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// 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
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