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