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Fix DecayingSample treatment of the window

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This commit is contained in:
Vinnie Falco
2014-11-20 10:30:25 -08:00
committed by Nik Bougalis
parent baf0d09455
commit 64d0f7fffd
1 changed files with 10 additions and 12 deletions
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22
src/ripple/basics/DecayingSample.h
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@@ -20,9 +20,13 @@
#ifndef RIPPLE_BASICS_DECAYINGSAMPLE_H_INCLUDED
#define RIPPLE_BASICS_DECAYINGSAMPLE_H_INCLUDED
#include <chrono>
namespace ripple {
/** Sampling function using exponential decay to provide a continuous value. */
/** Sampling function using exponential decay to provide a continuous value.
@tparam The number of seconds in the decay window.
*/
template <int Window, typename Clock>
class DecayingSample
{
@@ -69,26 +73,20 @@ private:
if (m_value != value_type())
{
typename Clock::duration n (now - m_when);
std::size_t elapsed = std::chrono::duration_cast<
std::chrono::seconds>(now - m_when).count();
// A span larger than four times the window decays the
// value to an insignificant amount so just reset it.
//
typename Clock::duration window (Window);
if (n > 4 * window)
if (elapsed > 4 * Window)
{
m_value = value_type();
}
else
{
value_type const tick_value = 1;
typename Clock::duration const tick (tick_value);
typename Clock::duration const zero (0);
while (n > zero)
{
n -= tick;
m_value -= (m_value + Window - tick_value) / Window;
}
while (elapsed--)
m_value -= (m_value + Window - 1) / Window;
}
}