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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#pragma once
#include <utils/temporaryfile.h>
#include <QFile>
#include <QDataStream>
#include <memory>
namespace Timeline {
template<typename Event>
class TraceStashFile
{
public:
TraceStashFile(const QString &pattern) : file(pattern) {}
bool open()
{
if (!file.open())
return false;
stream.setDevice(&file);
return true;
}
void append(const Event &event)
{
stream << event;
}
enum ReplayResult {
ReplaySuccess,
ReplayOpenFailed,
ReplayLoadFailed,
ReplayReadPastEnd
};
class Iterator
{
private:
friend class TraceStashFile<Event>;
std::unique_ptr<QFile> readFile;
std::unique_ptr<QDataStream> readStream;
Event nextEvent;
bool streamAtEnd;
bool open()
{
if (readFile->open(QIODevice::ReadOnly)) {
readStream->setDevice(readFile.get());
if (readStream->atEnd()) {
streamAtEnd = true;
} else {
(*readStream) >> nextEvent;
if (readPastEnd())
streamAtEnd = true;
}
return true;
}
streamAtEnd = true;
return false;
}
Iterator(const QString &fileName) :
readFile(std::make_unique<QFile>(fileName)),
readStream(std::make_unique<QDataStream>()),
streamAtEnd(false)
{
}
bool readPastEnd() const
{
return readStream->status() == QDataStream::ReadPastEnd;
}
public:
Event next()
{
if (readStream->atEnd()) {
streamAtEnd = true;
return std::move(nextEvent);
}
const Event result = std::move(nextEvent);
(*readStream) >> nextEvent;
if (readPastEnd())
streamAtEnd = true;
return result;
}
const Event &peekNext() const
{
return nextEvent;
}
bool hasNext() const
{
return !streamAtEnd;
}
};
Iterator iterator() const
{
Iterator i(file.fileName());
i.open();
return i;
}
template<typename Loader>
ReplayResult replay(const Loader &loader) const
{
Iterator replayIterator(file.fileName());
if (!replayIterator.open())
return ReplayOpenFailed;
while (replayIterator.hasNext()) {
if (!loader(replayIterator.next()))
return ReplayLoadFailed;
if (replayIterator.readPastEnd())
return ReplayReadPastEnd;
}
return ReplaySuccess;
}
void clear()
{
file.remove();
stream.setDevice(nullptr);
}
bool flush()
{
return file.flush();
}
private:
Utils::TemporaryFile file;
QDataStream stream;
};
}
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