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.cassandra.io.sstable.filter;
  
  import java.util.concurrent.atomic.AtomicLong;
  import java.util.concurrent.atomic.LongAdder;
  
  public class BloomFilterTracker
  {
      private final LongAdder falsePositiveCount = new LongAdder();
      private final LongAdder truePositiveCount = new LongAdder();
      private final LongAdder trueNegativeCount = new LongAdder();
      private final AtomicLong lastFalsePositiveCount = new AtomicLong();
      private final AtomicLong lastTruePositiveCount = new AtomicLong();
      private final AtomicLong lastTrueNegativeCount = new AtomicLong();
  
      public void addFalsePositive()
      {
          falsePositiveCount.increment();
      }
  
      public void addTruePositive()
      {
          truePositiveCount.increment();
      }
  
      public void addTrueNegative()
      {
          trueNegativeCount.increment();
      }
  
      public long getFalsePositiveCount()
      {
          return falsePositiveCount.sum();
      }
  
      public long getRecentFalsePositiveCount()
      {
          long fpc = getFalsePositiveCount();
          long last = lastFalsePositiveCount.getAndSet(fpc);
          return fpc - last;
      }
  
      public long getTruePositiveCount()
      {
          return truePositiveCount.sum();
      }
  
      public long getRecentTruePositiveCount()
      {
          long tpc = getTruePositiveCount();
          long last = lastTruePositiveCount.getAndSet(tpc);
          return tpc - last;
      }
  
      public long getTrueNegativeCount()
      {
          return trueNegativeCount.sum();
      }
  
      public long getRecentTrueNegativeCount()
      {
          long tnc = getTrueNegativeCount();
          long last = lastTrueNegativeCount.getAndSet(tnc);
          return tnc - last;
      }
  }
  