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
|
/**
* Copyright (C) 2021-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 <cstdint>
#include <third_party/murmurhash3/MurmurHash3.h>
#include "mongo/config.h"
#include "mongo/db/service_context.h"
#include "mongo/db/sorter/options.h"
#include "mongo/db/storage/encryption_hooks.h"
namespace mongo::sorter {
/**
* Generates a new file name on each call using a static, atomic and monotonically increasing
* number. Each name is suffixed with a random number generated at startup, to prevent name
* collisions when the external sort files are preserved across restarts.
*/
std::string nextFileName(StringData name);
/**
* Calculates and returns a new murmur hash value based on the prior murmur hash and a new piece
* of data.
*/
uint32_t addDataToChecksum(const void* data, std::size_t size, uint32_t checksum);
/**
* Returns the current EncryptionHooks registered with the global service context.
* Returns nullptr if the service context is not available; or if the EncyptionHooks
* registered is not enabled.
*/
EncryptionHooks* getEncryptionHooksIfEnabled();
template <typename Data>
void dassertCompIsSane(const std::function<int(const Data& lhs, const Data& rhs)>& comp,
const Data& lhs,
const Data& rhs) {
#if defined(MONGO_CONFIG_DEBUG_BUILD) && !defined(_MSC_VER)
// MSVC++ already does similar verification in debug mode in addition to using algorithms that
// do more comparisons. Doing our own verification in addition makes debug builds considerably
// slower without any additional safety.
// Test reversed comparisons.
const int regular = comp(lhs, rhs);
if (regular == 0) {
invariant(comp(rhs, lhs) == 0);
} else if (regular < 0) {
invariant(comp(rhs, lhs) > 0);
} else {
invariant(comp(rhs, lhs) < 0);
}
// Test reflexivity.
invariant(comp(lhs, lhs) == 0);
invariant(comp(rhs, rhs) == 0);
#endif
}
} // namespace mongo::sorter
|
