cassandra-trunk/test/unit/org/apache/cassandra/io/sstable/filter/BloomFilterTrackerTest.java
/*
 * 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 org.junit.Test;

import static org.junit.Assert.assertEquals;

public class BloomFilterTrackerTest
{
    @Test
    public void testAddingFalsePositives()
    {
        BloomFilterTracker bft = new BloomFilterTracker();
        assertEquals(0L, bft.getFalsePositiveCount());
        assertEquals(0L, bft.getRecentFalsePositiveCount());
        bft.addFalsePositive();
        bft.addFalsePositive();
        assertEquals(2L, bft.getFalsePositiveCount());
        assertEquals(2L, bft.getRecentFalsePositiveCount());
        assertEquals(0L, bft.getRecentFalsePositiveCount());
        assertEquals(2L, bft.getFalsePositiveCount()); // sanity check
    }

    @Test
    public void testAddingTruePositives()
    {
        BloomFilterTracker bft = new BloomFilterTracker();
        assertEquals(0L, bft.getTruePositiveCount());
        assertEquals(0L, bft.getRecentTruePositiveCount());
        bft.addTruePositive();
        bft.addTruePositive();
        assertEquals(2L, bft.getTruePositiveCount());
        assertEquals(2L, bft.getRecentTruePositiveCount());
        assertEquals(0L, bft.getRecentTruePositiveCount());
        assertEquals(2L, bft.getTruePositiveCount()); // sanity check
    }

    @Test
    public void testAddingToOneLeavesTheOtherAlone()
    {
        BloomFilterTracker bft = new BloomFilterTracker();
        bft.addFalsePositive();
        assertEquals(0L, bft.getTruePositiveCount());
        assertEquals(0L, bft.getRecentTruePositiveCount());
        bft.addTruePositive();
        assertEquals(1L, bft.getFalsePositiveCount());
        assertEquals(1L, bft.getRecentFalsePositiveCount());
    }
}
