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112 lines
3.0 KiB
C++
112 lines
3.0 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef RIPPLE_ALGORITHM_DISCRETECLOCK_H_INCLUDED
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#define RIPPLE_ALGORITHM_DISCRETECLOCK_H_INCLUDED
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#include "beast/beast/StaticAssert.h"
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#include "beast/beast/type_traits/IsIntegral.h"
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#include "beast/beast/chrono/RelativeTime.h"
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namespace ripple {
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/** Interface for an elapsed time clock that uses integral units. */
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template <typename ElapsedType>
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class DiscreteClock
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{
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public:
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/** Source of time for the discrete clock. */
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class Source
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{
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public:
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typedef ElapsedType elapsed_type;
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typedef DiscreteClock <elapsed_type> DiscreteClockType;
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virtual ElapsedType operator() () = 0;
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};
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/** Integral elapsed time type relative to an unspecified past event. */
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typedef ElapsedType elapsed_type;
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DiscreteClock (Source& source)
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: m_source (source)
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{
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static_bassert (IsIntegral <elapsed_type>::value);
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}
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/** Returns the elapsed time in discrete units.
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The elapsed time is relative to an unspecified event.
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*/
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elapsed_type operator() () const
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{
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return m_source();
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}
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private:
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Source& m_source;
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};
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//------------------------------------------------------------------------------
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/** Seconds-based clock that uses elapsed time from startup as a time source. */
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class SimpleMonotonicClock : public DiscreteClock <int>::Source
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{
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public:
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elapsed_type operator() ()
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{
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return static_cast <elapsed_type> (
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RelativeTime::fromStartup().inSeconds());
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}
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};
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//------------------------------------------------------------------------------
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/** A manually-operated clock.
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This can be useful for unit tests.
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*/
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class ManualClock : public DiscreteClock <int>::Source
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{
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private:
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elapsed_type m_now;
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public:
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ManualClock ()
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: m_now (elapsed_type())
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{
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}
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elapsed_type& now()
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{
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return m_now;
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}
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elapsed_type now() const
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{
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return m_now;
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}
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elapsed_type operator() ()
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{
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return now();
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}
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};
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}
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#endif
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