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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "active_operations_stats.h"
namespace storage {
namespace {
template <typename T>
void update_min_max(T value, std::optional<T>& min, std::optional<T>& max)
{
if (!min.has_value() || value < min.value()) {
min = value;
}
if (!max.has_value() || value > max.value()) {
max = value;
}
}
template <typename T>
void merge_min(std::optional<T>& min, const std::optional<T>& rhs_min)
{
if (!rhs_min.has_value()) {
return;
}
if (min.has_value() && !(rhs_min.value() < min.value())) {
return;
}
min = rhs_min;
}
template <typename T>
void merge_max(std::optional<T>& max, const std::optional<T>& rhs_max)
{
if (!rhs_max.has_value()) {
return;
}
if (max.has_value() && !(rhs_max.value() > max.value())) {
return;
}
max = rhs_max;
}
template <typename T>
void merge_min_max_sum(std::optional<T>& lhs, const std::optional<T>& rhs)
{
if (!rhs.has_value()) {
return;
}
if (lhs.has_value()) {
lhs = lhs.value() + rhs.value();
return;
}
lhs = rhs;
}
}
ActiveOperationsStats::ActiveOperationsStats() noexcept
: _size_samples(0u),
_total_size(0u),
_active_size(0u),
_min_size(),
_max_size(),
_latency_samples(0u),
_total_latency(0.0),
_min_latency(),
_max_latency()
{
}
ActiveOperationsStats::~ActiveOperationsStats() = default;
void
ActiveOperationsStats::update_size() noexcept
{
++_size_samples;
_total_size += _active_size;
update_min_max(_active_size, _min_size, _max_size);
}
ActiveOperationsStats&
ActiveOperationsStats::operator-=(const ActiveOperationsStats& rhs) noexcept
{
_size_samples -= rhs._size_samples;
_total_size -= rhs._total_size;
_latency_samples -= rhs._latency_samples;
_total_latency -= rhs._total_latency;
return *this;
}
void
ActiveOperationsStats::merge(const ActiveOperationsStats& rhs) noexcept
{
_size_samples += rhs._size_samples;
_total_size += rhs._total_size;
_active_size += rhs._active_size;
merge_min_max_sum(_min_size, rhs._min_size);
merge_min_max_sum(_max_size, rhs._max_size);
_latency_samples += rhs._latency_samples;
_total_latency += rhs._total_latency;
merge_min(_min_latency, rhs._min_latency);
merge_max(_max_latency, rhs._max_latency);
}
void
ActiveOperationsStats::operation_started() noexcept
{
++_active_size;
update_size();
}
void
ActiveOperationsStats::operation_done(double latency) noexcept
{
--_active_size;
update_size();
++_latency_samples;
_total_latency += latency;
update_min_max(latency, _min_latency, _max_latency);
}
void
ActiveOperationsStats::reset_min_max() noexcept
{
_min_size.reset();
_max_size.reset();
_min_latency.reset();
_max_latency.reset();
}
}
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