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+/**
+ * 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