1 /* 2 * Copyright (C) 2008 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 import java.io.Serializable; 18 import java.util.ArrayList; 19 import java.util.Arrays; 20 import java.util.HashSet; 21 import java.util.List; 22 import java.util.Set; 23 24 /** 25 * A loaded class. 26 */ 27 class LoadedClass implements Serializable, Comparable<LoadedClass> { 28 29 private static final long serialVersionUID = 0; 30 31 /** Class name. */ 32 final String name; 33 34 /** Load operations. */ 35 final List<Operation> loads = new ArrayList<Operation>(); 36 37 /** Static initialization operations. */ 38 final List<Operation> initializations = new ArrayList<Operation>(); 39 40 /** Memory usage gathered by loading only this class in its own VM. */ 41 MemoryUsage memoryUsage = MemoryUsage.NOT_AVAILABLE; 42 43 /** 44 * Whether or not this class was loaded in the system class loader. 45 */ 46 final boolean systemClass; 47 48 /** Whether or not this class will be preloaded. */ 49 boolean preloaded; 50 51 /** Constructs a new class. */ LoadedClass(String name, boolean systemClass)52 LoadedClass(String name, boolean systemClass) { 53 this.name = name; 54 this.systemClass = systemClass; 55 } 56 57 /** 58 * Returns true if this class was loaded by more than one proc. 59 */ isSharable()60 boolean isSharable() { 61 Set<String> procNames = new HashSet<String>(); 62 for (Operation load : loads) { 63 if (load.process.fromZygote()) { 64 procNames.add(load.process.name); 65 if (procNames.size() > 1) { 66 return true; 67 } 68 } 69 } 70 for (Operation init : initializations) { 71 if (init.process.fromZygote()) { 72 procNames.add(init.process.name); 73 if (procNames.size() > 1) { 74 return true; 75 } 76 } 77 } 78 return false; 79 } 80 measureMemoryUsage()81 void measureMemoryUsage() { 82 this.memoryUsage = MemoryUsage.forClass(name); 83 } 84 85 int mlt = -1; 86 87 /** Median time to load this class. */ medianLoadTimeMicros()88 int medianLoadTimeMicros() { 89 if (mlt != -1) { 90 return mlt; 91 } 92 93 return mlt = calculateMedian(loads); 94 } 95 96 int mit = -1; 97 98 /** Median time to initialize this class. */ medianInitTimeMicros()99 int medianInitTimeMicros() { 100 if (mit != -1) { 101 return mit; 102 } 103 104 return mit = calculateMedian(initializations); 105 } 106 medianTimeMicros()107 int medianTimeMicros() { 108 return medianInitTimeMicros() + medianLoadTimeMicros(); 109 } 110 111 /** Calculates the median duration for a list of operations. */ calculateMedian(List<Operation> operations)112 private static int calculateMedian(List<Operation> operations) { 113 int size = operations.size(); 114 if (size == 0) { 115 return 0; 116 } 117 118 int[] times = new int[size]; 119 for (int i = 0; i < size; i++) { 120 times[i] = operations.get(i).exclusiveTimeMicros(); 121 } 122 123 Arrays.sort(times); 124 int middle = size / 2; 125 if (size % 2 == 1) { 126 // Odd 127 return times[middle]; 128 } else { 129 // Even -- average the two. 130 return (times[middle - 1] + times[middle]) / 2; 131 } 132 } 133 134 /** Returns names of processes that loaded this class. */ processNames()135 Set<String> processNames() { 136 Set<String> names = new HashSet<String>(); 137 addProcessNames(loads, names); 138 addProcessNames(initializations, names); 139 return names; 140 } 141 addProcessNames(List<Operation> ops, Set<String> names)142 private void addProcessNames(List<Operation> ops, Set<String> names) { 143 for (Operation operation : ops) { 144 if (operation.process.fromZygote()) { 145 names.add(operation.process.name); 146 } 147 } 148 } 149 compareTo(LoadedClass o)150 public int compareTo(LoadedClass o) { 151 return name.compareTo(o.name); 152 } 153 154 @Override toString()155 public String toString() { 156 return name; 157 } 158 } 159