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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kStorage
#include "mongo/platform/basic.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_snapshot_manager.h"
#include "mongo/db/server_options.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_begin_transaction_block.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_oplog_manager.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_util.h"
#include "mongo/util/log.h"
namespace mongo {
void WiredTigerSnapshotManager::setCommittedSnapshot(const Timestamp& timestamp) {
stdx::lock_guard<stdx::mutex> lock(_committedSnapshotMutex);
invariant(!_committedSnapshot || *_committedSnapshot <= timestamp);
_committedSnapshot = timestamp;
}
void WiredTigerSnapshotManager::setLocalSnapshot(const Timestamp& timestamp) {
stdx::lock_guard<stdx::mutex> lock(_localSnapshotMutex);
_localSnapshot = timestamp;
}
boost::optional<Timestamp> WiredTigerSnapshotManager::getLocalSnapshot() {
stdx::lock_guard<stdx::mutex> lock(_localSnapshotMutex);
return _localSnapshot;
}
void WiredTigerSnapshotManager::dropAllSnapshots() {
stdx::lock_guard<stdx::mutex> lock(_committedSnapshotMutex);
_committedSnapshot = boost::none;
}
boost::optional<Timestamp> WiredTigerSnapshotManager::getMinSnapshotForNextCommittedRead() const {
if (!serverGlobalParams.enableMajorityReadConcern) {
return boost::none;
}
stdx::lock_guard<stdx::mutex> lock(_committedSnapshotMutex);
return _committedSnapshot;
}
Timestamp WiredTigerSnapshotManager::beginTransactionOnCommittedSnapshot(
WT_SESSION* session, WiredTigerBeginTxnBlock::IgnorePrepared ignorePrepared) const {
WiredTigerBeginTxnBlock txnOpen(session, ignorePrepared);
stdx::lock_guard<stdx::mutex> lock(_committedSnapshotMutex);
uassert(ErrorCodes::ReadConcernMajorityNotAvailableYet,
"Committed view disappeared while running operation",
_committedSnapshot);
auto status = txnOpen.setTimestamp(_committedSnapshot.get());
fassert(30635, status);
txnOpen.done();
return *_committedSnapshot;
}
Timestamp WiredTigerSnapshotManager::beginTransactionOnLocalSnapshot(
WT_SESSION* session, WiredTigerBeginTxnBlock::IgnorePrepared ignorePrepared) const {
WiredTigerBeginTxnBlock txnOpen(session, ignorePrepared);
stdx::lock_guard<stdx::mutex> lock(_localSnapshotMutex);
invariant(_localSnapshot);
LOG(3) << "begin_transaction on local snapshot " << _localSnapshot.get().toString();
auto status = txnOpen.setTimestamp(_localSnapshot.get());
fassert(50775, status);
txnOpen.done();
return *_localSnapshot;
}
} // namespace mongo
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