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#pragma once
#include <deque>
#include <mutex>
#include <condition_variable>
#include <optional>
#include <functional>
namespace QuickMedia {
template <typename T>
class MessageQueue {
public:
MessageQueue() : running(true) {
}
void push(T data) {
std::unique_lock<std::mutex> lock(mutex);
data_queue.push_back(std::move(data));
cv.notify_one();
}
std::optional<T> pop_wait() {
std::unique_lock<std::mutex> lock(mutex);
if(!running)
return std::nullopt;
while(data_queue.empty() && running) cv.wait(lock);
if(!running)
return std::nullopt;
T data = std::move(data_queue.front());
data_queue.pop_front();
return data;
}
std::optional<T> pop_if_available() {
std::unique_lock<std::mutex> lock(mutex);
if(data_queue.empty())
return std::nullopt;
T data = std::move(data_queue.front());
data_queue.pop_front();
return data;
}
void close() {
std::unique_lock<std::mutex> lock(mutex);
running = false;
data_queue.clear();
cv.notify_one();
}
void clear() {
std::unique_lock<std::mutex> lock(mutex);
data_queue.clear();
}
void restart() {
std::unique_lock<std::mutex> lock(mutex);
running = true;
}
// Return true from |callback| to remove the element
int erase_if(std::function<bool(T&)> callback) {
std::unique_lock<std::mutex> lock(mutex);
int removed = 0;
for(auto it = data_queue.begin(); it != data_queue.end();) {
if(callback(*it)) {
it = data_queue.erase(it);
++removed;
} else {
++it;
}
}
return removed;
}
bool is_running() const {
return running;
}
private:
std::deque<T> data_queue;
std::mutex mutex;
std::condition_variable cv;
bool running;
};
}
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