| /* |
| * 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; |
| |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| public class BloomFilterTracker |
| { |
| private final AtomicLong falsePositiveCount = new AtomicLong(0); |
| private final AtomicLong truePositiveCount = new AtomicLong(0); |
| private long lastFalsePositiveCount = 0L; |
| private long lastTruePositiveCount = 0L; |
| |
| public void addFalsePositive() |
| { |
| falsePositiveCount.incrementAndGet(); |
| } |
| |
| public void addTruePositive() |
| { |
| truePositiveCount.incrementAndGet(); |
| } |
| |
| public long getFalsePositiveCount() |
| { |
| return falsePositiveCount.get(); |
| } |
| |
| public long getRecentFalsePositiveCount() |
| { |
| long fpc = getFalsePositiveCount(); |
| try |
| { |
| return (fpc - lastFalsePositiveCount); |
| } |
| finally |
| { |
| lastFalsePositiveCount = fpc; |
| } |
| } |
| |
| public long getTruePositiveCount() |
| { |
| return truePositiveCount.get(); |
| } |
| |
| public long getRecentTruePositiveCount() |
| { |
| long tpc = getTruePositiveCount(); |
| try |
| { |
| return (tpc - lastTruePositiveCount); |
| } |
| finally |
| { |
| lastTruePositiveCount = tpc; |
| } |
| } |
| } |