folly/folly/stats/QuantileEstimator.h

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * 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.
 */

#pragma once

#include <folly/stats/TDigest.h>
#include <folly/stats/detail/BufferedStat.h>

namespace folly {

struct QuantileEstimates { … };

/*
 * A QuantileEstimator that buffers writes for 1 second.
 */
template <typename ClockT = std::chrono::steady_clock>
class SimpleQuantileEstimator { … };

/*
 * A QuantileEstimator that keeps values for nWindows * windowDuration (see
 * constructor). Values are buffered for windowDuration.
 */
template <typename ClockT = std::chrono::steady_clock>
class SlidingWindowQuantileEstimator { … };

} // namespace folly

#include <folly/stats/QuantileEstimator-inl.h>