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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "filestreamermanager.h"
#include "filestreamer.h"
#include "threadutils.h"
#include "utilstr.h"
#include <QMutex>
#include <QMutexLocker>
#include <QThread>
#include <QWaitCondition>
#include <unordered_map>
namespace Utils::FileStreamerManager {
// TODO: destruct the instance before destructing ProjectExplorer::DeviceManager (?)
static FileStreamHandle generateUniqueHandle()
{
static std::atomic_int handleCounter = 1;
return FileStreamHandle(handleCounter.fetch_add(1));
}
static QMutex s_mutex = {};
static QWaitCondition s_waitCondition = {};
static std::unordered_map<FileStreamHandle, FileStreamer *> s_fileStreamers = {};
static void addStreamer(FileStreamHandle handle, FileStreamer *streamer)
{
QMutexLocker locker(&s_mutex);
const bool added = s_fileStreamers.try_emplace(handle, streamer).second;
QTC_CHECK(added);
}
static void removeStreamer(FileStreamHandle handle)
{
QMutexLocker locker(&s_mutex);
auto it = s_fileStreamers.find(handle);
QTC_ASSERT(it != s_fileStreamers.end(), return);
QTC_ASSERT(QThread::currentThread() == it->second->thread(), return);
s_fileStreamers.erase(it);
s_waitCondition.wakeAll();
}
static void deleteStreamer(FileStreamHandle handle)
{
QMutexLocker locker(&s_mutex);
auto it = s_fileStreamers.find(handle);
if (it == s_fileStreamers.end())
return;
if (QThread::currentThread() == it->second->thread()) {
delete it->second;
s_fileStreamers.erase(it);
s_waitCondition.wakeAll();
} else {
QMetaObject::invokeMethod(it->second, [handle] {
deleteStreamer(handle);
});
s_waitCondition.wait(&s_mutex);
QTC_CHECK(s_fileStreamers.find(handle) == s_fileStreamers.end());
}
}
static void deleteAllStreamers()
{
QMutexLocker locker(&s_mutex);
QTC_ASSERT(Utils::isMainThread(), return);
while (s_fileStreamers.size()) {
auto it = s_fileStreamers.begin();
if (QThread::currentThread() == it->second->thread()) {
delete it->second;
s_fileStreamers.erase(it);
s_waitCondition.wakeAll();
} else {
const FileStreamHandle handle = it->first;
QMetaObject::invokeMethod(it->second, [handle] {
deleteStreamer(handle);
});
s_waitCondition.wait(&s_mutex);
QTC_CHECK(s_fileStreamers.find(handle) == s_fileStreamers.end());
}
}
}
static FileStreamHandle checkHandle(FileStreamHandle handle)
{
QMutexLocker locker(&s_mutex);
return s_fileStreamers.find(handle) != s_fileStreamers.end() ? handle : FileStreamHandle(0);
}
static FileStreamHandle execute(const std::function<void(FileStreamer *)> &onSetup,
const std::function<void(FileStreamer *)> &onDone,
QObject *context)
{
FileStreamer *streamer = new FileStreamer;
onSetup(streamer);
const FileStreamHandle handle = generateUniqueHandle();
QTC_CHECK(context == nullptr || context->thread() == QThread::currentThread());
if (onDone) {
QObject *finalContext = context ? context : streamer;
QObject::connect(streamer, &FileStreamer::done, finalContext, [=] { onDone(streamer); });
}
QObject::connect(streamer, &FileStreamer::done, streamer, [=] {
removeStreamer(handle);
streamer->deleteLater();
});
addStreamer(handle, streamer);
streamer->start();
return checkHandle(handle); // The handle could have been already removed
}
FileStreamHandle copy(const Continuation<> &cont,
const FilePath &source,
const FilePath &destination)
{
const auto onSetup = [=](FileStreamer *streamer) {
streamer->setSource(source);
streamer->setDestination(destination);
};
const auto onDone = [=](FileStreamer *streamer) {
if (streamer->result() == Tasking::DoneResult::Success)
cont({});
else
cont(ResultError(Tr::tr("Failed copying file.")));
};
return execute(onSetup, onDone, cont.guard());
}
FileStreamHandle read(const Continuation<QByteArray> &cont,
const FilePath &source)
{
const auto onSetup = [=](FileStreamer *streamer) {
streamer->setStreamMode(StreamMode::Reader);
streamer->setSource(source);
};
const auto onDone = [=](FileStreamer *streamer) {
if (streamer->result() == Tasking::DoneResult::Success)
cont(streamer->readData());
else
cont(ResultError(Tr::tr("Failed reading file.")));
};
return execute(onSetup, onDone, cont.guard());
}
FileStreamHandle write(const Continuation<qint64> &cont,
const FilePath &destination,
const QByteArray &data)
{
const auto onSetup = [=](FileStreamer *streamer) {
streamer->setStreamMode(StreamMode::Writer);
streamer->setDestination(destination);
streamer->setWriteData(data);
};
const auto onDone = [=](FileStreamer *streamer) {
if (streamer->result() == Tasking::DoneResult::Success)
cont(0); // TODO: return write count?
else
cont(ResultError(Tr::tr("Failed writing file.")));
};
return execute(onSetup, onDone, cont.guard());
}
void stop(FileStreamHandle handle)
{
deleteStreamer(handle);
}
void stopAll()
{
deleteAllStreamers();
}
} // namespace Utils::FileStreamerManager
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