blob: e805e9c577ad55c03a2e6844fa91172dfd347e0c (
plain) (
blame)
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
|
// Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "entryref.h"
#include <vector>
#include <vespa/vespalib/stllike/allocator.h>
namespace vespalib::datastore {
/**
* Remapper for related UniqueStore class, used for adjusting
* references to unique store after compaction.
*/
template <typename RefT>
class UniqueStoreRemapper {
public:
using RefType = RefT;
protected:
std::vector<bool> _compacting_buffer;
std::vector<std::vector<EntryRef, allocator_large<EntryRef>>> _mapping;
public:
UniqueStoreRemapper()
: _compacting_buffer(),
_mapping()
{
}
virtual ~UniqueStoreRemapper() = default;
EntryRef remap(EntryRef ref) const {
if (ref.valid()) {
RefType internal_ref(ref);
if (!_compacting_buffer[internal_ref.bufferId()]) {
// No remapping for references to buffers not being compacted
return ref;
} else {
auto &inner_mapping = _mapping[internal_ref.bufferId()];
assert(internal_ref.unscaled_offset() < inner_mapping.size());
EntryRef mapped_ref = inner_mapping[internal_ref.unscaled_offset()];
assert(mapped_ref.valid());
return mapped_ref;
}
} else {
return EntryRef();
}
}
void remap(vespalib::ArrayRef<EntryRef> refs) const {
for (auto &ref : refs) {
auto mapped_ref = remap(ref);
if (mapped_ref != ref) {
ref = mapped_ref;
}
}
}
virtual void done() = 0;
};
}
|
