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80 lines
2.7 KiB
80 lines
2.7 KiB
// Copyright (c) 2017-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 "merge_operator.h"
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#include <assert.h>
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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 "rocksdb/utilities/options_type.h"
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#include "utilities/cassandra/format.h"
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#include "utilities/merge_operators.h"
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namespace ROCKSDB_NAMESPACE {
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namespace cassandra {
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static std::unordered_map<std::string, OptionTypeInfo>
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merge_operator_options_info = {
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{"gc_grace_period_in_seconds",
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{offsetof(struct CassandraOptions, gc_grace_period_in_seconds),
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OptionType::kUInt32T, OptionVerificationType::kNormal,
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OptionTypeFlags::kNone}},
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{"operands_limit",
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{offsetof(struct CassandraOptions, operands_limit), OptionType::kSizeT,
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OptionVerificationType::kNormal, OptionTypeFlags::kNone}},
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};
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CassandraValueMergeOperator::CassandraValueMergeOperator(
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int32_t gc_grace_period_in_seconds, size_t operands_limit)
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: options_(gc_grace_period_in_seconds, operands_limit) {
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RegisterOptions(&options_, &merge_operator_options_info);
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}
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// Implementation for the merge operation (merges two Cassandra values)
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bool CassandraValueMergeOperator::FullMergeV2(
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const MergeOperationInput& merge_in,
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MergeOperationOutput* merge_out) const {
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// Clear the *new_value for writing.
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merge_out->new_value.clear();
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std::vector<RowValue> row_values;
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if (merge_in.existing_value) {
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row_values.push_back(RowValue::Deserialize(
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merge_in.existing_value->data(), merge_in.existing_value->size()));
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}
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for (auto& operand : merge_in.operand_list) {
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row_values.push_back(RowValue::Deserialize(operand.data(), operand.size()));
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}
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RowValue merged = RowValue::Merge(std::move(row_values));
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merged = merged.RemoveTombstones(options_.gc_grace_period_in_seconds);
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merge_out->new_value.reserve(merged.Size());
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merged.Serialize(&(merge_out->new_value));
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return true;
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}
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bool CassandraValueMergeOperator::PartialMergeMulti(
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const Slice& /*key*/, const std::deque<Slice>& operand_list,
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std::string* new_value, Logger* /*logger*/) const {
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// Clear the *new_value for writing.
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assert(new_value);
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new_value->clear();
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std::vector<RowValue> row_values;
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for (auto& operand : operand_list) {
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row_values.push_back(RowValue::Deserialize(operand.data(), operand.size()));
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}
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RowValue merged = RowValue::Merge(std::move(row_values));
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new_value->reserve(merged.Size());
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merged.Serialize(new_value);
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return true;
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}
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} // namespace cassandra
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} // namespace ROCKSDB_NAMESPACE
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