mirror of
https://github.com/facebook/rocksdb.git
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97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
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// Copyright (c) 2013, 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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#pragma once
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#ifndef ROCKSDB_LITE
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#include <stdint.h>
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#include <string>
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#include <vector>
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#include "rocksdb/status.h"
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#include "table/table_builder.h"
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#include "rocksdb/table.h"
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#include "rocksdb/table_properties.h"
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#include "util/autovector.h"
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namespace rocksdb {
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struct CuckooBucket {
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CuckooBucket(): is_empty(true) {}
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Slice key;
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Slice value;
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bool is_empty;
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};
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class CuckooTableBuilder: public TableBuilder {
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public:
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CuckooTableBuilder(
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WritableFile* file, unsigned int fixed_key_length,
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unsigned int fixed_value_length, double hash_table_ratio,
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unsigned int file_size, unsigned int max_num_hash_table,
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unsigned int max_search_depth,
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unsigned int (*GetSliceHash)(const Slice&, unsigned int,
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unsigned int));
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// REQUIRES: Either Finish() or Abandon() has been called.
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~CuckooTableBuilder();
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// Add key,value to the table being constructed.
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// REQUIRES: key is after any previously added key according to comparator.
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// REQUIRES: Finish(), Abandon() have not been called
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void Add(const Slice& key, const Slice& value) override;
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// Return non-ok iff some error has been detected.
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Status status() const override;
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// Finish building the table. Stops using the file passed to the
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// constructor after this function returns.
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// REQUIRES: Finish(), Abandon() have not been called
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Status Finish() override;
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// Indicate that the contents of this builder should be abandoned. Stops
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// using the file passed to the constructor after this function returns.
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// If the caller is not going to call Finish(), it must call Abandon()
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// before destroying this builder.
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// REQUIRES: Finish(), Abandon() have not been called
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void Abandon() override;
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// Number of calls to Add() so far.
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uint64_t NumEntries() const override;
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// Size of the file generated so far. If invoked after a successful
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// Finish() call, returns the size of the final generated file.
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uint64_t FileSize() const override;
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private:
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bool MakeSpaceForKey(const Slice& key, unsigned int* bucket_id,
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autovector<unsigned int> hash_vals);
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unsigned int num_hash_table_;
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WritableFile* file_;
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const unsigned int value_length_;
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const unsigned int bucket_size_;
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const double hash_table_ratio_;
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const unsigned int max_num_buckets_;
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const unsigned int max_num_hash_table_;
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const unsigned int max_search_depth_;
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Status status_;
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std::vector<CuckooBucket> buckets_;
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bool is_last_level_file_ = true;
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TableProperties properties_;
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unsigned int (*GetSliceHash)(const Slice& s, unsigned int index,
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unsigned int max_num_buckets);
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std::string unused_user_key_ = "";
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std::string prev_key_;
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bool closed_ = false; // Either Finish() or Abandon() has been called.
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// No copying allowed
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CuckooTableBuilder(const CuckooTableBuilder&) = delete;
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void operator=(const CuckooTableBuilder&) = delete;
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};
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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