1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
// 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).
//
#pragma once
#include <cassert>
#include "block_type.h"
#include "table/block_based/cachable_entry.h"
#include "table/block_based/filter_block.h"
namespace ROCKSDB_NAMESPACE {
class BlockBasedTable;
class FilePrefetchBuffer;
// Encapsulates common functionality for the various filter block reader
// implementations. Provides access to the filter block regardless of whether
// it is owned by the reader or stored in the cache, or whether it is pinned
// in the cache or not.
template <typename TBlocklike>
class FilterBlockReaderCommon : public FilterBlockReader {
public:
FilterBlockReaderCommon(const BlockBasedTable* t,
CachableEntry<TBlocklike>&& filter_block)
: table_(t), filter_block_(std::move(filter_block)) {
assert(table_);
const SliceTransform* const prefix_extractor = table_prefix_extractor();
if (prefix_extractor) {
full_length_enabled_ =
prefix_extractor->FullLengthEnabled(&prefix_extractor_full_length_);
}
}
bool RangeMayExist(const Slice* iterate_upper_bound, const Slice& user_key,
const SliceTransform* prefix_extractor,
const Comparator* comparator,
const Slice* const const_ikey_ptr, bool* filter_checked,
bool need_upper_bound_check, bool no_io,
BlockCacheLookupContext* lookup_context,
Env::IOPriority rate_limiter_priority) override;
protected:
static Status ReadFilterBlock(const BlockBasedTable* table,
FilePrefetchBuffer* prefetch_buffer,
const ReadOptions& read_options, bool use_cache,
GetContext* get_context,
BlockCacheLookupContext* lookup_context,
CachableEntry<TBlocklike>* filter_block,
BlockType block_type);
const BlockBasedTable* table() const { return table_; }
const SliceTransform* table_prefix_extractor() const;
bool whole_key_filtering() const;
bool cache_filter_blocks() const;
Status GetOrReadFilterBlock(bool no_io, GetContext* get_context,
BlockCacheLookupContext* lookup_context,
CachableEntry<TBlocklike>* filter_block,
BlockType block_type,
Env::IOPriority rate_limiter_priority) const;
size_t ApproximateFilterBlockMemoryUsage() const;
private:
bool IsFilterCompatible(const Slice* iterate_upper_bound, const Slice& prefix,
const Comparator* comparator) const;
private:
const BlockBasedTable* table_;
CachableEntry<TBlocklike> filter_block_;
size_t prefix_extractor_full_length_ = 0;
bool full_length_enabled_ = false;
};
} // namespace ROCKSDB_NAMESPACE
|
