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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
// Copyright (c) Meta Platforms, Inc. and affiliates.
// 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 "db/multi_cf_iterator_impl.h"
#include "rocksdb/attribute_groups.h"
namespace ROCKSDB_NAMESPACE {
class AttributeGroupIteratorImpl : public AttributeGroupIterator {
public:
AttributeGroupIteratorImpl(
const ReadOptions& read_options, const Comparator* comparator,
std::vector<std::pair<ColumnFamilyHandle*, std::unique_ptr<Iterator>>>&&
cfh_iter_pairs)
: impl_(read_options, comparator, std::move(cfh_iter_pairs),
ResetFunc(this), PopulateFunc(this)) {}
~AttributeGroupIteratorImpl() override {}
// No copy allowed
AttributeGroupIteratorImpl(const AttributeGroupIteratorImpl&) = delete;
AttributeGroupIteratorImpl& operator=(const AttributeGroupIteratorImpl&) =
delete;
bool Valid() const override { return impl_.Valid(); }
void SeekToFirst() override { impl_.SeekToFirst(); }
void SeekToLast() override { impl_.SeekToLast(); }
void Seek(const Slice& target) override { impl_.Seek(target); }
void SeekForPrev(const Slice& target) override { impl_.SeekForPrev(target); }
void Next() override { impl_.Next(); }
void Prev() override { impl_.Prev(); }
Slice key() const override { return impl_.key(); }
Status status() const override { return impl_.status(); }
const IteratorAttributeGroups& attribute_groups() const override {
assert(Valid());
return attribute_groups_;
}
void Reset() { attribute_groups_.clear(); }
bool PrepareValue() override { return impl_.PrepareValue(); }
private:
class ResetFunc {
public:
explicit ResetFunc(AttributeGroupIteratorImpl* iter) : iter_(iter) {}
void operator()() const {
assert(iter_);
iter_->Reset();
}
private:
AttributeGroupIteratorImpl* iter_;
};
class PopulateFunc {
public:
explicit PopulateFunc(AttributeGroupIteratorImpl* iter) : iter_(iter) {}
void operator()(const autovector<MultiCfIteratorInfo>& items) const {
assert(iter_);
iter_->AddToAttributeGroups(items);
}
private:
AttributeGroupIteratorImpl* iter_;
};
MultiCfIteratorImpl<ResetFunc, PopulateFunc> impl_;
IteratorAttributeGroups attribute_groups_;
void AddToAttributeGroups(const autovector<MultiCfIteratorInfo>& items);
};
class EmptyAttributeGroupIterator : public AttributeGroupIterator {
public:
explicit EmptyAttributeGroupIterator(const Status& s) : status_(s) {}
bool Valid() const override { return false; }
void Seek(const Slice& /*target*/) override {}
void SeekForPrev(const Slice& /*target*/) override {}
void SeekToFirst() override {}
void SeekToLast() override {}
void Next() override { assert(false); }
void Prev() override { assert(false); }
Slice key() const override {
assert(false);
return Slice();
}
Status status() const override { return status_; }
const IteratorAttributeGroups& attribute_groups() const override {
return kNoIteratorAttributeGroups;
}
private:
Status status_;
};
inline std::unique_ptr<AttributeGroupIterator> NewAttributeGroupErrorIterator(
const Status& status) {
return std::make_unique<EmptyAttributeGroupIterator>(status);
}
} // namespace ROCKSDB_NAMESPACE
|
