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https://github.com/facebook/rocksdb.git
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b6640c3117
Summary: The primary purpose of the FactoryFunc was to support LITE mode where the ObjectRegistry was not available. With the removal of LITE mode, the function was no longer required. Note that the MergeOperator had some private classes defined in header files. To gain access to their constructors (and name methods), the class definitions were moved into header files. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11203 Reviewed By: cbi42 Differential Revision: D43160255 Pulled By: pdillinger fbshipit-source-id: f3a465fd5d1a7049b73ecf31e4b8c3762f6dae6c
65 lines
2 KiB
C++
65 lines
2 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include <memory>
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#include "rocksdb/merge_operator.h"
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#include "rocksdb/slice.h"
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#include "utilities/merge_operators.h"
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#include "utilities/merge_operators/max_operator.h"
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namespace ROCKSDB_NAMESPACE {
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bool MaxOperator::FullMergeV2(const MergeOperationInput& merge_in,
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MergeOperationOutput* merge_out) const {
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Slice& max = merge_out->existing_operand;
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if (merge_in.existing_value) {
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max =
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Slice(merge_in.existing_value->data(), merge_in.existing_value->size());
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} else if (max.data() == nullptr) {
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max = Slice();
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}
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for (const auto& op : merge_in.operand_list) {
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if (max.compare(op) < 0) {
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max = op;
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}
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}
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return true;
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}
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bool MaxOperator::PartialMerge(const Slice& /*key*/, const Slice& left_operand,
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const Slice& right_operand,
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std::string* new_value,
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Logger* /*logger*/) const {
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if (left_operand.compare(right_operand) >= 0) {
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new_value->assign(left_operand.data(), left_operand.size());
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} else {
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new_value->assign(right_operand.data(), right_operand.size());
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}
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return true;
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}
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bool MaxOperator::PartialMergeMulti(const Slice& /*key*/,
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const std::deque<Slice>& operand_list,
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std::string* new_value,
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Logger* /*logger*/) const {
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Slice max;
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for (const auto& operand : operand_list) {
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if (max.compare(operand) < 0) {
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max = operand;
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}
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}
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new_value->assign(max.data(), max.size());
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return true;
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}
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std::shared_ptr<MergeOperator> MergeOperators::CreateMaxOperator() {
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return std::make_shared<MaxOperator>();
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}
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} // namespace ROCKSDB_NAMESPACE
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