Robin E.R. Davies
93 lines
2.8 KiB
C++
93 lines
2.8 KiB
C++
/*
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* Copyright (c) Robin E.R. Davies
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* All rights reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "Tone3000Throttler.hpp"
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using namespace pipedal;
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static constexpr size_t THROTTLING_LIMIT = 80;
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static constexpr size_t BULK_DOWNLOAD_LIMIT = 20;
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Tone3000Throttler Tone3000Throttler::instance_;
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void Tone3000Throttler::ClearExpiredDownloads_()
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{
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auto expiryTime = clock_t::now();
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expiryTime -= std::chrono::seconds(60);
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while (downloadTimes.size() > 0 && downloadTimes[0] < expiryTime) {
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downloadTimes.erase(downloadTimes.begin());
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}
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}
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void Tone3000Throttler::AddDownload()
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{
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std::lock_guard lock{m_mutex};
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this->downloadTimes.push_back(clock_t::now());
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}
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bool Tone3000Throttler::IsThrottled()
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{
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std::lock_guard lock{m_mutex};
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ClearExpiredDownloads_();
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return this->downloadTimes.size() >= THROTTLING_LIMIT;
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}
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size_t Tone3000Throttler::ReserveDownloadSlots(size_t requested)
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{
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ClearExpiredDownloads_();
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size_t result;
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size_t reserved = this->downloadTimes.size();
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if (reserved == THROTTLING_LIMIT) {
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return 0;
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}
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if (reserved < BULK_DOWNLOAD_LIMIT)
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{
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if (requested+reserved >= BULK_DOWNLOAD_LIMIT)
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{
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result = BULK_DOWNLOAD_LIMIT-reserved;
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if (result == 0)
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{
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result = 1;
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}
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} else {
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result = requested;
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}
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} else {
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result = 1; // download one at a time!
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}
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auto now = clock_t::now();
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for (size_t i = 0; i < result; ++i)
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{
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this->downloadTimes.push_back(now);
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}
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return result;
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}
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size_t Tone3000Throttler::AvailableDownloadSlots() {
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ClearExpiredDownloads_();
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return THROTTLING_LIMIT-this->downloadTimes.size();
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} |