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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
commit | e6918187568dbd01842d8d1d2c808ce16a894239 (patch) | |
tree | 64f88b554b444a49f656b6c656111a145cbbaa28 /src/rocksdb/utilities/merge_operators/put.cc | |
parent | Initial commit. (diff) | |
download | ceph-e6918187568dbd01842d8d1d2c808ce16a894239.tar.xz ceph-e6918187568dbd01842d8d1d2c808ce16a894239.zip |
Adding upstream version 18.2.2.upstream/18.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/rocksdb/utilities/merge_operators/put.cc | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/rocksdb/utilities/merge_operators/put.cc b/src/rocksdb/utilities/merge_operators/put.cc new file mode 100644 index 000000000..ccf9ff21f --- /dev/null +++ b/src/rocksdb/utilities/merge_operators/put.cc @@ -0,0 +1,92 @@ +// Copyright (c) 2011-present, Facebook, Inc. All rights reserved. +// This source code is licensed under both the GPLv2 (found in the +// COPYING file in the root directory) and Apache 2.0 License +// (found in the LICENSE.Apache file in the root directory). + +#include <memory> + +#include "rocksdb/merge_operator.h" +#include "rocksdb/slice.h" +#include "utilities/merge_operators.h" + +namespace { // anonymous namespace + +using ROCKSDB_NAMESPACE::Logger; +using ROCKSDB_NAMESPACE::MergeOperator; +using ROCKSDB_NAMESPACE::Slice; + +// A merge operator that mimics Put semantics +// Since this merge-operator will not be used in production, +// it is implemented as a non-associative merge operator to illustrate the +// new interface and for testing purposes. (That is, we inherit from +// the MergeOperator class rather than the AssociativeMergeOperator +// which would be simpler in this case). +// +// From the client-perspective, semantics are the same. +class PutOperator : public MergeOperator { + public: + bool FullMerge(const Slice& /*key*/, const Slice* /*existing_value*/, + const std::deque<std::string>& operand_sequence, + std::string* new_value, Logger* /*logger*/) const override { + // Put basically only looks at the current/latest value + assert(!operand_sequence.empty()); + assert(new_value != nullptr); + new_value->assign(operand_sequence.back()); + return true; + } + + bool PartialMerge(const Slice& /*key*/, const Slice& /*left_operand*/, + const Slice& right_operand, std::string* new_value, + Logger* /*logger*/) const override { + new_value->assign(right_operand.data(), right_operand.size()); + return true; + } + + using MergeOperator::PartialMergeMulti; + bool PartialMergeMulti(const Slice& /*key*/, + const std::deque<Slice>& operand_list, + std::string* new_value, + Logger* /*logger*/) const override { + new_value->assign(operand_list.back().data(), operand_list.back().size()); + return true; + } + + static const char* kClassName() { return "PutOperator"; } + static const char* kNickName() { return "put_v1"; } + const char* Name() const override { return kClassName(); } + const char* NickName() const override { return kNickName(); } +}; + +class PutOperatorV2 : public PutOperator { + bool FullMerge(const Slice& /*key*/, const Slice* /*existing_value*/, + const std::deque<std::string>& /*operand_sequence*/, + std::string* /*new_value*/, + Logger* /*logger*/) const override { + assert(false); + return false; + } + + bool FullMergeV2(const MergeOperationInput& merge_in, + MergeOperationOutput* merge_out) const override { + // Put basically only looks at the current/latest value + assert(!merge_in.operand_list.empty()); + merge_out->existing_operand = merge_in.operand_list.back(); + return true; + } + + static const char* kNickName() { return "put"; } + const char* NickName() const override { return kNickName(); } +}; + +} // end of anonymous namespace + +namespace ROCKSDB_NAMESPACE { + +std::shared_ptr<MergeOperator> MergeOperators::CreateDeprecatedPutOperator() { + return std::make_shared<PutOperator>(); +} + +std::shared_ptr<MergeOperator> MergeOperators::CreatePutOperator() { + return std::make_shared<PutOperatorV2>(); +} +} // namespace ROCKSDB_NAMESPACE |