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Diffstat (limited to 'src/mongo/s/shard_version.h')
-rw-r--r-- | src/mongo/s/shard_version.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/mongo/s/shard_version.h b/src/mongo/s/shard_version.h new file mode 100644 index 00000000000..f49cb10f83a --- /dev/null +++ b/src/mongo/s/shard_version.h @@ -0,0 +1,70 @@ +/** + * Copyright (C) 2022-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. + */ +#pragma once + +#include "mongo/s/chunk_version_gen.h" + +namespace mongo { + +/** + * This class is used to represent the shard version of a collection. + * + * It contains the chunk placement information through the ChunkVersion. This class is used for + * network requests and the shard versioning protocol. + * + */ +class ShardVersion : public ChunkVersion { +public: + /** + * The name for the shard version information field, which shard-aware commands should include + * if they want to convey shard version. + */ + static constexpr StringData kShardVersionField = "shardVersion"_sd; + + ShardVersion(ChunkVersion chunkVersion) : ChunkVersion(chunkVersion) {} + + ShardVersion() : ShardVersion(ChunkVersion()) {} + + static ShardVersion parse(const BSONElement& element) { + auto parsedVersion = + ChunkVersion60Format::parse(IDLParserContext("ShardVersion"), element.Obj()); + auto version = parsedVersion.getVersion(); + return ShardVersion(ChunkVersion({parsedVersion.getEpoch(), parsedVersion.getTimestamp()}, + {version.getSecs(), version.getInc()})); + } + + void serialize(StringData field, BSONObjBuilder* builder) const { + ChunkVersion60Format version; + version.setGeneration({_epoch, _timestamp}); + version.setPlacement(Timestamp(majorVersion(), minorVersion())); + builder->append(field, version.toBSON()); + } +}; + +} // namespace mongo |