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