blob: 691d3c54ef0a14d598c9be61db792a7aeddbefa9 (
plain)
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
|
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/pipeline/sequential_document_cache.h"
#include "mongo/base/error_codes.h"
#include "mongo/base/status.h"
namespace mongo {
void SequentialDocumentCache::add(Document doc) {
invariant(_status == CacheStatus::kBuilding);
if (checkCacheSize(doc) != CacheStatus::kAbandoned) {
_sizeBytes += doc.getApproximateSize();
_cache.push_back(std::move(doc));
}
}
void SequentialDocumentCache::freeze() {
invariant(_status == CacheStatus::kBuilding);
_status = CacheStatus::kServing;
_cache.shrink_to_fit();
_cacheIter = _cache.begin();
}
void SequentialDocumentCache::abandon() {
_status = CacheStatus::kAbandoned;
_cache.clear();
_cache.shrink_to_fit();
_cacheIter = _cache.begin();
}
boost::optional<Document> SequentialDocumentCache::getNext() {
invariant(_status == CacheStatus::kServing);
if (_cacheIter == _cache.end()) {
return boost::none;
}
return *_cacheIter++;
}
void SequentialDocumentCache::restartIteration() {
invariant(_status == CacheStatus::kServing);
_cacheIter = _cache.begin();
}
SequentialDocumentCache::CacheStatus SequentialDocumentCache::checkCacheSize(const Document& doc) {
if (_sizeBytes + doc.getApproximateSize() > _maxSizeBytes) {
abandon();
}
return _status;
}
} // namespace mongo
|
