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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
75 lines
2.8 KiB
C++
75 lines
2.8 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/put_operator.h"
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namespace ROCKSDB_NAMESPACE {
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// A merge operator that mimics Put semantics
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// Since this merge-operator will not be used in production,
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// it is implemented as a non-associative merge operator to illustrate the
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// new interface and for testing purposes. (That is, we inherit from
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// the MergeOperator class rather than the AssociativeMergeOperator
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// which would be simpler in this case).
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//
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// From the client-perspective, semantics are the same.
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bool PutOperator::FullMerge(const Slice& /*key*/,
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const Slice* /*existing_value*/,
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const std::deque<std::string>& operand_sequence,
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std::string* new_value, Logger* /*logger*/) const {
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// Put basically only looks at the current/latest value
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assert(!operand_sequence.empty());
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assert(new_value != nullptr);
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new_value->assign(operand_sequence.back());
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return true;
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}
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bool PutOperator::PartialMerge(const Slice& /*key*/,
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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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new_value->assign(right_operand.data(), right_operand.size());
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return true;
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}
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bool PutOperator::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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new_value->assign(operand_list.back().data(), operand_list.back().size());
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return true;
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}
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bool PutOperatorV2::FullMerge(
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const Slice& /*key*/, const Slice* /*existing_value*/,
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const std::deque<std::string>& /*operand_sequence*/,
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std::string* /*new_value*/, Logger* /*logger*/) const {
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assert(false);
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return false;
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}
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bool PutOperatorV2::FullMergeV2(const MergeOperationInput& merge_in,
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MergeOperationOutput* merge_out) const {
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// Put basically only looks at the current/latest value
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assert(!merge_in.operand_list.empty());
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merge_out->existing_operand = merge_in.operand_list.back();
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return true;
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}
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std::shared_ptr<MergeOperator> MergeOperators::CreateDeprecatedPutOperator() {
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return std::make_shared<PutOperator>();
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}
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std::shared_ptr<MergeOperator> MergeOperators::CreatePutOperator() {
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return std::make_shared<PutOperatorV2>();
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}
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} // namespace ROCKSDB_NAMESPACE
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