rocksdb/table/get_context.h

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// 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