| /* |
| * 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.utils; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.apache.cassandra.db.BufferDecoratedKey; |
| import org.apache.cassandra.db.CachedHashDecoratedKey; |
| import org.apache.cassandra.dht.Murmur3Partitioner.LongToken; |
| import org.apache.cassandra.utils.IFilter.FilterKey; |
| |
| public class FilterTestHelper |
| { |
| // used by filter subclass tests |
| |
| static final double MAX_FAILURE_RATE = 0.1; |
| public static final BloomCalculations.BloomSpecification spec = BloomCalculations.computeBloomSpec(15, MAX_FAILURE_RATE); |
| static final int ELEMENTS = 10000; |
| |
| static final FilterKey bytes(String s) |
| { |
| return new BufferDecoratedKey(new LongToken(0L), ByteBufferUtil.bytes(s)); |
| } |
| |
| static final FilterKey wrap(ByteBuffer buf) |
| { |
| return new BufferDecoratedKey(new LongToken(0L), buf); |
| } |
| |
| static final FilterKey wrapCached(ByteBuffer buf) |
| { |
| return new CachedHashDecoratedKey(new LongToken(0L), buf); |
| } |
| |
| static final ResetableIterator<ByteBuffer> intKeys() |
| { |
| return new KeyGenerator.IntGenerator(ELEMENTS); |
| } |
| |
| static final ResetableIterator<ByteBuffer> randomKeys() |
| { |
| return new KeyGenerator.RandomStringGenerator(314159, ELEMENTS); |
| } |
| |
| static final ResetableIterator<ByteBuffer> randomKeys2() |
| { |
| return new KeyGenerator.RandomStringGenerator(271828, ELEMENTS); |
| } |
| |
| public static double testFalsePositives(IFilter f, ResetableIterator<ByteBuffer> keys, ResetableIterator<ByteBuffer> otherkeys) |
| { |
| assert keys.size() == otherkeys.size(); |
| |
| while (keys.hasNext()) |
| { |
| f.add(wrap(keys.next())); |
| } |
| |
| int fp = 0; |
| while (otherkeys.hasNext()) |
| { |
| if (f.isPresent(wrap(otherkeys.next()))) |
| { |
| fp++; |
| } |
| } |
| |
| double fp_ratio = fp / (keys.size() * BloomCalculations.probs[spec.bucketsPerElement][spec.K]); |
| assert fp_ratio < 1.03 : fp_ratio; |
| return fp_ratio; |
| } |
| |
| public void testTrue() |
| { |
| assert true; |
| } |
| |
| } |