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/** @file
Milestones
@section license License
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 "ts/apidefs.h"
#include "tscore/ink_platform.h"
#include "tscore/ink_hrtime.h"
#include "I_EventSystem.h"
template <class T, size_t entries> class Milestones
{
public:
ink_hrtime &
operator[](T ms)
{
return this->_milestones[static_cast<size_t>(ms)];
}
ink_hrtime
operator[](T ms) const
{
return this->_milestones[static_cast<size_t>(ms)];
}
/**
* Mark given milestone with timestamp if it's not marked yet
* @param ms The milestone to mark
* @return N/A
*/
void
mark(T ms)
{
if (this->_milestones[static_cast<size_t>(ms)] == 0) {
this->_milestones[static_cast<size_t>(ms)] = ink_get_hrtime();
}
}
/**
* Takes two milestones and returns the difference.
* @param start The start time
* @param end The end time
* @return The difference time in milliseconds
*/
int64_t
difference_msec(T ms_start, T ms_end, int64_t missing = -1) const // Return "missing" when Milestone is not set
{
if (this->_milestones[static_cast<size_t>(ms_end)] == 0) {
return missing;
}
return ink_hrtime_to_msec(this->_milestones[static_cast<size_t>(ms_end)] - this->_milestones[static_cast<size_t>(ms_start)]);
}
/**
* Takes two milestones and returns the difference.
* @param start The start time
* @param end The end time
* @return A double that is the difference time in seconds
*/
double
difference_sec(T ms_start, T ms_end) const
{
return static_cast<double>(difference_msec(ms_start, ms_end) / 1000.0);
}
/**
* Takes two milestones and returns the difference.
* @param start The start time
* @param end The end time
* @return The difference time in high-resolution time
*/
ink_hrtime
elapsed(T ms_start, T ms_end) const
{
return this->_milestones[static_cast<size_t>(ms_end)] - this->_milestones[static_cast<size_t>(ms_start)];
}
private:
std::array<ink_hrtime, entries> _milestones = {{0}};
};
// For compatibility with HttpSM.h and HttpTransact.h
using TransactionMilestones = Milestones<TSMilestonesType, TS_MILESTONE_LAST_ENTRY>;
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