diff options
Diffstat (limited to 'src/mongo/db/s/database_sharding_state.cpp')
-rw-r--r-- | src/mongo/db/s/database_sharding_state.cpp | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/src/mongo/db/s/database_sharding_state.cpp b/src/mongo/db/s/database_sharding_state.cpp new file mode 100644 index 00000000000..40a630bc5b4 --- /dev/null +++ b/src/mongo/db/s/database_sharding_state.cpp @@ -0,0 +1,85 @@ +/** + * Copyright (C) 2018 MongoDB Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License, version 3, + * as published by the Free Software Foundation. + * + * 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 + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * 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 GNU Affero General 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/s/database_sharding_state.h" + +#include "mongo/db/operation_context.h" + +namespace mongo { +const Database::Decoration<DatabaseShardingState> DatabaseShardingState::get = + Database::declareDecorationWithOwner<DatabaseShardingState>(); + +DatabaseShardingState::DatabaseShardingState(Database* db) : _db(db) {} + +void DatabaseShardingState::enterCriticalSection(OperationContext* opCtx) { + invariant(opCtx->lockState()->isDbLockedForMode(_db->name(), MODE_X)); + invariant(!_critSecSignal); + _critSecSignal = std::make_shared<Notification<void>>(); + // TODO (SERVER-33313): call CursorManager::invalidateAll() on all collections in this database + // with 'fromMovePrimary=true' and a predicate to only invalidate the cursor if the opCtx on its + // PlanExecutor has a client dbVersion. +} + +void DatabaseShardingState::exitCriticalSection(OperationContext* opCtx, + boost::optional<DatabaseVersion> newDbVersion) { + invariant(opCtx->lockState()->isDbLockedForMode(_db->name(), MODE_X)); + invariant(_critSecSignal); + _critSecSignal->set(); + _critSecSignal.reset(); + _dbVersion = newDbVersion; +} + +std::shared_ptr<Notification<void>> DatabaseShardingState::getCriticalSectionSignal() const { + return _critSecSignal; +} + +void DatabaseShardingState::setDbVersion(OperationContext* opCtx, + boost::optional<DatabaseVersion> newDbVersion) { + invariant(opCtx->lockState()->isDbLockedForMode(_db->name(), MODE_X)); + _dbVersion = newDbVersion; +} + +void DatabaseShardingState::checkDbVersion(OperationContext* opCtx) const { + invariant(opCtx->lockState()->isLocked()); + + if (_critSecSignal) { + // TODO (SERVER-33097): Set movePrimary critical section signal on the + // OperationShardingState (so that the operation can wait outside the DBLock for the + // movePrimary critical section to end before returning to the client). + + // TODO (SERVER-33098): throw StaleDbVersion. + } + + // TODO (SERVER-33098): check the client's dbVersion (from the OperationShardingState) against + // _dbVersion, and throw StaleDbVersion if they don't match. + return; +} + +} // namespace mongo |