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 #define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kStorage
32
33 #include "mongo/platform/basic.h"
34
35 #include "mongo/db/catalog/database_holder.h"
36
37 namespace mongo {
38
39 DatabaseHolder::Impl::~Impl() = default;
40
41 namespace {
42 stdx::function<DatabaseHolder::factory_function_type> factory;
43 } // namespace
44
registerFactory(decltype(factory)newFactory)45 void DatabaseHolder::registerFactory(decltype(factory) newFactory) {
46 factory = std::move(newFactory);
47 }
48
makeImpl()49 auto DatabaseHolder::makeImpl() -> std::unique_ptr<Impl> {
50 return factory();
51 }
52
hook()53 void DatabaseHolder::TUHook::hook() noexcept {}
54
55 namespace {
56 stdx::function<decltype(dbHolder)> dbHolderImpl;
57 } // namespace
58 } // namespace mongo
59
60 // The `mongo::` prefix is necessary to placate MSVC -- it is unable to properly identify anonymous
61 // nested namespace members in `decltype` expressions when defining functions using scope-resolution
62 // syntax.
registerDbHolderImpl(decltype(mongo::dbHolderImpl)impl)63 void mongo::registerDbHolderImpl(decltype(mongo::dbHolderImpl) impl) {
64 dbHolderImpl = std::move(impl);
65 }
66
dbHolder()67 auto mongo::dbHolder() -> DatabaseHolder& {
68 return dbHolderImpl();
69 }
70