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