fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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61 lines
2.5 KiB
61 lines
2.5 KiB
10 years ago
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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#ifndef ROCKSDB_LITE
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#include "table/cuckoo_table_factory.h"
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#include "db/dbformat.h"
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#include "table/cuckoo_table_builder.h"
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#include "table/cuckoo_table_reader.h"
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#include "util/murmurhash.h"
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namespace rocksdb {
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extern const uint32_t kMaxNumHashTable = 64;
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extern uint64_t GetSliceMurmurHash(const Slice& s, uint32_t index,
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uint64_t max_num_buckets) {
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static constexpr uint32_t seeds[kMaxNumHashTable] = {
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816922183, 506425713, 949485004, 22513986, 421427259, 500437285,
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888981693, 847587269, 511007211, 722295391, 934013645, 566947683,
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193618736, 428277388, 770956674, 819994962, 755946528, 40807421,
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263144466, 241420041, 444294464, 731606396, 304158902, 563235655,
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968740453, 336996831, 462831574, 407970157, 985877240, 637708754,
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736932700, 205026023, 755371467, 729648411, 807744117, 46482135,
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847092855, 620960699, 102476362, 314094354, 625838942, 550889395,
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639071379, 834567510, 397667304, 151945969, 443634243, 196618243,
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421986347, 407218337, 964502417, 327741231, 493359459, 452453139,
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692216398, 108161624, 816246924, 234779764, 618949448, 496133787,
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156374056, 316589799, 982915425, 553105889 };
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return MurmurHash(s.data(), s.size(), seeds[index]) % max_num_buckets;
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}
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Status CuckooTableFactory::NewTableReader(const Options& options,
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const EnvOptions& soptions, const InternalKeyComparator& icomp,
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std::unique_ptr<RandomAccessFile>&& file, uint64_t file_size,
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std::unique_ptr<TableReader>* table) const {
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std::unique_ptr<CuckooTableReader> new_reader(new CuckooTableReader(options,
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std::move(file), file_size, GetSliceMurmurHash));
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Status s = new_reader->status();
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if (s.ok()) {
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*table = std::move(new_reader);
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}
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return s;
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}
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TableBuilder* CuckooTableFactory::NewTableBuilder(
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const Options& options, const InternalKeyComparator& internal_comparator,
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WritableFile* file, CompressionType compression_type) const {
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return new CuckooTableBuilder(file, hash_table_ratio_, kMaxNumHashTable,
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max_search_depth_, GetSliceMurmurHash);
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}
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TableFactory* NewCuckooTableFactory(double hash_table_ratio,
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uint32_t max_search_depth) {
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return new CuckooTableFactory(hash_table_ratio, max_search_depth);
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}
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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