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// database.h
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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 "mongo/base/string_data.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/db/catalog/collection_options.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/storage/storage_options.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/string_map.h"
namespace mongo {
class Collection;
class DataFile;
class DatabaseCatalogEntry;
class ExtentManager;
class IndexCatalog;
class NamespaceDetails;
class OperationContext;
/**
* Represents a logical database containing Collections.
*
* The semantics for a const Database are that you can mutate individual collections but not add or
* remove them.
*/
class Database {
public:
typedef StringMap<Collection*> CollectionMap;
/**
* Iterating over a Database yields Collection* pointers.
*/
class iterator {
public:
using iterator_category = std::forward_iterator_tag;
using value_type = Collection*;
using pointer = const value_type*;
using reference = const value_type&;
using difference_type = ptrdiff_t;
iterator() = default;
iterator(CollectionMap::const_iterator it) : _it(it) {}
reference operator*() const {
return _it->second;
}
pointer operator->() const {
return &_it->second;
}
bool operator==(const iterator& other) {
return _it == other._it;
}
bool operator!=(const iterator& other) {
return _it != other._it;
}
iterator& operator++() {
++_it;
return *this;
}
iterator operator++(int) {
auto oldPosition = *this;
++_it;
return oldPosition;
}
private:
CollectionMap::const_iterator _it;
};
Database(OperationContext* txn, StringData name, DatabaseCatalogEntry* dbEntry);
// must call close first
~Database();
iterator begin() const {
return iterator(_collections.begin());
}
iterator end() const {
return iterator(_collections.end());
}
// closes files and other cleanup see below.
void close(OperationContext* txn);
const std::string& name() const {
return _name;
}
void clearTmpCollections(OperationContext* txn);
/**
* Sets a new profiling level for the database and returns the outcome.
*
* @param txn Operation context which to use for creating the profiling collection.
* @param newLevel New profiling level to use.
*/
Status setProfilingLevel(OperationContext* txn, int newLevel);
int getProfilingLevel() const {
return _profile;
}
const char* getProfilingNS() const {
return _profileName.c_str();
}
void getStats(OperationContext* opCtx, BSONObjBuilder* output, double scale = 1);
const DatabaseCatalogEntry* getDatabaseCatalogEntry() const;
Status dropCollection(OperationContext* txn, StringData fullns);
Collection* createCollection(OperationContext* txn,
StringData ns,
const CollectionOptions& options = CollectionOptions(),
bool createDefaultIndexes = true);
/**
* @param ns - this is fully qualified, which is maybe not ideal ???
*/
Collection* getCollection(StringData ns) const;
Collection* getCollection(const NamespaceString& ns) const {
return getCollection(ns.ns());
}
Collection* getOrCreateCollection(OperationContext* txn, StringData ns);
Status renameCollection(OperationContext* txn,
StringData fromNS,
StringData toNS,
bool stayTemp);
/**
* @return name of an existing database with same text name but different
* casing, if one exists. Otherwise the empty std::string is returned. If
* 'duplicates' is specified, it is filled with all duplicate names.
// TODO move???
*/
static std::string duplicateUncasedName(const std::string& name,
std::set<std::string>* duplicates = 0);
static Status validateDBName(StringData dbname);
const std::string& getSystemIndexesName() const {
return _indexesName;
}
private:
/**
* Gets or creates collection instance from existing metadata,
* Returns NULL if invalid
*
* Note: This does not add the collection to _collections map, that must be done
* by the caller, who takes onership of the Collection*
*/
Collection* _getOrCreateCollectionInstance(OperationContext* txn, StringData fullns);
/**
* Deregisters and invalidates all cursors on collection 'fullns'. Callers must specify
* 'reason' for why the cache is being cleared.
*/
void _clearCollectionCache(OperationContext* txn, StringData fullns, const std::string& reason);
class AddCollectionChange;
class RemoveCollectionChange;
const std::string _name; // "alleyinsider"
DatabaseCatalogEntry* _dbEntry; // not owned here
const std::string _profileName; // "alleyinsider.system.profile"
const std::string _indexesName; // "alleyinsider.system.indexes"
int _profile; // 0=off.
CollectionMap _collections;
friend class Collection;
friend class NamespaceDetails;
friend class IndexCatalog;
};
void dropDatabase(OperationContext* txn, Database* db);
void dropAllDatabasesExceptLocal(OperationContext* txn);
Status userCreateNS(OperationContext* txn,
Database* db,
StringData ns,
BSONObj options,
bool createDefaultIndexes = true);
} // namespace mongo
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