mirror of
https://github.com/facebook/rocksdb.git
synced 2024-12-02 10:15:54 +00:00
75b59d5146
Summary: Based on previous patches, this diff eventually provides the end-to-end mechanism for users to specify the hash-index. Test Plan: Wrote several new unit tests. Reviewers: sdong, haobo, dhruba Reviewed By: sdong CC: leveldb Differential Revision: https://reviews.facebook.net/D16539
62 lines
1.9 KiB
C++
62 lines
1.9 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.
|
|
//
|
|
// 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
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include "rocksdb/iterator.h"
|
|
#include "rocksdb/options.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
struct BlockContents;
|
|
class Comparator;
|
|
class BlockHashIndex;
|
|
|
|
class Block {
|
|
public:
|
|
// Initialize the block with the specified contents.
|
|
explicit Block(const BlockContents& contents);
|
|
|
|
~Block();
|
|
|
|
size_t size() const { return size_; }
|
|
const char* data() const { return data_; }
|
|
bool cachable() const { return cachable_; }
|
|
uint32_t NumRestarts() const;
|
|
CompressionType compression_type() const { return compression_type_; }
|
|
|
|
// If hash index lookup is enabled and `use_hash_index` is true. This block
|
|
// will do hash lookup for the key prefix.
|
|
//
|
|
// NOTE: for the hash based lookup, if a key prefix doesn't match any key,
|
|
// the iterator will simply be set as "invalid", rather than returning
|
|
// the key that is just pass the target key.
|
|
Iterator* NewIterator(const Comparator* comparator);
|
|
void SetBlockHashIndex(BlockHashIndex* hash_index);
|
|
|
|
private:
|
|
const char* data_;
|
|
size_t size_;
|
|
uint32_t restart_offset_; // Offset in data_ of restart array
|
|
bool owned_; // Block owns data_[]
|
|
bool cachable_;
|
|
CompressionType compression_type_;
|
|
std::unique_ptr<BlockHashIndex> hash_index_;
|
|
|
|
// No copying allowed
|
|
Block(const Block&);
|
|
void operator=(const Block&);
|
|
|
|
class Iter;
|
|
};
|
|
|
|
} // namespace rocksdb
|