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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::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/client.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/repl/speculative_majority_read_info.h"
#include "mongo/util/decorable.h"
#include "mongo/util/log.h"
namespace mongo {
namespace repl {
/**
* An instance of SpeculativeReadInfo is stored as a decoration on the OperationContext, so that
* each operation can optionally utilize this structure to perform speculative reads.
*/
const OperationContext::Decoration<SpeculativeMajorityReadInfo> handle =
OperationContext::declareDecoration<SpeculativeMajorityReadInfo>();
SpeculativeMajorityReadInfo& SpeculativeMajorityReadInfo::get(OperationContext* opCtx) {
return handle(opCtx);
}
void SpeculativeMajorityReadInfo::setIsSpeculativeRead() {
_isSpeculativeRead = true;
}
bool SpeculativeMajorityReadInfo::isSpeculativeRead() const {
return _isSpeculativeRead;
}
void SpeculativeMajorityReadInfo::setSpeculativeReadOpTimeForward(const OpTime& opTime) {
invariant(_isSpeculativeRead);
// Set the optime initially if needed. Update it only if the given optime is greater.
_speculativeReadOpTime =
_speculativeReadOpTime ? std::max(*_speculativeReadOpTime, opTime) : opTime;
}
boost::optional<OpTime> SpeculativeMajorityReadInfo::getSpeculativeReadOpTime() {
invariant(_isSpeculativeRead);
return _speculativeReadOpTime;
}
} // namespace repl
} // namespace mongo
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