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-rw-r--r--src/jaegertracing/jaeger-client-cpp/src/jaegertracing/utils/RateLimiter.h71
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diff --git a/src/jaegertracing/jaeger-client-cpp/src/jaegertracing/utils/RateLimiter.h b/src/jaegertracing/jaeger-client-cpp/src/jaegertracing/utils/RateLimiter.h
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+++ b/src/jaegertracing/jaeger-client-cpp/src/jaegertracing/utils/RateLimiter.h
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+/*
+ * Copyright (c) 2017 Uber Technologies, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef JAEGERTRACING_UTILS_RATELIMITER_H
+#define JAEGERTRACING_UTILS_RATELIMITER_H
+
+#include <chrono>
+#include <mutex>
+
+namespace jaegertracing {
+namespace utils {
+
+template <typename ClockType = std::chrono::steady_clock>
+class RateLimiter {
+ public:
+ using Clock = ClockType;
+
+ RateLimiter(double creditsPerSecond, double maxBalance)
+ : _creditsPerSecond(creditsPerSecond)
+ , _maxBalance(maxBalance)
+ , _balance(_maxBalance)
+ , _lastTick(Clock::now())
+ {
+ }
+
+ bool checkCredit(double itemCost)
+ {
+ std::lock_guard<std::mutex> lock(_mutex);
+ const auto currentTime = Clock::now();
+ const auto elapsedTime =
+ std::chrono::duration<double>(currentTime - _lastTick);
+ _lastTick = currentTime;
+
+ _balance += elapsedTime.count() * _creditsPerSecond;
+ if (_balance > _maxBalance) {
+ _balance = _maxBalance;
+ }
+
+ if (_balance >= itemCost) {
+ _balance -= itemCost;
+ return true;
+ }
+
+ return false;
+ }
+
+ private:
+ double _creditsPerSecond;
+ double _maxBalance;
+ double _balance;
+ typename Clock::time_point _lastTick;
+ std::mutex _mutex;
+};
+
+} // namespace utils
+} // namespace jaegertracing
+
+#endif // JAEGERTRACING_UTILS_RATELIMITER_H