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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      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 benchmarks;
     18 
     19 import com.google.caliper.Param;
     20 import java.lang.reflect.Array;
     21 import java.lang.reflect.Constructor;
     22 import java.util.Arrays;
     23 
     24 public class DeepArrayOpsBenchmark {
     25     @Param({"1", "4", "16", "256", "2048"}) int arrayLength;
     26 
     27     private Object[] array;
     28     private Object[] array2;
     29 
     30     private Object[] array3;
     31     private Object[] array4;
     32 
     33     protected void setUp() throws Exception {
     34         array = new Object[arrayLength * 13];
     35         array2 = new Object[arrayLength * 13];
     36         for (int i = 0; i < arrayLength; i += 13) {
     37             array[i] = new IntWrapper(i);
     38             array2[i] = new IntWrapper(i);
     39 
     40             array[i + 1] = new16ElementObjectarray();
     41             array2[i + 1] = new16ElementObjectarray();
     42 
     43             array[i + 2] = new boolean[16];
     44             array2[i + 2] = new boolean[16];
     45 
     46             array[i + 3] = new byte[16];
     47             array2[i + 3] = new byte[16];
     48 
     49             array[i + 4] = new char[16];
     50             array2[i + 4] = new char[16];
     51 
     52             array[i + 5] = new short[16];
     53             array2[i + 5] = new short[16];
     54 
     55             array[i + 6] = new float[16];
     56             array2[i + 6] = new float[16];
     57 
     58             array[i + 7] = new long[16];
     59             array2[i + 7] = new long[16];
     60 
     61             array[i + 8] = new int[16];
     62             array2[i + 8] = new int[16];
     63 
     64             array[i + 9] = new double[16];
     65             array2[i + 9] = new double[16];
     66 
     67             // Subarray types are concrete objects.
     68             array[i + 10] = new16ElementArray(String.class, String.class);
     69             array2[i + 10] = new16ElementArray(String.class, String.class);
     70 
     71             array[i + 11] = new16ElementArray(Integer.class, Integer.class);
     72             array2[i + 11] = new16ElementArray(Integer.class, Integer.class);
     73 
     74             // Subarray types is an interface.
     75             array[i + 12] = new16ElementArray(CharSequence.class, String.class);
     76             array2[i + 12] = new16ElementArray(CharSequence.class, String.class);
     77         }
     78     }
     79 
     80     public void timeDeepHashCode(int reps) {
     81         for (int i = 0; i < reps; ++i) {
     82             Arrays.deepHashCode(array);
     83         }
     84     }
     85 
     86     public void timeEquals(int reps) {
     87         for (int i = 0; i < reps; ++i) {
     88             Arrays.deepEquals(array, array2);
     89         }
     90     }
     91 
     92     private static final Object[] new16ElementObjectarray() {
     93         Object[] array = new Object[16];
     94         for (int i = 0; i < 16; ++i) {
     95             array[i] = new IntWrapper(i);
     96         }
     97 
     98         return array;
     99     }
    100 
    101     @SuppressWarnings("unchecked")
    102     private static final <T, V> T[] new16ElementArray(Class<T> arrayType, Class<V> type)
    103             throws Exception {
    104         T[] array = (T []) Array.newInstance(type, 16);
    105         if (!arrayType.isAssignableFrom(type)) {
    106             throw new IllegalArgumentException(arrayType + " is not assignable from " + type);
    107         }
    108 
    109         Constructor<V> constructor = type.getDeclaredConstructor(String.class);
    110         for (int i = 0; i < 16; ++i) {
    111             array[i] = (T) constructor.newInstance(String.valueOf(i + 1000));
    112         }
    113 
    114         return array;
    115     }
    116 
    117     /**
    118      * A class that provides very basic equals() and hashCode() operations
    119      * and doesn't resort to memoization tricks like {@link java.lang.Integer}.
    120      *
    121      * Useful for providing equal objects that aren't the same (a.equals(b) but
    122      * a != b).
    123      */
    124     public static final class IntWrapper {
    125         private final int wrapped;
    126 
    127         public IntWrapper(int wrap) {
    128             wrapped = wrap;
    129         }
    130 
    131         @Override
    132         public int hashCode() {
    133             return wrapped;
    134         }
    135 
    136         @Override
    137         public boolean equals(Object o) {
    138             if (!(o instanceof IntWrapper)) {
    139                 return false;
    140             }
    141 
    142             return ((IntWrapper) o).wrapped == this.wrapped;
    143         }
    144     }
    145 }
    146 
    147