1 /*
2  * Copyright (C) 2010 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 
17 package com.google.common.base;
18 
19 import com.google.caliper.Benchmark;
20 
21 /**
22  * Some microbenchmarks for the {@link com.google.common.base.Objects} class.
23  *
24  * @author Ben L. Titzer
25  */
26 public class ObjectsBenchmark {
27 
28   private static final Integer I0 = -45;
29   private static final Integer I1 = -1;
30   private static final Integer I2 = 3;
31   private static final String S0 = "3";
32   private static final String S1 = "Ninety five";
33   private static final String S2 = "44 one million";
34   private static final String S3 = "Lowly laundry lefties";
35   private static final String S4 = "89273487U#*&#";
36   private static final Double D0 = 9.234d;
37   private static final Double D1 = -1.2e55;
38 
39   @Benchmark
hashString_2(int reps)40   int hashString_2(int reps) {
41     int dummy = 0;
42     for (int i = 0; i < reps; i++) {
43       dummy += Objects.hashCode(S0, S1);
44     }
45     return dummy;
46   }
47 
48   @Benchmark
hashString_3(int reps)49   int hashString_3(int reps) {
50     int dummy = 0;
51     for (int i = 0; i < reps; i++) {
52       dummy += Objects.hashCode(S0, S1, S2);
53     }
54     return dummy;
55   }
56 
57   @Benchmark
hashString_4(int reps)58   int hashString_4(int reps) {
59     int dummy = 0;
60     for (int i = 0; i < reps; i++) {
61       dummy += Objects.hashCode(S0, S1, S2, S3);
62     }
63     return dummy;
64   }
65 
66   @Benchmark
hashString_5(int reps)67   int hashString_5(int reps) {
68     int dummy = 0;
69     for (int i = 0; i < reps; i++) {
70       dummy += Objects.hashCode(S0, S1, S2, S3, S4);
71     }
72     return dummy;
73   }
74 
75   @Benchmark
hashMixed_5(int reps)76   int hashMixed_5(int reps) {
77     int dummy = 0;
78     for (int i = 0; i < reps; i++) {
79       dummy += Objects.hashCode(I2, S1, D1, S2, I0);
80       dummy += Objects.hashCode(D0, I1, S3, I2, S0);
81     }
82     return dummy;
83   }
84 }
85