fork of https://github.com/rust-rocksdb/rust-rocksdb for nextgraph
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
36 lines
1.3 KiB
36 lines
1.3 KiB
1 year ago
|
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
||
|
|
// This source code is licensed under both the GPLv2 (found in the
|
||
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
||
|
|
// (found in the LICENSE.Apache file in the root directory).
|
||
|
|
//
|
||
|
|
// Merge operator that picks the maximum operand, Comparison is based on
|
||
|
|
// Slice::compare
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include "rocksdb/merge_operator.h"
|
||
|
|
|
||
|
|
namespace ROCKSDB_NAMESPACE {
|
||
|
|
class Logger;
|
||
|
|
class Slice;
|
||
|
|
|
||
|
|
class MaxOperator : public MergeOperator {
|
||
|
|
public:
|
||
|
|
static const char* kClassName() { return "MaxOperator"; }
|
||
|
|
static const char* kNickName() { return "max"; }
|
||
|
|
const char* Name() const override { return kClassName(); }
|
||
|
|
const char* NickName() const override { return kNickName(); }
|
||
|
|
|
||
|
|
bool FullMergeV2(const MergeOperationInput& merge_in,
|
||
|
|
MergeOperationOutput* merge_out) const override;
|
||
|
|
bool PartialMerge(const Slice& /*key*/, const Slice& left_operand,
|
||
|
|
const Slice& right_operand, std::string* new_value,
|
||
|
|
Logger* /*logger*/) const override;
|
||
|
|
bool PartialMergeMulti(const Slice& /*key*/,
|
||
|
|
const std::deque<Slice>& operand_list,
|
||
|
|
std::string* new_value,
|
||
|
|
Logger* /*logger*/) const override;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace ROCKSDB_NAMESPACE
|