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/**
* 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/db/operation_context.h"
#include "mongo/db/repl/oplog_entry.h"
namespace mongo {
/**
* Group multiple writes into a single applyOps entry.
*/
/**
* This class is a decoration on the OperationContext holding context of writes that are logically
* related with each other. It can be used to stage writes belonging to the same WriteUnitOfWork or
* multi-document transaction. Currently only supports batching deletes in a WriteUnitOfWork.
*/
class BatchedWriteContext {
public:
static const OperationContext::Decoration<BatchedWriteContext> get;
BatchedWriteContext();
// No copy and no move
BatchedWriteContext(const BatchedWriteContext&) = delete;
BatchedWriteContext(BatchedWriteContext&&) = delete;
BatchedWriteContext& operator=(const BatchedWriteContext&) = delete;
BatchedWriteContext& operator=(BatchedWriteContext&&) = delete;
bool writesAreBatched() const;
void setWritesAreBatched(bool batched);
/**
* Adds a stored operation to the list of stored operations for the current WUOW.
* It is illegal to add operations outside of a WUOW.
* The stored operations must generate an applyOps entry that's within the max BSON size.
* Anything larger will throw a TransactionTooLarge exception at commit.
*/
void addBatchedOperation(OperationContext* opCtx, const repl::ReplOperation& operation);
// Returns a reference to the stored operations for the current WUOW.
std::vector<repl::ReplOperation>& getBatchedOperations(OperationContext* opCtx);
void clearBatchedOperations(OperationContext* opCtx);
private:
// Whether batching writes is enabled.
bool _batchWrites = false;
/**
* Holds oplog data for operations which have been applied in the current batched
* write context.
*/
std::vector<repl::ReplOperation> _batchedOperations;
};
} // namespace mongo
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