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/**
* 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
* <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 <boost/optional.hpp>
#include <string>
#include <vector>
namespace mongo {
class BSONObj;
class ChunkRange;
class KeyPattern;
class NamespaceString;
class OID;
class OperationContext;
template <typename T>
class StatusWith;
/**
* Attempts to split a chunk with the specified parameters. If the split fails, then the StatusWith
* object returned will contain a Status with an ErrorCode regarding the cause of failure. If the
* split succeeds, then the StatusWith object returned will contain Status::Ok().
* Will update the shard's filtering metadata.
*
* Additionally, splitChunk will attempt to perform top-chunk optimization. If top-chunk
* optimization is performed, then the function will also return a ChunkRange, which contains the
* range for the top chunk. Note that this ChunkRange is boost::optional, meaning that if top-chunk
* optimization is not performed, boost::none will be returned inside of the StatusWith instead.
*/
StatusWith<boost::optional<ChunkRange>> splitChunk(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& keyPatternObj,
const ChunkRange& chunkRange,
const std::vector<BSONObj>& splitKeys,
const std::string& shardName,
const OID& expectedCollectionEpoch);
} // namespace mongo
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