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
|
/**
* 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 <functional>
#include <string>
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
#include "mongo/db/namespace_string.h"
namespace mongo {
class BSONObj;
class Database;
class OperationContext;
class RecordData;
/**
* ViewCatalogLookupBehavior specifies whether a lookup into the view catalog should attempt to
* validate the durable entries that currently exist within the catalog. This validation should
* rarely be skipped.
*/
enum class ViewCatalogLookupBehavior { kValidateDurableViews, kAllowInvalidDurableViews };
/**
* Interface for system.views collection operations associated with view catalog management.
* All methods must be called from within a WriteUnitOfWork, and with the DBLock held in at
* least intent mode.
*/
class DurableViewCatalog {
public:
static constexpr StringData viewsCollectionName() {
return NamespaceString::kSystemDotViewsCollectionName;
}
/**
* Thread-safe method to mark a catalog name was changed. This will cause the in-memory
* view catalog to be reloaded immediately.
*/
static void onExternalChange(OperationContext* opCtx, const NamespaceString& name);
/**
* Thread-safe method to clear the in-memory state of the view catalog when the 'system.views'
* collection is dropped.
*/
static void onSystemViewsCollectionDrop(OperationContext* opCtx, const NamespaceString& name);
using Callback = std::function<Status(const BSONObj& view)>;
virtual void iterate(OperationContext* opCtx, Callback callback) = 0;
virtual void iterateIgnoreInvalidEntries(OperationContext* opCtx, Callback callback) = 0;
virtual void upsert(OperationContext* opCtx,
const NamespaceString& name,
const BSONObj& view) = 0;
virtual void remove(OperationContext* opCtx, const NamespaceString& name) = 0;
virtual const std::string& getName() const = 0;
virtual ~DurableViewCatalog() = default;
};
/**
* Actual implementation of DurableViewCatalog for use by the Database class.
* Implements durability through database operations on the system.views collection.
*/
class DurableViewCatalogImpl final : public DurableViewCatalog {
public:
explicit DurableViewCatalogImpl(Database* db) : _db(db) {}
void iterate(OperationContext* opCtx, Callback callback);
void iterateIgnoreInvalidEntries(OperationContext* opCtx, Callback callback);
void upsert(OperationContext* opCtx, const NamespaceString& name, const BSONObj& view);
void remove(OperationContext* opCtx, const NamespaceString& name);
const std::string& getName() const;
private:
void _iterate(OperationContext* opCtx,
Callback callback,
ViewCatalogLookupBehavior lookupBehavior);
BSONObj _validateViewDefinition(OperationContext* opCtx, const RecordData& recordData);
Database* const _db;
};
} // namespace mongo
|
