7215d4bfe9
these unused includes were identifier by clang-include-cleaner. after auditing these source files, all of the reports have been confirmed. please note, because quite a few source files relied on `utils/to_string.hh` to pull in the specialization of `fmt::formatter<std::optional<T>>`, after removing `#include <fmt/std.h>` from `utils/to_string.hh`, we have to include `fmt/std.h` directly. Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
35 lines
675 B
C++
35 lines
675 B
C++
/*
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* Copyright (C) 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
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*/
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#pragma once
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#include <seastar/core/timer.hh>
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#include <seastar/core/semaphore.hh>
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#include "seastarx.hh"
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namespace utils {
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/**
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* 100% naive rate limiter. Consider it a placeholder
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* Will let you process X "units" per second, then reset this every s.
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* Obviously, accuracy is virtually non-existent and steady rate will fluctuate.
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*/
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class rate_limiter {
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private:
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timer<lowres_clock> _timer;
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size_t _units_per_s;
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semaphore _sem {0};
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void on_timer();
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public:
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rate_limiter(size_t rate);
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future<> reserve(size_t u);
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};
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}
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