mirror of https://github.com/facebook/rocksdb.git
48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
// Copyright (c) 2014, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
|
|
#pragma once
|
|
#include <string>
|
|
#include "db/merge_context.h"
|
|
|
|
namespace rocksdb {
|
|
class MergeContext;
|
|
|
|
class GetContext {
|
|
public:
|
|
enum GetState {
|
|
kNotFound,
|
|
kFound,
|
|
kDeleted,
|
|
kCorrupt,
|
|
kMerge // saver contains the current merge result (the operands)
|
|
};
|
|
|
|
GetContext(const Comparator* ucmp, const MergeOperator* merge_operator,
|
|
Logger* logger, Statistics* statistics,
|
|
GetState init_state, const Slice& user_key, std::string* ret_value,
|
|
bool* value_found, MergeContext* merge_context);
|
|
|
|
void MarkKeyMayExist();
|
|
void SaveValue(const Slice& value);
|
|
bool SaveValue(const ParsedInternalKey& parsed_key, const Slice& value);
|
|
GetState State() const { return state_; }
|
|
|
|
private:
|
|
const Comparator* ucmp_;
|
|
const MergeOperator* merge_operator_;
|
|
// the merge operations encountered;
|
|
Logger* logger_;
|
|
Statistics* statistics_;
|
|
|
|
GetState state_;
|
|
Slice user_key_;
|
|
std::string* value_;
|
|
bool* value_found_; // Is value set correctly? Used by KeyMayExist
|
|
MergeContext* merge_context_;
|
|
};
|
|
|
|
} // namespace rocksdb
|