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.
32 lines
1.0 KiB
32 lines
1.0 KiB
/**
|
|
* A MergeOperator for rocksdb that implements string append.
|
|
* @author Deon Nicholas (dnicholas@fb.com)
|
|
* Copyright 2013 Facebook
|
|
*/
|
|
|
|
#pragma once
|
|
#include "rocksdb/merge_operator.h"
|
|
#include "rocksdb/slice.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
class StringAppendOperator : public AssociativeMergeOperator {
|
|
public:
|
|
// Constructor: specify delimiter
|
|
explicit StringAppendOperator(char delim_char);
|
|
explicit StringAppendOperator(const std::string& delim);
|
|
|
|
virtual bool Merge(const Slice& key, const Slice* existing_value,
|
|
const Slice& value, std::string* new_value,
|
|
Logger* logger) const override;
|
|
|
|
static const char* kClassName() { return "StringAppendOperator"; }
|
|
static const char* kNickName() { return "stringappend"; }
|
|
virtual const char* Name() const override { return kClassName(); }
|
|
virtual const char* NickName() const override { return kNickName(); }
|
|
|
|
private:
|
|
std::string delim_; // The delimiter is inserted between elements
|
|
};
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|
|
|