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