1f2dca0eaa
Summary: Introduce MaxOperator a simple merge operator that return the max of all operands. This merge operand help me in benchmarking Test Plan: Add new unitttests Reviewers: sdong, andrewkr, yhchiang Reviewed By: yhchiang Subscribers: andrewkr, dhruba Differential Revision: https://reviews.facebook.net/D57873
49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
// Copyright (c) 2011-present, 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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//
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#ifndef MERGE_OPERATORS_H
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#define MERGE_OPERATORS_H
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#include <memory>
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#include <stdio.h>
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#include "rocksdb/merge_operator.h"
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namespace rocksdb {
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class MergeOperators {
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public:
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static std::shared_ptr<MergeOperator> CreatePutOperator();
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static std::shared_ptr<MergeOperator> CreateUInt64AddOperator();
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static std::shared_ptr<MergeOperator> CreateStringAppendOperator();
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static std::shared_ptr<MergeOperator> CreateStringAppendTESTOperator();
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static std::shared_ptr<MergeOperator> CreateMaxOperator();
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// Will return a different merge operator depending on the string.
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// TODO: Hook the "name" up to the actual Name() of the MergeOperators?
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static std::shared_ptr<MergeOperator> CreateFromStringId(
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const std::string& name) {
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if (name == "put") {
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return CreatePutOperator();
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} else if ( name == "uint64add") {
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return CreateUInt64AddOperator();
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} else if (name == "stringappend") {
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return CreateStringAppendOperator();
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} else if (name == "stringappendtest") {
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return CreateStringAppendTESTOperator();
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} else if (name == "max") {
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return CreateMaxOperator();
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} else {
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// Empty or unknown, just return nullptr
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return nullptr;
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}
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}
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};
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} // namespace rocksdb
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#endif
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