org.apache.cassandra.io.sstable.BloomFilterTracker Maven / Gradle / Ivy
/*
* 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;
}
}
}