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// @file databaseholder.h
/**
* Copyright (C) 2012 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/db/catalog/database.h"
#include "mongo/db/d_concurrency.h"
#include "mongo/db/namespace_string.h"
namespace mongo {
/**
* path + dbname -> Database
*/
class DatabaseHolder {
typedef std::map<std::string,Database*> DBs;
typedef std::map<std::string,DBs> Paths;
// todo: we want something faster than this if called a lot:
mutable SimpleMutex _m;
Paths _paths;
int _size;
public:
DatabaseHolder() : _m("dbholder"),_size(0) { }
bool __isLoaded( const std::string& ns , const std::string& path ) const {
SimpleMutex::scoped_lock lk(_m);
Paths::const_iterator x = _paths.find( path );
if ( x == _paths.end() )
return false;
const DBs& m = x->second;
std::string db = _todb( ns );
DBs::const_iterator it = m.find(db);
return it != m.end();
}
// must be write locked as otherwise isLoaded could go false->true on you
// in the background and you might not expect that.
bool _isLoaded( const std::string& ns , const std::string& path ) const {
Lock::assertWriteLocked(ns);
return __isLoaded(ns,path);
}
Database * get( const std::string& ns , const std::string& path ) const {
SimpleMutex::scoped_lock lk(_m);
Lock::assertAtLeastReadLocked(ns);
Paths::const_iterator x = _paths.find( path );
if ( x == _paths.end() )
return 0;
const DBs& m = x->second;
std::string db = _todb( ns );
DBs::const_iterator it = m.find(db);
if ( it != m.end() )
return it->second;
return 0;
}
Database* getOrCreate( const std::string& ns , const std::string& path , bool& justCreated );
void erase( const std::string& ns , const std::string& path ) {
SimpleMutex::scoped_lock lk(_m);
verify( Lock::isW() );
DBs& m = _paths[path];
_size -= (int)m.erase( _todb( ns ) );
}
/** @param force - force close even if something underway - use at shutdown */
bool closeAll( const std::string& path , BSONObjBuilder& result, bool force );
// "info" as this is informational only could change on you if you are not write locked
int sizeInfo() const { return _size; }
/**
* gets all unique db names, ignoring paths
* need some lock
*/
void getAllShortNames( std::set<std::string>& all ) const {
SimpleMutex::scoped_lock lk(_m);
for ( Paths::const_iterator i=_paths.begin(); i!=_paths.end(); i++ ) {
DBs m = i->second;
for( DBs::const_iterator j=m.begin(); j!=m.end(); j++ ) {
all.insert( j->first );
}
}
}
private:
static std::string _todb( const std::string& ns ) {
std::string d = __todb( ns );
uassert( 13280 , (std::string)"invalid db name: " + ns , NamespaceString::validDBName( d ) );
return d;
}
static std::string __todb( const std::string& ns ) {
size_t i = ns.find( '.' );
if ( i == std::string::npos ) {
uassert( 13074 , "db name can't be empty" , ns.size() );
return ns;
}
uassert( 13075 , "db name can't be empty" , i > 0 );
return ns.substr( 0 , i );
}
};
DatabaseHolder& dbHolderUnchecked();
inline const DatabaseHolder& dbHolder() {
dassert( Lock::isLocked() );
return dbHolderUnchecked();
}
inline DatabaseHolder& dbHolderW() {
dassert( Lock::isW() );
return dbHolderUnchecked();
}
}
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