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author | Kevin Pulo <kevin.pulo@mongodb.com> | 2020-04-16 14:45:53 +1000 |
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committer | Evergreen Agent <no-reply@evergreen.mongodb.com> | 2020-05-12 13:08:08 +0000 |
commit | 94ff51257a099ee6af4a9c41ee61245918227760 (patch) | |
tree | 5d5f880fb4708cb65abf9e369f0f022aa6d6d0c4 /src/mongo/db/vector_clock_trivial.cpp | |
parent | 14bb6a661fc7a8b693613203693b8232c6f91944 (diff) | |
download | mongo-94ff51257a099ee6af4a9c41ee61245918227760.tar.gz |
SERVER-46200 implement basic VectorClock service
Diffstat (limited to 'src/mongo/db/vector_clock_trivial.cpp')
-rw-r--r-- | src/mongo/db/vector_clock_trivial.cpp | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/src/mongo/db/vector_clock_trivial.cpp b/src/mongo/db/vector_clock_trivial.cpp new file mode 100644 index 00000000000..88f00a512ea --- /dev/null +++ b/src/mongo/db/vector_clock_trivial.cpp @@ -0,0 +1,100 @@ +/** + * Copyright (C) 2020-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. + */ + +#include "mongo/platform/basic.h" + +#include "mongo/db/vector_clock_mutable.h" + +namespace mongo { +namespace { + +/** + * Vector clock implementation for non-distributed environments (embedded, some unittests). + */ +class VectorClockTrivial : public VectorClockMutable { + VectorClockTrivial(const VectorClockTrivial&) = delete; + VectorClockTrivial& operator=(const VectorClockTrivial&) = delete; + +public: + VectorClockTrivial(); + virtual ~VectorClockTrivial(); + + LogicalTime tick(Component component, uint64_t nTicks) override; + void tickTo(Component component, LogicalTime newTime) override; + +protected: + void _gossipOutInternal(BSONObjBuilder* out) const override; + void _gossipOutExternal(BSONObjBuilder* out) const override; + LogicalTimeArray _gossipInInternal(const BSONObj& in) override; + LogicalTimeArray _gossipInExternal(const BSONObj& in) override; +}; + +const auto vectorClockTrivialDecoration = ServiceContext::declareDecoration<VectorClockTrivial>(); + +ServiceContext::ConstructorActionRegisterer _registerer( + "VectorClockTrivial-VectorClockRegistration", + {}, + [](ServiceContext* service) { + VectorClockTrivial::registerVectorClockOnServiceContext( + service, &vectorClockTrivialDecoration(service)); + }, + {}); + +VectorClockTrivial::VectorClockTrivial() = default; + +VectorClockTrivial::~VectorClockTrivial() = default; + +void VectorClockTrivial::_gossipOutInternal(BSONObjBuilder* out) const { + // Clocks are not gossipped in trivial (non-distributed) environments. +} + +void VectorClockTrivial::_gossipOutExternal(BSONObjBuilder* out) const { + // Clocks are not gossipped in trivial (non-distributed) environments. +} + +VectorClock::LogicalTimeArray VectorClockTrivial::_gossipInInternal(const BSONObj& in) { + // Clocks are not gossipped in trivial (non-distributed) environments. + return {}; +} + +VectorClock::LogicalTimeArray VectorClockTrivial::_gossipInExternal(const BSONObj& in) { + // Clocks are not gossipped in trivial (non-distributed) environments. + return {}; +} + +LogicalTime VectorClockTrivial::tick(Component component, uint64_t nTicks) { + return _advanceComponentTimeByTicks(component, nTicks); +} + +void VectorClockTrivial::tickTo(Component component, LogicalTime newTime) { + _advanceComponentTimeTo(component, std::move(newTime)); +} + +} // namespace +} // namespace mongo |