| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #pragma once |
| |
| #include <atomic> |
| #include <cassert> |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include "rocketmq/RocketMQ.h" |
| |
| ROCKETMQ_NAMESPACE_BEGIN |
| |
| class Histogram { |
| public: |
| Histogram(std::string title, int32_t capacity) : title_(std::move(title)), capacity_(capacity) { |
| data_.reserve(capacity); |
| for (int i = 0; i < capacity_; ++i) { |
| data_.push_back(std::unique_ptr<std::atomic<int32_t>>(new std::atomic<int32_t>(0))); |
| } |
| } |
| |
| void countIn(int grade) { |
| if (grade < 0) { |
| return; |
| } |
| |
| if (grade >= capacity_) { |
| data_[capacity_ - 1]->fetch_add(1, std::memory_order_relaxed); |
| return; |
| } |
| |
| data_[grade]->fetch_add(1, std::memory_order_relaxed); |
| } |
| |
| /** |
| * Change labels of histogram duration the initialization phase only. |
| * @return |
| */ |
| std::vector<std::string>& labels() { |
| return labels_; |
| } |
| |
| void reportAndReset(std::string& result) { |
| assert(labels_.size() == static_cast<std::vector<std::string>::size_type>(capacity_)); |
| std::vector<int32_t> values; |
| values.reserve(capacity_); |
| for (auto& item : data_) { |
| int value = item->load(std::memory_order_relaxed); |
| values.push_back(value); |
| item->fetch_sub(value, std::memory_order_relaxed); |
| } |
| result.clear(); |
| result.append(title_).append(":"); |
| for (std::vector<std::string>::size_type i = 0; i < labels_.size(); ++i) { |
| if (i) { |
| result.append(", "); |
| } |
| result.append(labels_[i]).append(std::to_string(values[i])); |
| } |
| } |
| |
| private: |
| std::string title_; |
| std::vector<std::unique_ptr<std::atomic<int32_t>>> data_; |
| int32_t capacity_; |
| std::vector<std::string> labels_; |
| }; |
| |
| ROCKETMQ_NAMESPACE_END |