1 /* 2 * Copyright (C) 2018 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 #ifndef ART_LIBARTBASE_BASE_STATS_H_ 18 #define ART_LIBARTBASE_BASE_STATS_H_ 19 20 #include <unordered_map> 21 22 #include "globals.h" 23 24 namespace art { 25 26 // Simple structure to record tree of statistical values. 27 class Stats { 28 public: Value()29 double Value() const { return value_; } Count()30 size_t Count() const { return count_; } Child(const char * name)31 Stats* Child(const char* name) { return &children_[name]; } Children()32 const std::unordered_map<const char*, Stats>& Children() const { return children_; } 33 34 void AddBytes(double bytes, size_t count = 1) { Add(bytes, count); } 35 void AddBits(double bits, size_t count = 1) { Add(bits / kBitsPerByte, count); } 36 void AddSeconds(double s, size_t count = 1) { Add(s, count); } 37 void AddNanoSeconds(double ns, size_t count = 1) { Add(ns / 1000000000.0, count); } 38 SumChildrenValues()39 double SumChildrenValues() const { 40 double sum = 0.0; 41 for (auto it : children_) { 42 sum += it.second.Value(); 43 } 44 return sum; 45 } 46 47 private: 48 void Add(double value, size_t count = 1) { 49 value_ += value; 50 count_ += count; 51 } 52 53 double value_ = 0.0; // Commutative sum of the collected statistic in basic units. 54 size_t count_ = 0; // The number of samples for this node. 55 std::unordered_map<const char*, Stats> children_; 56 }; 57 58 } // namespace art 59 60 #endif // ART_LIBARTBASE_BASE_STATS_H_ 61