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/**
* 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 <map>
#include <memory>
#include <vector>
#include "mongo/bson/timestamp.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context.h"
namespace mongo {
class UncommittedCollections {
public:
/**
* Wrapper class for the resources used by UncommittedCollections
*/
class UncommittedCollectionsMap {
friend class UncommittedCollections;
private:
bool empty() {
return _collections.empty() && _nssIndex.empty();
}
void erase(UUID uuid, NamespaceString nss) {
_collections.erase(uuid);
_nssIndex.erase(nss);
}
std::map<UUID, std::unique_ptr<Collection>> _collections;
std::map<NamespaceString, UUID> _nssIndex;
};
UncommittedCollections() {
_resourcesPtr = std::make_shared<UncommittedCollectionsMap>();
}
~UncommittedCollections() = default;
std::weak_ptr<UncommittedCollectionsMap> getResources() {
return std::weak_ptr<UncommittedCollectionsMap>(_resourcesPtr);
}
std::shared_ptr<UncommittedCollectionsMap> shareResources() {
return _resourcesPtr;
}
void receiveResources(std::shared_ptr<UncommittedCollectionsMap> resources) {
invariant(_resourcesPtr->empty());
_resourcesPtr = resources;
}
static UncommittedCollections& get(OperationContext* opCtx);
static void addToTxn(OperationContext* opCtx,
std::unique_ptr<Collection> coll,
Timestamp createTime);
static Collection* getForTxn(OperationContext* opCtx, const NamespaceStringOrUUID& nss);
static Collection* getForTxn(OperationContext* opCtx, const NamespaceString& nss);
static Collection* getForTxn(OperationContext* opCtx, const UUID& uuid);
/**
* Registers any uncommitted collections with the CollectionCatalog. If registering a collection
* name conflicts with an existing entry, this method will throw a `WriteConflictException`.
*/
static void commit(OperationContext* opCtx,
UUID uuid,
Timestamp createTs,
UncommittedCollectionsMap* map);
/**
* Erases the UUID/NamespaceString entries corresponding to `uuid` and `nss` from `map`.
*/
static void erase(UUID uuid, NamespaceString nss, UncommittedCollectionsMap* map);
bool isUncommittedCollection(OperationContext* opCtx, const NamespaceString& nss) const;
void invariantHasExclusiveAccessToCollection(OperationContext* opCtx,
const NamespaceString& nss) const;
bool isEmpty();
static void clear(UncommittedCollectionsMap* map) {
map->_collections.clear();
map->_nssIndex.clear();
}
private:
std::shared_ptr<UncommittedCollectionsMap> _resourcesPtr;
};
} // namespace mongo
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