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// 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 "rocksdb/sst_partitioner.h"
#include <algorithm>
#include "rocksdb/utilities/customizable_util.h"
#include "rocksdb/utilities/object_registry.h"
#include "rocksdb/utilities/options_type.h"
namespace ROCKSDB_NAMESPACE {
static std::unordered_map<std::string, OptionTypeInfo>
sst_fixed_prefix_type_info = {
#ifndef ROCKSDB_LITE
{"length",
{0, OptionType::kSizeT, OptionVerificationType::kNormal,
OptionTypeFlags::kNone}},
#endif // ROCKSDB_LITE
};
SstPartitionerFixedPrefixFactory::SstPartitionerFixedPrefixFactory(size_t len)
: len_(len) {
RegisterOptions("Length", &len_, &sst_fixed_prefix_type_info);
}
PartitionerResult SstPartitionerFixedPrefix::ShouldPartition(
const PartitionerRequest& request) {
Slice last_key_fixed(*request.prev_user_key);
if (last_key_fixed.size() > len_) {
last_key_fixed.size_ = len_;
}
Slice current_key_fixed(*request.current_user_key);
if (current_key_fixed.size() > len_) {
current_key_fixed.size_ = len_;
}
return last_key_fixed.compare(current_key_fixed) != 0 ? kRequired
: kNotRequired;
}
bool SstPartitionerFixedPrefix::CanDoTrivialMove(
const Slice& smallest_user_key, const Slice& largest_user_key) {
return ShouldPartition(PartitionerRequest(smallest_user_key, largest_user_key,
0)) == kNotRequired;
}
std::unique_ptr<SstPartitioner>
SstPartitionerFixedPrefixFactory::CreatePartitioner(
const SstPartitioner::Context& /* context */) const {
return std::unique_ptr<SstPartitioner>(new SstPartitionerFixedPrefix(len_));
}
std::shared_ptr<SstPartitionerFactory> NewSstPartitionerFixedPrefixFactory(
size_t prefix_len) {
return std::make_shared<SstPartitionerFixedPrefixFactory>(prefix_len);
}
#ifndef ROCKSDB_LITE
namespace {
static int RegisterSstPartitionerFactories(ObjectLibrary& library,
const std::string& /*arg*/) {
library.AddFactory<SstPartitionerFactory>(
SstPartitionerFixedPrefixFactory::kClassName(),
[](const std::string& /*uri*/,
std::unique_ptr<SstPartitionerFactory>* guard,
std::string* /* errmsg */) {
guard->reset(new SstPartitionerFixedPrefixFactory(0));
return guard->get();
});
return 1;
}
} // namespace
#endif // ROCKSDB_LITE
Status SstPartitionerFactory::CreateFromString(
const ConfigOptions& options, const std::string& value,
std::shared_ptr<SstPartitionerFactory>* result) {
#ifndef ROCKSDB_LITE
static std::once_flag once;
std::call_once(once, [&]() {
RegisterSstPartitionerFactories(*(ObjectLibrary::Default().get()), "");
});
#endif // ROCKSDB_LITE
return LoadSharedObject<SstPartitionerFactory>(options, value, nullptr,
result);
}
} // namespace ROCKSDB_NAMESPACE
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