/** * 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 * . * * 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. */ #define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kStorage #include "mongo/platform/basic.h" #include #include "mongo/db/catalog/namespace_uuid_cache.h" #include "mongo/db/catalog/database.h" #include "mongo/db/catalog/namespace_uuid_cache_gen.h" #include "mongo/util/assert_util.h" #include "mongo/util/log.h" namespace mongo { const OperationContext::Decoration NamespaceUUIDCache::get = OperationContext::declareDecoration(); void NamespaceUUIDCache::ensureNamespaceInCache(const NamespaceString& nss, CollectionUUID uuid) { StringData ns(nss.ns()); CollectionUUIDMap::const_iterator it = _cache.find(ns); if (it == _cache.end()) { // Add ns, uuid pair to the cache if it does not yet exist. invariant(_cache.try_emplace(ns, uuid).second == true); LOG(3) << "NamespaceUUIDCache: registered namespace " << nss << " with UUID " << uuid; } else if (it->second != uuid) { // If ns exists in the cache, make sure it does not correspond to another uuid. auto msg = "Namespace " + ns + " now resolves to UUID " + uuid.toString() + " instead of UUID " + it->second.toString(); LOG(1) << msg; uassert(40418, "Cannot continue operation: " + msg, !debugCollectionUUIDs); } } void NamespaceUUIDCache::evictNamespace(const NamespaceString& nss) { size_t evicted = _cache.erase(nss.ns()); if (evicted) { LOG(2) << "NamespaceUUIDCache: evicted namespace " << nss; } invariant(evicted <= 1); } void NamespaceUUIDCache::evictNamespacesInDatabase(StringData dbname) { for (auto&& it = _cache.begin(); it != _cache.end();) { auto entry = it++; if (entry->first.empty() || nsToDatabaseSubstring(entry->first) == dbname) _cache.erase(entry); } } } // namespace mongo