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Histogram.h
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85 lines (74 loc) · 2.44 KB
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/*
* 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