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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/bson/bsonobj.h"
#include "mongo/db/catalog/collection_options.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/storage_options.h"
#include "mongo/util/concurrency/mutex.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/string_map.h"
namespace mongo {
class Collection;
class DatabaseCatalogEntry;
class DataFile;
class ExtentManager;
class IndexCatalog;
class MMAP1DatabaseCatalogEntry;
class MmapV1ExtentManager;
class NamespaceDetails;
class NamespaceIndex;
class OperationContext;
/**
* Database represents a database database
* Each database database has its own set of files -- dbname.ns, dbname.0, dbname.1, ...
* NOT memory mapped
*/
class Database {
public:
// you probably need to be in dbHolderMutex when constructing this
Database(OperationContext* txn,
const char *nm,
/*out*/ bool& newDb,
const std::string& path = storageGlobalParams.dbpath);
/* you must use this to close - there is essential code in this method that is not in the ~Database destructor.
thus the destructor is private. this could be cleaned up one day...
*/
static void closeDatabase( const std::string& db, const std::string& path );
const std::string& name() const { return _name; }
const std::string& path() const { return _path; }
void clearTmpCollections(OperationContext* txn);
bool isEmpty() const;
/**
* total file size of Database in bytes
*/
long long fileSize() const;
int numFiles() const;
void getFileFormat( int* major, int* minor );
/**
* @return true if success. false if bad level or error creating profile ns
*/
bool setProfilingLevel( OperationContext* txn, int newLevel , std::string& errmsg );
void flushFiles( bool sync );
/**
* @return true if ns is part of the database
* ns=foo.bar, db=foo returns true
*/
bool ownsNS( const std::string& ns ) const {
if ( ! mongoutils::str::startsWith( ns , _name ) )
return false;
return ns[_name.size()] == '.';
}
int getProfilingLevel() const { return _profile; }
const char* getProfilingNS() const { return _profileName.c_str(); }
void getStats( BSONObjBuilder* output, double scale = 1 );
long long getIndexSizeForCollection( Collection* collections,
BSONObjBuilder* details = NULL,
int scale = 1 );
const DatabaseCatalogEntry* getDatabaseCatalogEntry() const;
// TODO: do not think this method should exist, so should try and encapsulate better
MmapV1ExtentManager* getExtentManager();
const MmapV1ExtentManager* getExtentManager() const;
Status dropCollection( OperationContext* txn, const StringData& fullns );
Collection* createCollection( OperationContext* txn,
const StringData& ns,
const CollectionOptions& options = CollectionOptions(),
bool allocateSpace = true,
bool createDefaultIndexes = true );
/**
* @param ns - this is fully qualified, which is maybe not ideal ???
* The methods without a transaction are deprecated.
* TODO remove deprecated method once we require reads to have Transaction objects.
*/
Collection* getCollection( const StringData& ns );
Collection* getCollection( const NamespaceString& ns ) { return getCollection( ns.ns() ); }
Collection* getCollection( OperationContext* txn, const StringData& ns );
Collection* getCollection( OperationContext* txn, const NamespaceString& ns ) {
return getCollection( txn, ns.ns() );
}
Collection* getOrCreateCollection( const StringData& ns );
Collection* getOrCreateCollection( OperationContext* txn, const StringData& ns );
Status renameCollection( OperationContext* txn,
const StringData& fromNS,
const 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 string duplicateUncasedName( bool inholderlockalready,
const std::string &name,
const std::string &path,
std::set< std::string > *duplicates = 0 );
static Status validateDBName( const StringData& dbname );
const std::string& getSystemIndexesName() const { return _indexesName; }
private:
void _clearCollectionCache( const StringData& fullns );
void _clearCollectionCache_inlock( const StringData& fullns );
~Database(); // closes files and other cleanup see below.
void _addNamespaceToCatalog( OperationContext* txn,
const StringData& ns,
const BSONObj* options );
/**
* removes from *.system.namespaces
* frees extents
* removes from NamespaceIndex
* NOT RIGHT NOW, removes cache entry in Database TODO?
*/
Status _dropNS( OperationContext* txn, const StringData& ns );
Status _renameSingleNamespace( OperationContext* txn,
const StringData& fromNS,
const StringData& toNS,
bool stayTemp );
const std::string _name; // "alleyinsider"
const std::string _path; // "/data/db"
boost::scoped_ptr<MMAP1DatabaseCatalogEntry> _dbEntry;
const std::string _profileName; // "alleyinsider.system.profile"
const std::string _namespacesName; // "alleyinsider.system.namespaces"
const std::string _indexesName; // "alleyinsider.system.indexes"
int _profile; // 0=off.
// TODO: make sure deletes go through
// this in some ways is a dupe of _namespaceIndex
// but it points to a much more useful data structure
typedef StringMap< Collection* > CollectionMap;
CollectionMap _collections;
mongo::mutex _collectionLock;
friend class Collection;
friend class NamespaceDetails;
friend class IndexCatalog;
};
} // namespace mongo
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