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#pragma once
#include "fwd.h"
#include "future.h"
#include <util/thread/factory.h>
#include <functional>
namespace NThreading {
template <typename TR, bool IgnoreException>
class TLegacyFuture: public IThreadFactory::IThreadAble, TNonCopyable {
public:
typedef TR(TFunctionSignature)();
using TFunctionObjectType = std::function<TFunctionSignature>;
using TResult = typename TFunctionObjectType::result_type;
private:
TFunctionObjectType Func_;
TPromise<TResult> Result_;
THolder<IThreadFactory::IThread> Thread_;
public:
inline TLegacyFuture(const TFunctionObjectType func, IThreadFactory* pool = SystemThreadFactory())
: Func_(func)
, Result_(NewPromise<TResult>())
, Thread_(pool->Run(this))
{
}
inline ~TLegacyFuture() override {
this->Join();
}
inline TResult Get() {
this->Join();
return Result_.GetValue();
}
private:
inline void Join() {
if (Thread_) {
Thread_->Join();
Thread_.Destroy();
}
}
template <typename Result, bool IgnoreException_>
struct TExecutor {
static void SetPromise(TPromise<Result>& promise, const TFunctionObjectType& func) {
if (IgnoreException_) {
try {
promise.SetValue(func());
} catch (...) {
}
} else {
promise.SetValue(func());
}
}
};
template <bool IgnoreException_>
struct TExecutor<void, IgnoreException_> {
static void SetPromise(TPromise<void>& promise, const TFunctionObjectType& func) {
if (IgnoreException_) {
try {
func();
promise.SetValue();
} catch (...) {
}
} else {
func();
promise.SetValue();
}
}
};
void DoExecute() override {
TExecutor<TResult, IgnoreException>::SetPromise(Result_, Func_);
}
};
}
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