1 
2 /**
3  *    Copyright (C) 2018-present MongoDB, Inc.
4  *
5  *    This program is free software: you can redistribute it and/or modify
6  *    it under the terms of the Server Side Public License, version 1,
7  *    as published by MongoDB, Inc.
8  *
9  *    This program is distributed in the hope that it will be useful,
10  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
11  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  *    Server Side Public License for more details.
13  *
14  *    You should have received a copy of the Server Side Public License
15  *    along with this program. If not, see
16  *    <http://www.mongodb.com/licensing/server-side-public-license>.
17  *
18  *    As a special exception, the copyright holders give permission to link the
19  *    code of portions of this program with the OpenSSL library under certain
20  *    conditions as described in each individual source file and distribute
21  *    linked combinations including the program with the OpenSSL library. You
22  *    must comply with the Server Side Public License in all respects for
23  *    all of the code used other than as permitted herein. If you modify file(s)
24  *    with this exception, you may extend this exception to your version of the
25  *    file(s), but you are not obligated to do so. If you do not wish to do so,
26  *    delete this exception statement from your version. If you delete this
27  *    exception statement from all source files in the program, then also delete
28  *    it in the license file.
29  */
30 
31 #pragma once
32 
33 #include "mongo/stdx/unordered_map.h"
34 #include "mongo/util/net/hostandport.h"
35 
36 namespace mongo {
37 namespace executor {
38 
39 /**
40  * Holds connection information for a specific pool or remote host. These objects are maintained by
41  * a parent ConnectionPoolStats object and should not need to be created directly.
42  */
43 struct ConnectionStatsPer {
44     ConnectionStatsPer(size_t nInUse, size_t nAvailable, size_t nCreated, size_t nRefreshing);
45 
46     ConnectionStatsPer();
47 
48     ConnectionStatsPer& operator+=(const ConnectionStatsPer& other);
49 
50     size_t inUse = 0u;
51     size_t available = 0u;
52     size_t created = 0u;
53     size_t refreshing = 0u;
54 };
55 
56 /**
57  * Aggregates connection information for the connPoolStats command. Connection pools should
58  * use the updateStatsForHost() method to append their host-specific information to this object.
59  * Total connection counts will then be updated accordingly.
60  */
61 struct ConnectionPoolStats {
62     void updateStatsForHost(std::string pool, HostAndPort host, ConnectionStatsPer newStats);
63 
64     void appendToBSON(mongo::BSONObjBuilder& result, bool forFTDC = false);
65 
66     size_t totalInUse = 0u;
67     size_t totalAvailable = 0u;
68     size_t totalCreated = 0u;
69     size_t totalRefreshing = 0u;
70 
71     stdx::unordered_map<std::string, ConnectionStatsPer> statsByPool;
72     stdx::unordered_map<HostAndPort, ConnectionStatsPer> statsByHost;
73     stdx::unordered_map<std::string, stdx::unordered_map<HostAndPort, ConnectionStatsPer>>
74         statsByPoolHost;
75 };
76 
77 }  // namespace executor
78 }  // namespace mongo
79