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
|
/**
* 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 <string>
#include "mongo/db/clientcursor.h"
#include "mongo/db/dbmessage.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/rpc/message.h"
namespace mongo {
class NamespaceString;
class OperationContext;
/**
* Returns true if we should keep a cursor around because we're expecting to return more query
* results.
*
* If false, the caller should close the cursor and indicate this to the client by sending back
* a cursor ID of 0.
*/
bool shouldSaveCursor(OperationContext* opCtx,
const CollectionPtr& collection,
PlanExecutor::ExecState finalState,
PlanExecutor* exec);
/**
* Similar to shouldSaveCursor(), but used in getMore to determine whether we should keep the cursor
* around for additional getMores().
*
* If false, the caller should close the cursor and indicate this to the client by sending back a
* cursor ID of 0.
*/
bool shouldSaveCursorGetMore(PlanExecutor* exec, bool isTailable);
/**
* 1) Fills out CurOp for "opCtx" with information regarding this query's execution.
* 2) Reports index usage to the CollectionQueryInfo.
*
* Uses explain functionality to extract stats from 'exec'.
*/
void endQueryOp(OperationContext* opCtx,
const CollectionPtr& collection,
const PlanExecutor& exec,
long long numResults,
CursorId cursorId);
} // namespace mongo
|
