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
|
/**
* Copyright (C) 2022-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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/query/ce/stats_cache.h"
#include "mongo/db/query/ce/stats_catalog.h"
#include "mongo/db/query/ce/array_histogram.h"
#include "mongo/db/query/ce/collection_statistics.h"
#include "mongo/util/read_through_cache.h"
#include "mongo/logv2/log.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kQuery
namespace mongo {
using namespace mongo::ce;
namespace {
const auto statsCatalogDecoration =
ServiceContext::declareDecoration<std::unique_ptr<StatsCatalog>>();
} // namespace
StatsCatalog::StatsCatalog(ServiceContext* service,
std::unique_ptr<StatsCacheLoader> statsCacheLoader)
: _executor(std::make_shared<ThreadPool>([] {
ThreadPool::Options options;
options.poolName = "StatsCache";
options.minThreads = 0;
options.maxThreads = 1;
return options;
}())),
_statsCache(service, std::move(statsCacheLoader), *_executor, 1000) {
_executor->startup();
}
StatsCatalog::~StatsCatalog() {
// The executor is used by the StatsCatalog, so it must be joined, before this cache is
// destroyed, per the contract of ReadThroughCache.
_executor->shutdown();
_executor->join();
}
void StatsCatalog::set(ServiceContext* serviceContext, std::unique_ptr<StatsCatalog> cache) {
auto& statsCatalog = statsCatalogDecoration(serviceContext);
invariant(!statsCatalog);
statsCatalog = std::move(cache);
}
StatsCatalog& StatsCatalog::get(ServiceContext* serviceContext) {
auto& statsCatalog = statsCatalogDecoration(serviceContext);
invariant(statsCatalog);
return *statsCatalog;
}
StatsCatalog& StatsCatalog::get(OperationContext* opCtx) {
return get(opCtx->getServiceContext());
}
StatusWith<std::shared_ptr<ArrayHistogram>> StatsCatalog::getHistogram(OperationContext* opCtx,
const NamespaceString& nss,
const std::string& path) {
try {
auto handle = _statsCache.acquire(opCtx, std::make_pair(nss, path));
uassert(ErrorCodes::NamespaceNotFound,
str::stream() << "path " << nss << " : " << path << " not found",
handle);
return *(handle.get());
} catch (const DBException& ex) {
return ex.toStatus();
}
}
} // namespace mongo
|
