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/*
* Copyright (C) 2016 Christian Mollekopf <mollekopf@kolabsys.com>
*
* 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 "changereplay.h"
#include "entitybuffer.h"
#include "log.h"
#include "definitions.h"
#include "bufferutils.h"
using namespace Sink;
#undef DEBUG_AREA
#define DEBUG_AREA "resource.changereplay"
ChangeReplay::ChangeReplay(const QByteArray &resourceName)
: mStorage(storageLocation(), resourceName, Storage::ReadOnly), mChangeReplayStore(storageLocation(), resourceName + ".changereplay", Storage::ReadWrite), mReplayInProgress(false)
{
Trace() << "Created change replay: " << resourceName;
}
qint64 ChangeReplay::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 ChangeReplay::allChangesReplayed()
{
const qint64 topRevision = Storage::maxRevision(mStorage.createTransaction(Storage::ReadOnly, [](const Sink::Storage::Error &error) {
Warning() << error.message;
}));
const qint64 lastReplayedRevision = getLastReplayedRevision();
Trace() << "All changes replayed " << topRevision << lastReplayedRevision;
return (lastReplayedRevision >= topRevision);
}
KAsync::Job<void> ChangeReplay::replayNextRevision()
{
mReplayInProgress = true;
auto mainStoreTransaction = mStorage.createTransaction(Storage::ReadOnly, [](const Sink::Storage::Error &error) {
Warning() << error.message;
});
auto replayStoreTransaction = mChangeReplayStore.createTransaction(Storage::ReadOnly, [](const Sink::Storage::Error &error) {
Warning() << error.message;
});
qint64 lastReplayedRevision = 0;
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);
auto recordReplayedRevision = [this](qint64 revision) {
auto replayStoreTransaction = mChangeReplayStore.createTransaction(Storage::ReadWrite, [](const Sink::Storage::Error &error) {
Warning() << error.message;
});
replayStoreTransaction.openDatabase().write("lastReplayedRevision", QByteArray::number(revision));
replayStoreTransaction.commit();
};
if (lastReplayedRevision < topRevision) {
Trace() << "Changereplay from " << lastReplayedRevision << " to " << topRevision;
qint64 revision = lastReplayedRevision + 1;
const auto uid = Storage::getUidFromRevision(mainStoreTransaction, revision);
const auto type = Storage::getTypeFromRevision(mainStoreTransaction, revision);
const auto key = Storage::assembleKey(uid, revision);
KAsync::Job<void> replayJob = KAsync::null<void>();
Storage::mainDatabase(mainStoreTransaction, type)
.scan(key,
[&lastReplayedRevision, type, this, &replayJob](const QByteArray &key, const QByteArray &value) -> bool {
Trace() << "Replaying " << key;
replayJob = replay(type, key, value);
// TODO make for loop async, and pass to async replay function together with type
return false;
},
[key](const Storage::Error &) { ErrorMsg() << "Failed to replay change " << key; });
return replayJob.then<void>([this, revision, recordReplayedRevision]() {
Trace() << "Replayed until " << revision;
recordReplayedRevision(revision);
//replay until we're done
replayNextRevision().exec();
},
[this, revision, recordReplayedRevision](int, QString) {
Trace() << "Change replay failed" << revision;
recordReplayedRevision(revision);
//replay until we're done
replayNextRevision().exec();
});
} else {
Trace() << "No changes to replay";
mReplayInProgress = false;
emit changesReplayed();
}
return KAsync::null<void>();
}
void ChangeReplay::revisionChanged()
{
if (!mReplayInProgress) {
replayNextRevision().exec();
}
}
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