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#include "FutureScheduler.h"
#include <mutex>
#include <QThreadPool>
FutureScheduler::FutureScheduler(QObject *parent)
: QObject(parent), Alive(0), Stopping(false)
{
static std::once_flag once;
std::call_once(once, []() {
QThreadPool::globalInstance()->setMaxThreadCount(4);
});
}
FutureScheduler::~FutureScheduler()
{
shutdownWaitForFinished();
}
void FutureScheduler::shutdownWaitForFinished() noexcept
{
QMutexLocker locker(&Mutex);
Stopping = true;
while (Alive > 0)
{
Condition.wait(&Mutex);
}
}
QPair<bool, QFuture<void>> FutureScheduler::run(std::function<void()> function) noexcept
{
return execute<void>([this, function](QFutureWatcher<void> *) {
return QtConcurrent::run([this, function] {
try
{
function();
}
catch (const std::exception &exception)
{
qWarning() << "Exception thrown from async function: " << exception.what();
}
done();
});
});
}
QPair<bool, QFuture<QJSValueList>> FutureScheduler::run(std::function<QJSValueList()> function, const QJSValue &callback)
{
if (!callback.isCallable())
{
throw std::runtime_error("js callback must be callable");
}
return execute<QJSValueList>([this, function, callback](QFutureWatcher<QJSValueList> *watcher) {
connect(watcher, &QFutureWatcher<QJSValueList>::finished, [watcher, callback] {
QJSValue(callback).call(watcher->future().result());
});
return QtConcurrent::run([this, function] {
QJSValueList result;
try
{
result = function();
}
catch (const std::exception &exception)
{
qWarning() << "Exception thrown from async function: " << exception.what();
}
done();
return result;
});
});
}
bool FutureScheduler::stopping() const noexcept
{
return Stopping;
}
bool FutureScheduler::add() noexcept
{
QMutexLocker locker(&Mutex);
if (Stopping)
{
return false;
}
++Alive;
return true;
}
void FutureScheduler::done() noexcept
{
{
QMutexLocker locker(&Mutex);
--Alive;
}
Condition.wakeAll();
}
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