mirror of https://github.com/Icinga/icinga2.git
82 lines
2.5 KiB
C++
82 lines
2.5 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2014 Icinga Development Team (http://www.icinga.org) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#include "base/ringbuffer.h"
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#include "base/objectlock.h"
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using namespace icinga;
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RingBuffer::RingBuffer(RingBuffer::SizeType slots)
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: Object(), m_Slots(slots, 0), m_TimeValue(0)
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{ }
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RingBuffer::SizeType RingBuffer::GetLength(void) const
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{
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ObjectLock olock(this);
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return m_Slots.size();
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}
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void RingBuffer::InsertValue(RingBuffer::SizeType tv, int num)
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{
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ObjectLock olock(this);
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RingBuffer::SizeType offsetTarget = tv % m_Slots.size();
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if (tv > m_TimeValue) {
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RingBuffer::SizeType offset = m_TimeValue % m_Slots.size();
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/* walk towards the target offset, resetting slots to 0 */
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while (offset != offsetTarget) {
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offset++;
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if (offset >= m_Slots.size())
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offset = 0;
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m_Slots[offset] = 0;
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}
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m_TimeValue = tv;
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}
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m_Slots[offsetTarget] += num;
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}
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int RingBuffer::GetValues(RingBuffer::SizeType span) const
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{
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ObjectLock olock(this);
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if (span > m_Slots.size())
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span = m_Slots.size();
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int off = m_TimeValue % m_Slots.size();;
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int sum = 0;
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while (span > 0) {
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sum += m_Slots[off];
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if (off == 0)
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off = m_Slots.size();
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off--;
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span--;
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}
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return sum;
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}
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