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rocksdb/utilities/merge_operators/cassandra/merge_operator.h

39 lines
1.5 KiB

// Copyright (c) 2017-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
// This source code is also licensed under the GPLv2 license found in the
// COPYING file in the root directory of this source tree.
#pragma once
#include "rocksdb/merge_operator.h"
#include "rocksdb/slice.h"
namespace rocksdb {
namespace cassandra {
/**
* A MergeOperator for rocksdb that implements Cassandra row value merge.
*/
class CassandraValueMergeOperator : public MergeOperator {
public:
static std::shared_ptr<MergeOperator> CreateSharedInstance();
virtual bool FullMergeV2(const MergeOperationInput& merge_in,
MergeOperationOutput* merge_out) const override;
virtual bool PartialMerge(const Slice& key,
const Slice& left_operand,
const Slice& right_operand,
std::string* new_value,
Logger* logger) const override;
virtual bool PartialMergeMulti(const Slice& key,
const std::deque<Slice>& operand_list,
std::string* new_value,
Logger* logger) const override;
virtual const char* Name() const override;
};
} // namespace cassandra
} // namespace rocksdb