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.
52 lines
2.0 KiB
52 lines
2.0 KiB
// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
|
|
/**
|
|
* A TEST MergeOperator for rocksdb that implements string append.
|
|
* It is built using the MergeOperator interface rather than the simpler
|
|
* AssociativeMergeOperator interface. This is useful for testing/benchmarking.
|
|
* While the two operators are semantically the same, all production code
|
|
* should use the StringAppendOperator defined in stringappend.{h,cc}. The
|
|
* operator defined in the present file is primarily for testing.
|
|
*
|
|
* @author Deon Nicholas (dnicholas@fb.com)
|
|
* Copyright 2013 Facebook
|
|
*/
|
|
|
|
#pragma once
|
|
#include <deque>
|
|
#include <string>
|
|
|
|
#include "rocksdb/merge_operator.h"
|
|
#include "rocksdb/slice.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
class StringAppendTESTOperator : public MergeOperator {
|
|
public:
|
|
// Constructor with delimiter
|
|
explicit StringAppendTESTOperator(char delim_char);
|
|
explicit StringAppendTESTOperator(const std::string& delim);
|
|
|
|
virtual bool FullMergeV2(const MergeOperationInput& merge_in,
|
|
MergeOperationOutput* merge_out) const override;
|
|
|
|
virtual bool PartialMergeMulti(const Slice& key,
|
|
const std::deque<Slice>& operand_list,
|
|
std::string* new_value,
|
|
Logger* logger) const override;
|
|
|
|
static const char* kClassName() { return "StringAppendTESTOperator"; }
|
|
static const char* kNickName() { return "stringappendtest"; }
|
|
const char* Name() const override { return kClassName(); }
|
|
const char* NickName() const override { return kNickName(); }
|
|
|
|
private:
|
|
// A version of PartialMerge that actually performs "partial merging".
|
|
// Use this to simulate the exact behaviour of the StringAppendOperator.
|
|
bool _AssocPartialMergeMulti(const Slice& key,
|
|
const std::deque<Slice>& operand_list,
|
|
std::string* new_value, Logger* logger) const;
|
|
|
|
std::string delim_; // The delimiter is inserted between elements
|
|
};
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|
|
|