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#pragma once
#include <QList>
#include <functional>
#include <QSharedPointer>
#include <QEventLoop>
#include <QDebug>
#include "resultprovider.h"
namespace async {
/*
* A result set specialization that provides a syncronous list.
*
* Only for testing purposes.
*
* WARNING: The nested eventloop can cause all sorts of trouble. Use only in testing code.
*/
template <class T>
class SyncListResult : public QList<T>
{
public:
SyncListResult(const QSharedPointer<Sink::ResultEmitter<T>> &emitter) : QList<T>(), mEmitter(emitter)
{
emitter->onAdded([this](const T &value) { this->append(value); });
emitter->onModified([this](const T &value) {
for (auto it = this->begin(); it != this->end(); it++) {
if (**it == *value) {
it = this->erase(it);
this->insert(it, value);
break;
}
}
});
emitter->onRemoved([this](const T &value) {
for (auto it = this->begin(); it != this->end(); it++) {
if (**it == *value) {
this->erase(it);
break;
}
}
});
emitter->onInitialResultSetComplete([this]() {
if (eventLoopAborter) {
eventLoopAborter();
// Be safe in case of a second invocation of the complete handler
eventLoopAborter = std::function<void()>();
}
});
emitter->onComplete([this]() { mEmitter.clear(); });
emitter->onClear([this]() { this->clear(); });
}
void exec()
{
QEventLoop eventLoop;
eventLoopAborter = [&eventLoop]() { eventLoop.quit(); };
eventLoop.exec();
}
private:
QSharedPointer<Sink::ResultEmitter<T>> mEmitter;
std::function<void()> eventLoopAborter;
};
}
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