55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 Library 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
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* TokenBucket.cpp
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* Token Bucket implementation.
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* Copyright (C) 2010 Simon Newton
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*/
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#include <algorithm>
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#include "olad/TokenBucket.h"
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namespace ola {
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/*
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* Check if we have enough tokens for an operation. Assuming there is enough
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* tokens, the count is decremented by one.
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* @param now the current time
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* @returns true if there is enough tokens, false otherwise
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*/
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bool TokenBucket::GetToken(const TimeStamp &now) {
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Count(now);
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if (m_count > 0) {
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m_count--;
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return true;
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}
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return false;
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}
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/*
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* Get the number of tokens in the bucket
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*/
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unsigned int TokenBucket::Count(const TimeStamp &now) {
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int64_t delta = (now - m_last).AsInt();
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unsigned int tokens = delta * m_rate / USEC_IN_SECONDS;
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m_count = std::min(m_max, m_count + tokens);
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if (tokens)
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m_last += ola::TimeInterval(tokens * USEC_IN_SECONDS / m_rate);
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return m_count;
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}
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} // ola
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