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#include "genericresource.h"
#include "entitybuffer.h"
#include "pipeline.h"
#include "queuedcommand_generated.h"
#include "createentity_generated.h"
#include "domainadaptor.h"
#include "commands.h"
#include "index.h"
#include "log.h"
#include "definitions.h"
using namespace Akonadi2;
/**
* Drives the pipeline using the output from all command queues
*/
class Processor : public QObject
{
Q_OBJECT
public:
Processor(Akonadi2::Pipeline *pipeline, QList<MessageQueue*> commandQueues)
: QObject(),
mPipeline(pipeline),
mCommandQueues(commandQueues),
mProcessingLock(false)
{
for (auto queue : mCommandQueues) {
const bool ret = connect(queue, &MessageQueue::messageReady, this, &Processor::process);
Q_UNUSED(ret);
}
}
signals:
void error(int errorCode, const QString &errorMessage);
private:
bool messagesToProcessAvailable()
{
for (auto queue : mCommandQueues) {
if (!queue->isEmpty()) {
return true;
}
}
return false;
}
private slots:
void process()
{
if (mProcessingLock) {
return;
}
mProcessingLock = true;
auto job = processPipeline().then<void>([this]() {
mProcessingLock = false;
if (messagesToProcessAvailable()) {
process();
}
}).exec();
}
KAsync::Job<qint64> processQueuedCommand(const Akonadi2::QueuedCommand *queuedCommand)
{
Log() << "Processing command: " << Akonadi2::Commands::name(queuedCommand->commandId());
//Throw command into appropriate pipeline
switch (queuedCommand->commandId()) {
case Akonadi2::Commands::DeleteEntityCommand:
return mPipeline->deletedEntity(queuedCommand->command()->Data(), queuedCommand->command()->size());
case Akonadi2::Commands::ModifyEntityCommand:
return mPipeline->modifiedEntity(queuedCommand->command()->Data(), queuedCommand->command()->size());
case Akonadi2::Commands::CreateEntityCommand:
return mPipeline->newEntity(queuedCommand->command()->Data(), queuedCommand->command()->size());
default:
return KAsync::error<qint64>(-1, "Unhandled command");
}
return KAsync::null<qint64>();
}
KAsync::Job<qint64, qint64> processQueuedCommand(const QByteArray &data)
{
flatbuffers::Verifier verifyer(reinterpret_cast<const uint8_t *>(data.constData()), data.size());
if (!Akonadi2::VerifyQueuedCommandBuffer(verifyer)) {
Warning() << "invalid buffer";
// return KAsync::error<void, qint64>(1, "Invalid Buffer");
}
auto queuedCommand = Akonadi2::GetQueuedCommand(data.constData());
const auto commandId = queuedCommand->commandId();
Trace() << "Dequeued Command: " << Akonadi2::Commands::name(commandId);
return processQueuedCommand(queuedCommand).then<qint64, qint64>(
[commandId](qint64 createdRevision) -> qint64 {
Trace() << "Command pipeline processed: " << Akonadi2::Commands::name(commandId);
return createdRevision;
}
,
[](int errorCode, QString errorMessage) {
//FIXME propagate error, we didn't handle it
Warning() << "Error while processing queue command: " << errorMessage;
}
);
}
//Process all messages of this queue
KAsync::Job<void> processQueue(MessageQueue *queue)
{
return KAsync::start<void>([this](){
mPipeline->startTransaction();
}).then(KAsync::dowhile(
[queue]() { return !queue->isEmpty(); },
[this, queue](KAsync::Future<void> &future) {
const int batchSize = 100;
queue->dequeueBatch(batchSize, [this](const QByteArray &data) {
return KAsync::start<void>([this, data](KAsync::Future<void> &future) {
processQueuedCommand(data).then<void, qint64>([&future, this](qint64 createdRevision) {
Trace() << "Created revision " << createdRevision;
//We don't have a writeback yet, so we cleanup revisions immediately
//TODO: only cleanup once writeback is done
mPipeline->cleanupRevision(createdRevision);
future.setFinished();
}).exec();
});
}
).then<void>([&future, queue](){
future.setFinished();
},
[&future](int i, QString error) {
if (i != MessageQueue::ErrorCodes::NoMessageFound) {
Warning() << "Error while getting message from messagequeue: " << error;
}
future.setFinished();
}).exec();
}
)).then<void>([this]() {
mPipeline->commit();
});
}
KAsync::Job<void> processPipeline()
{
//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();
}
);
}
private:
Akonadi2::Pipeline *mPipeline;
//Ordered by priority
QList<MessageQueue*> mCommandQueues;
bool mProcessingLock;
};
GenericResource::GenericResource(const QByteArray &resourceInstanceIdentifier, const QSharedPointer<Pipeline> &pipeline)
: Akonadi2::Resource(),
mUserQueue(Akonadi2::storageLocation(), resourceInstanceIdentifier + ".userqueue"),
mSynchronizerQueue(Akonadi2::storageLocation(), resourceInstanceIdentifier + ".synchronizerqueue"),
mResourceInstanceIdentifier(resourceInstanceIdentifier),
mPipeline(pipeline ? pipeline : QSharedPointer<Akonadi2::Pipeline>::create(resourceInstanceIdentifier)),
mError(0)
{
mProcessor = new Processor(mPipeline.data(), QList<MessageQueue*>() << &mUserQueue << &mSynchronizerQueue);
QObject::connect(mProcessor, &Processor::error, [this](int errorCode, const QString &msg) { onProcessorError(errorCode, msg); });
QObject::connect(mPipeline.data(), &Pipeline::revisionUpdated, this, &Resource::revisionUpdated);
mCommitQueueTimer.setInterval(100);
mCommitQueueTimer.setSingleShot(true);
QObject::connect(&mCommitQueueTimer, &QTimer::timeout, &mUserQueue, &MessageQueue::commit);
}
GenericResource::~GenericResource()
{
}
void GenericResource::onProcessorError(int errorCode, const QString &errorMessage)
{
Warning() << "Received error from Processor: " << errorCode << errorMessage;
mError = errorCode;
}
int GenericResource::error() const
{
return mError;
}
void GenericResource::enqueueCommand(MessageQueue &mq, int commandId, const QByteArray &data)
{
//TODO get rid of m_fbb member variable
m_fbb.Clear();
auto commandData = Akonadi2::EntityBuffer::appendAsVector(m_fbb, data.constData(), data.size());
auto buffer = Akonadi2::CreateQueuedCommand(m_fbb, commandId, commandData);
Akonadi2::FinishQueuedCommandBuffer(m_fbb, buffer);
mq.enqueue(m_fbb.GetBufferPointer(), m_fbb.GetSize());
}
void GenericResource::processCommand(int commandId, const QByteArray &data)
{
static int modifications = 0;
const int batchSize = 100;
mUserQueue.startTransaction();
enqueueCommand(mUserQueue, commandId, data);
modifications++;
if (modifications >= batchSize) {
mUserQueue.commit();
modifications = 0;
mCommitQueueTimer.stop();
} else {
mCommitQueueTimer.start();
}
}
static void waitForDrained(KAsync::Future<void> &f, MessageQueue &queue)
{
if (queue.isEmpty()) {
f.setFinished();
} else {
QObject::connect(&queue, &MessageQueue::drained, [&f]() {
f.setFinished();
});
}
};
KAsync::Job<void> GenericResource::processAllMessages()
{
//We have to wait for all items to be processed to ensure the synced items are available when a query gets executed.
//TODO: report errors while processing sync?
//TODO JOBAPI: A helper that waits for n events and then continues?
return KAsync::start<void>([this](KAsync::Future<void> &f) {
if (mCommitQueueTimer.isActive()) {
auto context = new QObject;
QObject::connect(&mCommitQueueTimer, &QTimer::timeout, context, [&f, context]() {
delete context;
f.setFinished();
});
} else {
f.setFinished();
}
}).then<void>([this](KAsync::Future<void> &f) {
waitForDrained(f, mSynchronizerQueue);
}).then<void>([this](KAsync::Future<void> &f) {
waitForDrained(f, mUserQueue);
});
}
#include "genericresource.moc"
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