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/*
* Copyright (C) 2016 Christian Mollekopf <chrigi_1@fastmail.fm>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) version 3, or any
* later version accepted by the membership of KDE e.V. (or its
* successor approved by the membership of KDE e.V.), which shall
* act as a proxy defined in Section 6 of version 3 of the license.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "commandprocessor.h"
#include "commands.h"
#include "messagequeue.h"
#include "queuedcommand_generated.h"
#include "flush_generated.h"
#include "inspector.h"
#include "synchronizer.h"
#include "pipeline.h"
#include "bufferutils.h"
static int sBatchSize = 100;
using namespace Sink;
CommandProcessor::CommandProcessor(Sink::Pipeline *pipeline, QList<MessageQueue *> commandQueues) : QObject(), mPipeline(pipeline), mCommandQueues(commandQueues), mProcessingLock(false), mLowerBoundRevision(0)
{
for (auto queue : mCommandQueues) {
const bool ret = connect(queue, &MessageQueue::messageReady, this, &CommandProcessor::process);
Q_UNUSED(ret);
}
}
void CommandProcessor::setOldestUsedRevision(qint64 revision)
{
mLowerBoundRevision = revision;
}
bool CommandProcessor::messagesToProcessAvailable()
{
for (auto queue : mCommandQueues) {
if (!queue->isEmpty()) {
return true;
}
}
return false;
}
void CommandProcessor::process()
{
if (mProcessingLock) {
return;
}
mProcessingLock = true;
auto job = processPipeline()
.syncThen<void>([this]() {
mProcessingLock = false;
if (messagesToProcessAvailable()) {
process();
}
})
.exec();
}
KAsync::Job<qint64> CommandProcessor::processQueuedCommand(const Sink::QueuedCommand *queuedCommand)
{
SinkTrace() << "Processing command: " << Sink::Commands::name(queuedCommand->commandId());
const auto data = queuedCommand->command()->Data();
const auto size = queuedCommand->command()->size();
switch (queuedCommand->commandId()) {
case Sink::Commands::DeleteEntityCommand:
return mPipeline->deletedEntity(data, size);
case Sink::Commands::ModifyEntityCommand:
return mPipeline->modifiedEntity(data, size);
case Sink::Commands::CreateEntityCommand:
return mPipeline->newEntity(data, size);
case Sink::Commands::InspectionCommand:
Q_ASSERT(mInspector);
return mInspector->processCommand(data, size)
.syncThen<qint64>([]() { return -1; });
case Sink::Commands::FlushCommand:
return flush(data, size)
.syncThen<qint64>([]() { return -1; });
default:
return KAsync::error<qint64>(-1, "Unhandled command");
}
}
KAsync::Job<qint64> CommandProcessor::processQueuedCommand(const QByteArray &data)
{
flatbuffers::Verifier verifyer(reinterpret_cast<const uint8_t *>(data.constData()), data.size());
if (!Sink::VerifyQueuedCommandBuffer(verifyer)) {
SinkWarning() << "invalid buffer";
// return KAsync::error<void, qint64>(1, "Invalid Buffer");
}
auto queuedCommand = Sink::GetQueuedCommand(data.constData());
const auto commandId = queuedCommand->commandId();
SinkTrace() << "Dequeued Command: " << Sink::Commands::name(commandId);
return processQueuedCommand(queuedCommand)
.then<qint64, qint64>(
[this, commandId](const KAsync::Error &error, qint64 createdRevision) -> KAsync::Job<qint64> {
if (error) {
SinkWarning() << "Error while processing queue command: " << error.errorMessage;
return KAsync::error<qint64>(error);
}
SinkTrace() << "Command pipeline processed: " << Sink::Commands::name(commandId);
return KAsync::value<qint64>(createdRevision);
});
}
// Process all messages of this queue
KAsync::Job<void> CommandProcessor::processQueue(MessageQueue *queue)
{
auto time = QSharedPointer<QTime>::create();
return KAsync::syncStart<void>([this]() { mPipeline->startTransaction(); })
.then(KAsync::dowhile(
[this, queue, time]() -> KAsync::Job<KAsync::ControlFlowFlag> {
return queue->dequeueBatch(sBatchSize,
[this, time](const QByteArray &data) -> KAsync::Job<void> {
time->start();
return processQueuedCommand(data)
.syncThen<void, qint64>([this, time](qint64 createdRevision) {
SinkTrace() << "Created revision " << createdRevision << ". Processing took: " << Log::TraceTime(time->elapsed());
});
})
.then<KAsync::ControlFlowFlag>([queue](const KAsync::Error &error) {
if (error) {
if (error.errorCode != MessageQueue::ErrorCodes::NoMessageFound) {
SinkWarning() << "Error while getting message from messagequeue: " << error.errorMessage;
}
}
if (queue->isEmpty()) {
return KAsync::value<KAsync::ControlFlowFlag>(KAsync::Break);
} else {
return KAsync::value<KAsync::ControlFlowFlag>(KAsync::Continue);
}
});
}))
.syncThen<void>([this](const KAsync::Error &) { mPipeline->commit(); });
}
KAsync::Job<void> CommandProcessor::processPipeline()
{
auto time = QSharedPointer<QTime>::create();
time->start();
mPipeline->cleanupRevisions(mLowerBoundRevision);
SinkTrace() << "Cleanup done." << Log::TraceTime(time->elapsed());
// Go through all message queues
if (mCommandQueues.isEmpty()) {
return KAsync::null<void>();
}
auto it = QSharedPointer<QListIterator<MessageQueue *>>::create(mCommandQueues);
return KAsync::dowhile(
[it, this]() {
auto time = QSharedPointer<QTime>::create();
time->start();
auto queue = it->next();
return processQueue(queue)
.syncThen<KAsync::ControlFlowFlag>([this, time, it]() {
SinkTrace() << "Queue processed." << Log::TraceTime(time->elapsed());
if (it->hasNext()) {
return KAsync::Continue;
}
return KAsync::Break;
});
});
}
void CommandProcessor::setInspector(const QSharedPointer<Inspector> &inspector)
{
mInspector = inspector;
QObject::connect(mInspector.data(), &Inspector::notify, this, &CommandProcessor::notify);
}
void CommandProcessor::setSynchronizer(const QSharedPointer<Synchronizer> &synchronizer)
{
mSynchronizer = synchronizer;
QObject::connect(mSynchronizer.data(), &Synchronizer::notify, this, &CommandProcessor::notify);
setOldestUsedRevision(mSynchronizer->getLastReplayedRevision());
}
KAsync::Job<void> CommandProcessor::flush(void const *command, size_t size)
{
flatbuffers::Verifier verifier((const uint8_t *)command, size);
if (Sink::Commands::VerifyFlushBuffer(verifier)) {
auto buffer = Sink::Commands::GetFlush(command);
const auto flushType = buffer->type();
const auto flushId = BufferUtils::extractBuffer(buffer->id());
if (flushType == Sink::Flush::FlushReplayQueue) {
SinkTrace() << "Flushing synchronizer ";
Q_ASSERT(mSynchronizer);
mSynchronizer->flush(flushType, flushId);
} else {
SinkTrace() << "Emitting flush completion" << flushId;
Sink::Notification n;
n.type = Sink::Notification::FlushCompletion;
n.id = flushId;
emit notify(n);
}
return KAsync::null<void>();
}
return KAsync::error<void>(-1, "Invalid flush command.");
}
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