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Diffstat (limited to 'src/rocksdb/utilities/cassandra/merge_operator.cc')
-rw-r--r-- | src/rocksdb/utilities/cassandra/merge_operator.cc | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/src/rocksdb/utilities/cassandra/merge_operator.cc b/src/rocksdb/utilities/cassandra/merge_operator.cc new file mode 100644 index 000000000..bde5dcbad --- /dev/null +++ b/src/rocksdb/utilities/cassandra/merge_operator.cc @@ -0,0 +1,82 @@ +// Copyright (c) 2017-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 "merge_operator.h" + +#include <assert.h> + +#include <memory> + +#include "rocksdb/merge_operator.h" +#include "rocksdb/slice.h" +#include "rocksdb/utilities/options_type.h" +#include "utilities/cassandra/format.h" +#include "utilities/merge_operators.h" + +namespace ROCKSDB_NAMESPACE { +namespace cassandra { +static std::unordered_map<std::string, OptionTypeInfo> + merge_operator_options_info = { +#ifndef ROCKSDB_LITE + {"gc_grace_period_in_seconds", + {offsetof(struct CassandraOptions, gc_grace_period_in_seconds), + OptionType::kUInt32T, OptionVerificationType::kNormal, + OptionTypeFlags::kNone}}, + {"operands_limit", + {offsetof(struct CassandraOptions, operands_limit), OptionType::kSizeT, + OptionVerificationType::kNormal, OptionTypeFlags::kNone}}, +#endif // ROCKSDB_LITE +}; + +CassandraValueMergeOperator::CassandraValueMergeOperator( + int32_t gc_grace_period_in_seconds, size_t operands_limit) + : options_(gc_grace_period_in_seconds, operands_limit) { + RegisterOptions(&options_, &merge_operator_options_info); +} + +// Implementation for the merge operation (merges two Cassandra values) +bool CassandraValueMergeOperator::FullMergeV2( + const MergeOperationInput& merge_in, + MergeOperationOutput* merge_out) const { + // Clear the *new_value for writing. + merge_out->new_value.clear(); + std::vector<RowValue> row_values; + if (merge_in.existing_value) { + row_values.push_back(RowValue::Deserialize( + merge_in.existing_value->data(), merge_in.existing_value->size())); + } + + for (auto& operand : merge_in.operand_list) { + row_values.push_back(RowValue::Deserialize(operand.data(), operand.size())); + } + + RowValue merged = RowValue::Merge(std::move(row_values)); + merged = merged.RemoveTombstones(options_.gc_grace_period_in_seconds); + merge_out->new_value.reserve(merged.Size()); + merged.Serialize(&(merge_out->new_value)); + + return true; +} + +bool CassandraValueMergeOperator::PartialMergeMulti( + const Slice& /*key*/, const std::deque<Slice>& operand_list, + std::string* new_value, Logger* /*logger*/) const { + // Clear the *new_value for writing. + assert(new_value); + new_value->clear(); + + std::vector<RowValue> row_values; + for (auto& operand : operand_list) { + row_values.push_back(RowValue::Deserialize(operand.data(), operand.size())); + } + RowValue merged = RowValue::Merge(std::move(row_values)); + new_value->reserve(merged.Size()); + merged.Serialize(new_value); + return true; +} + +} // namespace cassandra + +} // namespace ROCKSDB_NAMESPACE |