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Rearrange sources (#4997)

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2024-06-20 09:22:15 -05:00
committed by John Freeman
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commit e416ee72ca
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include/xrpl/beast/asio/io_latency_probe.h Normal file
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//------------------------------------------------------------------------------
/*
This file is part of Beast: https://github.com/vinniefalco/Beast
Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
#ifndef BEAST_ASIO_IO_LATENCY_PROBE_H_INCLUDED
#define BEAST_ASIO_IO_LATENCY_PROBE_H_INCLUDED
#include <boost/asio/basic_waitable_timer.hpp>
#include <boost/asio/io_service.hpp>
#include <chrono>
#include <condition_variable>
#include <mutex>
#include <stdexcept>
namespace beast {
/** Measures handler latency on an io_service queue. */
template <class Clock>
class io_latency_probe
{
private:
using duration = typename Clock::duration;
using time_point = typename Clock::time_point;
std::recursive_mutex m_mutex;
std::condition_variable_any m_cond;
std::size_t m_count;
duration const m_period;
boost::asio::io_service& m_ios;
boost::asio::basic_waitable_timer<std::chrono::steady_clock> m_timer;
bool m_cancel;
public:
io_latency_probe(duration const& period, boost::asio::io_service& ios)
: m_count(1)
, m_period(period)
, m_ios(ios)
, m_timer(m_ios)
, m_cancel(false)
{
}
~io_latency_probe()
{
std::unique_lock<decltype(m_mutex)> lock(m_mutex);
cancel(lock, true);
}
/** Return the io_service associated with the latency probe. */
/** @{ */
boost::asio::io_service&
get_io_service()
{
return m_ios;
}
boost::asio::io_service const&
get_io_service() const
{
return m_ios;
}
/** @} */
/** Cancel all pending i/o.
Any handlers which have already been queued will still be called.
*/
/** @{ */
void
cancel()
{
std::unique_lock<decltype(m_mutex)> lock(m_mutex);
cancel(lock, true);
}
void
cancel_async()
{
std::unique_lock<decltype(m_mutex)> lock(m_mutex);
cancel(lock, false);
}
/** @} */
/** Measure one sample of i/o latency.
Handler will be called with this signature:
void Handler (Duration d);
*/
template <class Handler>
void
sample_one(Handler&& handler)
{
std::lock_guard lock(m_mutex);
if (m_cancel)
throw std::logic_error("io_latency_probe is canceled");
m_ios.post(sample_op<Handler>(
std::forward<Handler>(handler), Clock::now(), false, this));
}
/** Initiate continuous i/o latency sampling.
Handler will be called with this signature:
void Handler (std::chrono::milliseconds);
*/
template <class Handler>
void
sample(Handler&& handler)
{
std::lock_guard lock(m_mutex);
if (m_cancel)
throw std::logic_error("io_latency_probe is canceled");
m_ios.post(sample_op<Handler>(
std::forward<Handler>(handler), Clock::now(), true, this));
}
private:
void
cancel(std::unique_lock<decltype(m_mutex)>& lock, bool wait)
{
if (!m_cancel)
{
--m_count;
m_cancel = true;
}
if (wait)
m_cond.wait(lock, [this] { return this->m_count == 0; });
}
void
addref()
{
std::lock_guard lock(m_mutex);
++m_count;
}
void
release()
{
std::lock_guard lock(m_mutex);
if (--m_count == 0)
m_cond.notify_all();
}
template <class Handler>
struct sample_op
{
Handler m_handler;
time_point m_start;
bool m_repeat;
io_latency_probe* m_probe;
sample_op(
Handler const& handler,
time_point const& start,
bool repeat,
io_latency_probe* probe)
: m_handler(handler)
, m_start(start)
, m_repeat(repeat)
, m_probe(probe)
{
assert(m_probe);
m_probe->addref();
}
sample_op(sample_op&& from) noexcept
: m_handler(std::move(from.m_handler))
, m_start(from.m_start)
, m_repeat(from.m_repeat)
, m_probe(from.m_probe)
{
assert(m_probe);
from.m_probe = nullptr;
}
sample_op(sample_op const&) = delete;
sample_op
operator=(sample_op const&) = delete;
sample_op&
operator=(sample_op&&) = delete;
~sample_op()
{
if (m_probe)
m_probe->release();
}
void
operator()() const
{
if (!m_probe)
return;
typename Clock::time_point const now(Clock::now());
typename Clock::duration const elapsed(now - m_start);
m_handler(elapsed);
{
std::lock_guard lock(m_probe->m_mutex);
if (m_probe->m_cancel)
return;
}
if (m_repeat)
{
// Calculate when we want to sample again, and
// adjust for the expected latency.
//
typename Clock::time_point const when(
now + m_probe->m_period - 2 * elapsed);
if (when <= now)
{
// The latency is too high to maintain the desired
// period so don't bother with a timer.
//
m_probe->m_ios.post(
sample_op<Handler>(m_handler, now, m_repeat, m_probe));
}
else
{
m_probe->m_timer.expires_from_now(when - now);
m_probe->m_timer.async_wait(
sample_op<Handler>(m_handler, now, m_repeat, m_probe));
}
}
}
void
operator()(boost::system::error_code const& ec)
{
if (!m_probe)
return;
typename Clock::time_point const now(Clock::now());
m_probe->m_ios.post(
sample_op<Handler>(m_handler, now, m_repeat, m_probe));
}
};
};
} // namespace beast
#endif