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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
/**
* 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.
*/
#pragma once
#include <map>
#include <memory>
#include <vector>
#include "mongo/bson/timestamp.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context.h"
namespace mongo {
class UncommittedCollections {
public:
/**
* Wrapper class for the resources used by UncommittedCollections
*/
class UncommittedCollectionsMap {
friend class UncommittedCollections;
private:
bool empty() {
return _collections.empty() && _nssIndex.empty();
}
void erase(UUID uuid, NamespaceString nss) {
_collections.erase(uuid);
_nssIndex.erase(nss);
}
std::map<UUID, std::unique_ptr<Collection>> _collections;
std::map<NamespaceString, UUID> _nssIndex;
std::vector<UUID> _registeredUUIDs;
};
UncommittedCollections() {
_resourcesPtr = std::make_shared<UncommittedCollectionsMap>();
}
~UncommittedCollections() = default;
std::weak_ptr<UncommittedCollectionsMap> getResources() {
return std::weak_ptr<UncommittedCollectionsMap>(_resourcesPtr);
}
std::shared_ptr<UncommittedCollectionsMap> shareResources() {
return _resourcesPtr;
}
void receiveResources(std::shared_ptr<UncommittedCollectionsMap> resources) {
invariant(_resourcesPtr->empty());
_resourcesPtr = resources;
}
static UncommittedCollections& get(OperationContext* opCtx);
static void addToTxn(OperationContext* opCtx,
std::unique_ptr<Collection> coll,
Timestamp createTime);
static Collection* getForTxn(OperationContext* opCtx, const NamespaceStringOrUUID& nss);
static Collection* getForTxn(OperationContext* opCtx, const NamespaceString& nss);
static Collection* getForTxn(OperationContext* opCtx, const UUID& uuid);
/**
* Registers any uncommitted collections with the CollectionCatalog. If registering a collection
* name conflicts with an existing entry, this method will throw a `WriteConflictException`.
*/
static void commit(OperationContext* opCtx,
UUID uuid,
Timestamp createTs,
UncommittedCollectionsMap* map);
/**
* If the collection with uuid `uuid` was previously registered with the CollectionCatalog as
* part of the current multi-document transaction, this handler deregisters it.
*/
static void rollback(ServiceContext* svcCtx,
CollectionUUID uuid,
UncommittedCollectionsMap* map);
/**
* Erases the UUID/NamespaceString entries corresponding to `uuid` and `nss` from `map`.
*/
static void erase(UUID uuid, NamespaceString nss, UncommittedCollectionsMap* map);
bool isUncommittedCollection(OperationContext* opCtx, const NamespaceString& nss) const;
void invariantHasExclusiveAccessToCollection(OperationContext* opCtx,
const NamespaceString& nss) const;
bool isEmpty();
static void clear(UncommittedCollectionsMap* map) {
map->_collections.clear();
map->_nssIndex.clear();
map->_registeredUUIDs.clear();
}
private:
std::shared_ptr<UncommittedCollectionsMap> _resourcesPtr;
};
} // namespace mongo
|
