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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).
+//
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#pragma once
+#ifndef ROCKSDB_LITE
+#include <string>
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "db/dbformat.h"
+#include "options/cf_options.h"
+#include "rocksdb/env.h"
+#include "rocksdb/options.h"
+#include "table/table_reader.h"
+#include "util/file_reader_writer.h"
+
+namespace rocksdb {
+
+class Arena;
+class TableReader;
+
+class CuckooTableReader: public TableReader {
+ public:
+ CuckooTableReader(const ImmutableCFOptions& ioptions,
+ std::unique_ptr<RandomAccessFileReader>&& file,
+ uint64_t file_size, const Comparator* user_comparator,
+ uint64_t (*get_slice_hash)(const Slice&, uint32_t,
+ uint64_t));
+ ~CuckooTableReader() {}
+
+ std::shared_ptr<const TableProperties> GetTableProperties() const override {
+ return table_props_;
+ }
+
+ Status status() const { return status_; }
+
+ Status Get(const ReadOptions& readOptions, const Slice& key,
+ GetContext* get_context, const SliceTransform* prefix_extractor,
+ bool skip_filters = false) override;
+
+ InternalIterator* NewIterator(const ReadOptions&,
+ const SliceTransform* prefix_extractor,
+ Arena* arena = nullptr,
+ bool skip_filters = false,
+ bool for_compaction = false) override;
+ void Prepare(const Slice& target) override;
+
+ // Report an approximation of how much memory has been used.
+ size_t ApproximateMemoryUsage() const override;
+
+ // Following methods are not implemented for Cuckoo Table Reader
+ uint64_t ApproximateOffsetOf(const Slice& /*key*/) override { return 0; }
+ void SetupForCompaction() override {}
+ // End of methods not implemented.
+
+ private:
+ friend class CuckooTableIterator;
+ void LoadAllKeys(std::vector<std::pair<Slice, uint32_t>>* key_to_bucket_id);
+ std::unique_ptr<RandomAccessFileReader> file_;
+ Slice file_data_;
+ bool is_last_level_;
+ bool identity_as_first_hash_;
+ bool use_module_hash_;
+ std::shared_ptr<const TableProperties> table_props_;
+ Status status_;
+ uint32_t num_hash_func_;
+ std::string unused_key_;
+ uint32_t key_length_;
+ uint32_t user_key_length_;
+ uint32_t value_length_;
+ uint32_t bucket_length_;
+ uint32_t cuckoo_block_size_;
+ uint32_t cuckoo_block_bytes_minus_one_;
+ uint64_t table_size_;
+ const Comparator* ucomp_;
+ uint64_t (*get_slice_hash_)(const Slice& s, uint32_t index,
+ uint64_t max_num_buckets);
+};
+
+} // namespace rocksdb
+#endif // ROCKSDB_LITE