/*
* Copyright (C) 2011 The Guava Authors
*
* Licensed 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 com.google.common.collect;
import com.google.caliper.BeforeExperiment;
import com.google.caliper.Benchmark;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
/**
* Benchmark for HashMultiset.add for an already-present element.
*
* @author Louis Wasserman
*/
public class HashMultisetAddPresentBenchmark {
private static final int ARRAY_MASK = 0x0ffff;
private static final int ARRAY_SIZE = 0x10000;
List<Multiset<Integer>> multisets = new ArrayList<Multiset<Integer>>(0x10000);
int[] queries = new int[ARRAY_SIZE];
@BeforeExperiment
void setUp() {
Random random = new Random();
multisets.clear();
for (int i = 0; i < ARRAY_SIZE; i++) {
HashMultiset<Integer> multiset = HashMultiset.<Integer>create();
multisets.add(multiset);
queries[i] = random.nextInt();
multiset.add(queries[i]);
}
}
@Benchmark int add(int reps) {
int tmp = 0;
for (int i = 0; i < reps; i++) {
int j = i & ARRAY_MASK;
tmp += multisets.get(j).add(queries[j], 4);
}
return tmp;
}
}