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51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
#ifndef OPENMW_COMPONENTS_MISC_PROGRESSREPORTER_H
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#define OPENMW_COMPONENTS_MISC_PROGRESSREPORTER_H
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#include <algorithm>
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#include <chrono>
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#include <mutex>
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#include <type_traits>
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#include <utility>
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namespace Misc
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{
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template <class Report>
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class ProgressReporter
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{
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public:
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explicit ProgressReporter(Report&& report = Report {})
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: mReport(std::forward<Report>(report))
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{}
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explicit ProgressReporter(std::chrono::steady_clock::duration interval, Report&& report = Report {})
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: mInterval(interval)
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, mReport(std::forward<Report>(report))
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{}
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void operator()(std::size_t provided, std::size_t expected)
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{
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expected = std::max(expected, provided);
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const bool shouldReport = [&]
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{
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const std::lock_guard lock(mMutex);
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const auto now = std::chrono::steady_clock::now();
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if (mNextReport > now || provided == expected)
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return false;
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if (mInterval.count() > 0)
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mNextReport = mNextReport + mInterval * ((now - mNextReport + mInterval).count() / mInterval.count());
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return true;
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} ();
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if (shouldReport)
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mReport(provided, expected);
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}
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private:
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const std::chrono::steady_clock::duration mInterval = std::chrono::seconds(1);
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Report mReport;
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std::mutex mMutex;
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std::chrono::steady_clock::time_point mNextReport {std::chrono::steady_clock::now() + mInterval};
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};
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}
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#endif
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