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namespace async {
template<typename T>
KAsync::Job<T> run(const std::function<T()> &f)
{
return KAsync::start<T>([f](KAsync::Future<T> &future) {
auto result = QtConcurrent::run(f);
auto watcher = new QFutureWatcher<T>;
watcher->setFuture(result);
QObject::connect(watcher, &QFutureWatcher<T>::finished, watcher, [&future, watcher]() {
future.setValue(watcher->future().result());
delete watcher;
future.setFinished();
});
});
}
}
void run()
{
return KAsync::start<T>([f](KAsync::Future<T> &future) {
auto result = QtConcurrent::run(f);
auto watcher = new QFutureWatcher<T>;
watcher->setFuture(result);
QObject::connect(watcher, &QFutureWatcher<T>::finished, watcher, [&future]() {
future.setFinished();
});
});
}
class ResourceAccessFactory {
public:
static ResourceAccessFactory &instance()
{
static ResourceAccessFactory *instance = 0;
if (!instance) {
instance = new ResourceAccessFactory;
}
return *instance;
}
Sink::ResourceAccess::Ptr getAccess(const QByteArray &instanceIdentifier)
{
if (!mCache.contains(instanceIdentifier)) {
//Reuse the pointer if something else kept the resourceaccess alive
if (mWeakCache.contains(instanceIdentifier)) {
auto sharedPointer = mWeakCache.value(instanceIdentifier).toStrongRef();
if (sharedPointer) {
mCache.insert(instanceIdentifier, sharedPointer);
}
}
if (!mCache.contains(instanceIdentifier)) {
//Create a new instance if necessary
auto sharedPointer = Sink::ResourceAccess::Ptr::create(instanceIdentifier);
QObject::connect(sharedPointer.data(), &Sink::ResourceAccess::ready, sharedPointer.data(), [this, instanceIdentifier](bool ready) {
if (!ready) {
mCache.remove(instanceIdentifier);
}
});
mCache.insert(instanceIdentifier, sharedPointer);
mWeakCache.insert(instanceIdentifier, sharedPointer);
}
}
if (!mTimer.contains(instanceIdentifier)) {
auto timer = new QTimer;
//Drop connection after 3 seconds (which is a random value)
QObject::connect(timer, &QTimer::timeout, timer, [this, instanceIdentifier]() {
mCache.remove(instanceIdentifier);
});
timer->setInterval(3000);
mTimer.insert(instanceIdentifier, timer);
}
auto timer = mTimer.value(instanceIdentifier);
timer->start();
return mCache.value(instanceIdentifier);
}
QHash<QByteArray, QWeakPointer<Sink::ResourceAccess> > mWeakCache;
QHash<QByteArray, Sink::ResourceAccess::Ptr> mCache;
QHash<QByteArray, QTimer*> mTimer;
};
class ChangeReplay : public QObject
{
Q_OBJECT
public:
typedef std::function<KAsync::Job<void>(const QByteArray &type, const QByteArray &key, const QByteArray &value)> ReplayFunction;
ChangeReplay(const QString &resourceName, const ReplayFunction &replayFunction)
: mStorage(storageLocation(), resourceName, Storage::ReadOnly),
mChangeReplayStore(storageLocation(), resourceName + ".changereplay", Storage::ReadWrite),
mReplayFunction(replayFunction)
{
}
qint64 getLastReplayedRevision()
{
qint64 lastReplayedRevision = 0;
auto replayStoreTransaction = mChangeReplayStore.createTransaction(Storage::ReadOnly);
replayStoreTransaction.openDatabase().scan("lastReplayedRevision", [&lastReplayedRevision](const QByteArray &key, const QByteArray &value) -> bool {
lastReplayedRevision = value.toLongLong();
return false;
}, [](const Storage::Error &) {
});
return lastReplayedRevision;
}
bool allChangesReplayed()
{
const qint64 topRevision = Storage::maxRevision(mStorage.createTransaction(Storage::ReadOnly));
const qint64 lastReplayedRevision = getLastReplayedRevision();
Trace() << "All changes replayed " << topRevision << lastReplayedRevision;
return (lastReplayedRevision >= topRevision);
}
signals:
void changesReplayed();
public slots:
void revisionChanged()
{
auto mainStoreTransaction = mStorage.createTransaction(Storage::ReadOnly);
auto replayStoreTransaction = mChangeReplayStore.createTransaction(Storage::ReadWrite);
qint64 lastReplayedRevision = 1;
replayStoreTransaction.openDatabase().scan("lastReplayedRevision", [&lastReplayedRevision](const QByteArray &key, const QByteArray &value) -> bool {
lastReplayedRevision = value.toLongLong();
return false;
}, [](const Storage::Error &) {
});
const qint64 topRevision = Storage::maxRevision(mainStoreTransaction);
Trace() << "Changereplay from " << lastReplayedRevision << " to " << topRevision;
if (lastReplayedRevision <= topRevision) {
qint64 revision = lastReplayedRevision;
for (;revision <= topRevision; revision++) {
const auto uid = Storage::getUidFromRevision(mainStoreTransaction, revision);
const auto type = Storage::getTypeFromRevision(mainStoreTransaction, revision);
const auto key = Storage::assembleKey(uid, revision);
mainStoreTransaction.openDatabase(type + ".main").scan(key, [&lastReplayedRevision, type, this](const QByteArray &key, const QByteArray &value) -> bool {
mReplayFunction(type, key, value).exec();
//TODO make for loop async, and pass to async replay function together with type
Trace() << "Replaying " << key;
return false;
}, [key](const Storage::Error &) {
ErrorMsg() << "Failed to replay change " << key;
});
}
revision--;
replayStoreTransaction.openDatabase().write("lastReplayedRevision", QByteArray::number(revision));
replayStoreTransaction.commit();
Trace() << "Replayed until " << revision;
}
emit changesReplayed();
}
private:
Sink::Storage mStorage;
Sink::Storage mChangeReplayStore;
ReplayFunction mReplayFunction;
};
KAsync::Job<void> processPipeline()
{
mPipeline->startTransaction();
Trace() << "Cleaning up from " << mPipeline->cleanedUpRevision() + 1 << " to " << mLowerBoundRevision;
for (qint64 revision = mPipeline->cleanedUpRevision() + 1; revision <= mLowerBoundRevision; revision++) {
mPipeline->cleanupRevision(revision);
}
mPipeline->commit();
//Go through all message queues
auto it = QSharedPointer<QListIterator<MessageQueue*> >::create(mCommandQueues);
return KAsync::doWhile(
[it]() { return it->hasNext(); },
[it, this](KAsync::Future<void> &future) {
auto queue = it->next();
processQueue(queue).then<void>([&future]() {
Trace() << "Queue processed";
future.setFinished();
}).exec();
}
);
}
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