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#pragma once
#include "Program.hpp"
#include <thread>
#include <future>
#include <mutex>
namespace QuickMedia {
template <class T, class... Args>
class AsyncTask {
public:
using CallbackFunc = std::function<T(Args&&... args)>;
AsyncTask() = default;
AsyncTask(CallbackFunc callback_func, Args&&... args) {
std::lock_guard<std::mutex> lock(mutex);
std::promise<T> promise;
future = promise.get_future();
thread = std::thread(&AsyncTask::thread_handler, this, std::move(promise), std::move(callback_func), std::forward<Args>(args)...);
}
AsyncTask(AsyncTask &&other) noexcept {
cancel();
std::lock_guard<std::mutex> lock(mutex);
thread = std::move(other.thread);
future = std::move(other.future);
}
AsyncTask& operator=(AsyncTask &&other) noexcept {
cancel();
std::lock_guard<std::mutex> lock(mutex);
thread = std::move(other.thread);
future = std::move(other.future);
return *this;
}
~AsyncTask() {
cancel();
}
bool valid() {
std::lock_guard<std::mutex> lock(mutex);
return future.valid();
}
bool ready() {
std::lock_guard<std::mutex> lock(mutex);
return future.valid() && future.wait_for(std::chrono::seconds(0)) == std::future_status::ready;
}
T get() {
std::lock_guard<std::mutex> lock(mutex);
if constexpr(std::is_same<T, void>::value) {
if(thread.joinable()) {
thread.join();
future.get();
}
} else {
T result = T();
if(thread.joinable()) {
thread.join();
result = std::move(future.get());
}
return result;
}
}
void cancel() {
std::lock_guard<std::mutex> lock(mutex);
if(future.valid()) {
program_kill_in_thread(thread.get_id());
if(thread.joinable()) {
thread.join();
future.get();
}
}
}
private:
void thread_handler(std::promise<T> &&promise, CallbackFunc callback_func, Args&&... args) {
if constexpr(std::is_same<T, void>::value) {
callback_func(std::forward<Args>(args)...);
promise.set_value();
} else {
promise.set_value(callback_func(std::forward<Args>(args)...));
}
}
private:
std::thread thread;
std::future<T> future;
std::mutex mutex;
};
}
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