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
130
131
|
/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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 <boost/optional.hpp>
#include "mongo/base/status.h"
#include "mongo/db/commands/end_sessions_gen.h"
#include "mongo/db/logical_session_id.h"
#include "mongo/db/refresh_sessions_gen.h"
namespace mongo {
class Client;
class OperationContext;
class ServiceContext;
/**
* The interface for the logical session cache
*/
class LogicalSessionCache {
public:
/**
* Decorate the ServiceContext with a LogicalSessionCache instance.
*/
static LogicalSessionCache* get(ServiceContext* service);
static LogicalSessionCache* get(OperationContext* opCtx);
static void set(ServiceContext* service, std::unique_ptr<LogicalSessionCache> sessionCache);
virtual ~LogicalSessionCache() = 0;
/**
* If the cache contains a record for this LogicalSessionId, promotes that lsid
* to be the most recently used and updates its lastUse date to be the current
* time. Returns an error if the session was not found.
*/
virtual Status promote(LogicalSessionId lsid) = 0;
/**
* Inserts a new authoritative session record into the cache. This method will
* insert the authoritative record into the sessions collection. This method
* should only be used when starting new sessions and should not be used to
* insert records for existing sessions.
*/
virtual void startSession(OperationContext* opCtx, LogicalSessionRecord record) = 0;
/**
* Refresh the given sessions. Updates the timestamps of these records in
* the local cache.
*/
virtual Status refreshSessions(OperationContext* opCtx,
const RefreshSessionsCmdFromClient& cmd) = 0;
virtual Status refreshSessions(OperationContext* opCtx,
const RefreshSessionsCmdFromClusterMember& cmd) = 0;
/**
* Vivifies the session in the cache. I.e. creates it if it isn't there, updates last use if it
* is.
*/
virtual void vivify(OperationContext* opCtx, const LogicalSessionId& lsid) = 0;
/**
* enqueues LogicalSessionIds for removal during the next _refresh()
*/
virtual void endSessions(const LogicalSessionIdSet& lsids) = 0;
/**
* Refreshes the cache synchronously. This flushes all pending refreshes and
* inserts to the sessions collection.
*/
virtual Status refreshNow(Client* client) = 0;
/**
* Reaps transaction records synchronously.
*/
virtual Status reapNow(Client* client) = 0;
/**
* Returns the current time.
*/
virtual Date_t now() = 0;
/**
* Returns the number of session records currently in the cache.
*/
virtual size_t size() = 0;
/**
* Ennumerate all LogicalSessionId keys currently in the cache.
*/
virtual std::vector<LogicalSessionId> listIds() const = 0;
/**
* Ennumerate all LogicalSessionId keys in the cache for the given UserDigests.
*/
virtual std::vector<LogicalSessionId> listIds(
const std::vector<SHA256Block>& userDigest) const = 0;
/**
* Retrieve a LogicalSessionRecord by LogicalSessionId, if it exists in the cache.
*/
virtual boost::optional<LogicalSessionRecord> peekCached(const LogicalSessionId& id) const = 0;
};
} // namespace mongo
|