43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
/*
|
|
* Copyright (c) Facebook, Inc. and its 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 <chrono>
|
|
|
|
#include <folly/experimental/observer/Observer.h>
|
|
|
|
namespace folly {
|
|
namespace observer {
|
|
|
|
/**
|
|
* The returned Observer will proxy updates from the input observer but will
|
|
* delay the propagation of each update by some duration between 0 ms and
|
|
* lag + jitter. In addition, if an update arrives while no preceding jittered
|
|
* updates are still in flight, then the delay applied to the latest update will
|
|
* be a uniformly random duration between lag - jitter and lag + jitter.
|
|
*/
|
|
template <typename T>
|
|
Observer<T> withJitter(
|
|
Observer<T> observer,
|
|
std::chrono::milliseconds lag,
|
|
std::chrono::milliseconds jitter);
|
|
|
|
} // namespace observer
|
|
} // namespace folly
|
|
|
|
#include <folly/experimental/observer/WithJitter-inl.h>
|