1/*
2 * Copyright (C) 2012 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.collect;
18
19import com.google.caliper.BeforeExperiment;
20import com.google.caliper.Benchmark;
21import com.google.caliper.Param;
22import com.google.common.collect.BenchmarkHelpers.SetImpl;
23
24/**
25 * This is meant to be used with {@code --measureMemory} to measure the memory
26 * usage of various {@code Set} implementations.
27 *
28 * @author Christopher Swenson
29 */
30public class SetCreationBenchmark {
31  @Param({ "3", "6", "11", "23", "45", "91", "181", "362", "724", "1448",
32      "2896", "5793", "11585", "23170", "46341", "92682", "185364", "370728",
33      "741455", "1482910", "2965821", "5931642"})
34  private int size;
35
36  // "" means no fixed seed
37  @Param("1234")
38  private SpecialRandom random;
39
40  @Param({"Immutable", "Hash"})
41  private SetImpl impl;
42
43  // the following must be set during setUp
44  private CollectionBenchmarkSampleData sampleData;
45
46  @BeforeExperiment void setUp() {
47    sampleData = new CollectionBenchmarkSampleData(true, random, 0.8, size);
48  }
49
50  @Benchmark int creation(int reps) {
51    int x = 0;
52    for (int i = 0; i < reps; i++) {
53      x ^= System.identityHashCode(impl.create(sampleData.getValuesInSet()));
54    }
55    return x;
56  }
57}
58