fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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42 lines
1.6 KiB
42 lines
1.6 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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// A MergeOperator for RocksDB that implements Merge Sort.
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// It is built using the MergeOperator interface. The operator works by taking
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// an input which contains one or more merge operands where each operand is a
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// list of sorted ints and merges them to form a large sorted list.
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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_NAMESPACE {
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class SortList : public MergeOperator {
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public:
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bool FullMergeV2(const MergeOperationInput& merge_in,
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MergeOperationOutput* merge_out) const override;
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bool PartialMerge(const Slice& /*key*/, const Slice& left_operand,
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const Slice& right_operand, std::string* new_value,
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Logger* /*logger*/) const override;
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bool PartialMergeMulti(const Slice& key,
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const std::deque<Slice>& operand_list,
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std::string* new_value, Logger* logger) const override;
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static const char* kClassName() { return "MergeSortOperator"; }
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static const char* kNickName() { return "sortlist"; }
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const char* Name() const override { return kClassName(); }
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const char* NickName() const override { return kNickName(); }
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void MakeVector(std::vector<int>& operand, Slice slice) const;
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private:
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std::vector<int> Merge(std::vector<int>& left, std::vector<int>& right) const;
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};
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} // namespace ROCKSDB_NAMESPACE
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