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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "DecayCounter.h"
#include "Formatter.h"
#include "include/encoding.h"
void DecayCounter::encode(bufferlist& bl) const
{
decay();
ENCODE_START(5, 4, bl);
encode(val, bl);
ENCODE_FINISH(bl);
}
void DecayCounter::decode(bufferlist::const_iterator &p)
{
DECODE_START_LEGACY_COMPAT_LEN(5, 4, 4, p);
if (struct_v < 2) {
double k = 0.0;
decode(k, p);
}
if (struct_v < 3) {
double k = 0.0;
decode(k, p);
}
decode(val, p);
if (struct_v < 5) {
double delta, _;
decode(delta, p);
val += delta;
decode(_, p); /* velocity */
}
last_decay = clock::now();
DECODE_FINISH(p);
}
void DecayCounter::dump(Formatter *f) const
{
decay();
f->dump_float("value", val);
f->dump_float("halflife", rate.get_halflife());
}
void DecayCounter::generate_test_instances(std::list<DecayCounter*>& ls)
{
DecayCounter *counter = new DecayCounter();
counter->val = 3.0;
counter->rate = DecayRate(2.0);
ls.push_back(counter);
counter = new DecayCounter();
ls.push_back(counter);
}
void DecayCounter::decay(double delta) const
{
auto now = clock::now();
double el = std::chrono::duration<double>(now - last_decay).count();
// calculate new value
double newval = val * exp(el * rate.k) + delta;
if (newval < .01) {
newval = 0.0;
}
val = newval;
last_decay = now;
}
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