WriteStatsRecorder implements IRecorder {
          private final AtomicInteger keyCount = new AtomicInteger();
          private final AtomicInteger tombstoneKeyCount = new AtomicInteger();
          private final AtomicInteger tombstoneRangeCount = new AtomicInteger();
  
  
          public void recordPut() {
              keyCount.incrementAndGet();
              tombstoneKeyCount.incrementAndGet();
          }
  
          public void recordInsert() {
              keyCount.incrementAndGet();
          }
  
          public void recordDelete() {
              tombstoneKeyCount.incrementAndGet();
          }
  
          public void recordDeleteRange() {
              tombstoneRangeCount.incrementAndGet();
          }
  
          public void stop() {
              int totalKeys = totalKeyCount.addAndGet(keyCount.get());
              int totalTombstones = totalTombstoneKeyCount.addAndGet(tombstoneKeyCount.get());
              int totalRangeTombstones = totalTombstoneRangeCount.addAndGet(tombstoneRangeCount.get());
              if (totalRangeTombstones > minTombstoneRangesTrigger || (totalTombstones > minTombstoneKeysTrigger &&
                  (double) totalTombstones / (totalKeys + totalTombstones) >= minTombstoneKeysRatioTrigger)) {
                  compactionScheduler.run();
              }
          }
      }
  }
  