/** * 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 * . * * 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. */ #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" #define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kReplication 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 handle = OperationContext::declareDecoration(); SpeculativeMajorityReadInfo& SpeculativeMajorityReadInfo::get(OperationContext* opCtx) { return handle(opCtx); } void SpeculativeMajorityReadInfo::setIsSpeculativeRead() { _isSpeculativeRead = true; } bool SpeculativeMajorityReadInfo::isSpeculativeRead() const { return _isSpeculativeRead; } void SpeculativeMajorityReadInfo::setSpeculativeReadTimestampForward(const Timestamp& ts) { invariant(_isSpeculativeRead); // Set the timestamp initially if needed. Update it only if the given timestamp is greater. _speculativeReadTimestamp = _speculativeReadTimestamp ? std::max(*_speculativeReadTimestamp, ts) : ts; } boost::optional SpeculativeMajorityReadInfo::getSpeculativeReadTimestamp() { invariant(_isSpeculativeRead); return _speculativeReadTimestamp; } } // namespace repl } // namespace mongo