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/*
* Copyright 2020 The Android Open Source Project
*
* 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 <cstddef>
#include <iterator>
#include <memory>
#include <mutex>
#include <queue>
namespace bluetooth {
namespace common {
template <typename T>
class CircularBuffer {
public:
explicit CircularBuffer(size_t size);
// Push one item to the circular buffer
void Push(T item);
// Take a snapshot of the circular buffer and return it as a vector
std::vector<T> Pull() const;
// Drain everything from the circular buffer and return them as a vector
std::vector<T> Drain();
private:
const size_t size_;
std::deque<T> queue_;
mutable std::mutex mutex_;
};
class Timestamper {
public:
virtual long long GetTimestamp() const = 0;
virtual ~Timestamper() {}
};
class TimestamperInMilliseconds : public Timestamper {
public:
long long GetTimestamp() const override {
return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch())
.count();
}
virtual ~TimestamperInMilliseconds() {}
};
template <typename T>
struct TimestampedEntry {
long long timestamp;
T entry;
};
template <typename T>
class TimestampedCircularBuffer : public CircularBuffer<TimestampedEntry<T>> {
public:
explicit TimestampedCircularBuffer(
size_t size, std::unique_ptr<Timestamper> timestamper = std::make_unique<TimestamperInMilliseconds>());
void Push(T item);
std::vector<TimestampedEntry<T>> Pull() const;
std::vector<TimestampedEntry<T>> Drain();
private:
std::unique_ptr<Timestamper> timestamper_{std::make_unique<TimestamperInMilliseconds>()};
};
} // namespace common
} // namespace bluetooth
template <typename T>
bluetooth::common::CircularBuffer<T>::CircularBuffer(size_t size) : size_(size) {}
template <typename T>
void bluetooth::common::CircularBuffer<T>::Push(const T item) {
std::unique_lock<std::mutex> lock(mutex_);
queue_.push_back(item);
while (queue_.size() > size_) {
queue_.pop_front();
}
}
template <typename T>
std::vector<T> bluetooth::common::CircularBuffer<T>::Pull() const {
std::unique_lock<std::mutex> lock(mutex_);
return std::vector<T>(queue_.cbegin(), queue_.cend());
}
template <typename T>
std::vector<T> bluetooth::common::CircularBuffer<T>::Drain() {
std::unique_lock<std::mutex> lock(mutex_);
std::vector<T> items(std::make_move_iterator(queue_.begin()), std::make_move_iterator(queue_.end()));
queue_.clear();
return items;
}
template <typename T>
bluetooth::common::TimestampedCircularBuffer<T>::TimestampedCircularBuffer(
size_t size, std::unique_ptr<Timestamper> timestamper)
: CircularBuffer<TimestampedEntry<T>>(size), timestamper_(std::move(timestamper)) {}
template <typename T>
void bluetooth::common::TimestampedCircularBuffer<T>::Push(const T item) {
TimestampedEntry<T> timestamped_entry{timestamper_->GetTimestamp(), item};
bluetooth::common::CircularBuffer<TimestampedEntry<T>>::Push(timestamped_entry);
}
template <typename T>
std::vector<struct bluetooth::common::TimestampedEntry<T>> bluetooth::common::TimestampedCircularBuffer<T>::Pull()
const {
return bluetooth::common::CircularBuffer<TimestampedEntry<T>>::Pull();
}
template <typename T>
std::vector<struct bluetooth::common::TimestampedEntry<T>> bluetooth::common::TimestampedCircularBuffer<T>::Drain() {
return bluetooth::common::CircularBuffer<TimestampedEntry<T>>::Drain();
}
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