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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
commit | 19fcec84d8d7d21e796c7624e521b60d28ee21ed (patch) | |
tree | 42d26aa27d1e3f7c0b8bd3fd14e7d7082f5008dc /src/rocksdb/utilities/merge_operators/uint64add.cc | |
parent | Initial commit. (diff) | |
download | ceph-upstream.tar.xz ceph-upstream.zip |
Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/rocksdb/utilities/merge_operators/uint64add.cc')
-rw-r--r-- | src/rocksdb/utilities/merge_operators/uint64add.cc | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/src/rocksdb/utilities/merge_operators/uint64add.cc b/src/rocksdb/utilities/merge_operators/uint64add.cc new file mode 100644 index 000000000..3ef240928 --- /dev/null +++ b/src/rocksdb/utilities/merge_operators/uint64add.cc @@ -0,0 +1,69 @@ +// 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 "logging/logging.h" +#include "rocksdb/env.h" +#include "rocksdb/merge_operator.h" +#include "rocksdb/slice.h" +#include "util/coding.h" +#include "utilities/merge_operators.h" + +using namespace ROCKSDB_NAMESPACE; + +namespace { // anonymous namespace + +// A 'model' merge operator with uint64 addition semantics +// Implemented as an AssociativeMergeOperator for simplicity and example. +class UInt64AddOperator : public AssociativeMergeOperator { + public: + bool Merge(const Slice& /*key*/, const Slice* existing_value, + const Slice& value, std::string* new_value, + Logger* logger) const override { + uint64_t orig_value = 0; + if (existing_value){ + orig_value = DecodeInteger(*existing_value, logger); + } + uint64_t operand = DecodeInteger(value, logger); + + assert(new_value); + new_value->clear(); + PutFixed64(new_value, orig_value + operand); + + return true; // Return true always since corruption will be treated as 0 + } + + const char* Name() const override { return "UInt64AddOperator"; } + + private: + // Takes the string and decodes it into a uint64_t + // On error, prints a message and returns 0 + uint64_t DecodeInteger(const Slice& value, Logger* logger) const { + uint64_t result = 0; + + if (value.size() == sizeof(uint64_t)) { + result = DecodeFixed64(value.data()); + } else if (logger != nullptr) { + // If value is corrupted, treat it as 0 + ROCKS_LOG_ERROR(logger, "uint64 value corruption, size: %" ROCKSDB_PRIszt + " > %" ROCKSDB_PRIszt, + value.size(), sizeof(uint64_t)); + } + + return result; + } + +}; + +} + +namespace ROCKSDB_NAMESPACE { + +std::shared_ptr<MergeOperator> MergeOperators::CreateUInt64AddOperator() { + return std::make_shared<UInt64AddOperator>(); +} + +} // namespace ROCKSDB_NAMESPACE |