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// @file databaseholder.h
#pragma once
namespace mongo {
/**
* path + dbname -> Database
*/
class DatabaseHolder {
typedef map<string,Database*> DBs;
typedef map<string,DBs> Paths;
public:
DatabaseHolder() : _size(0) { }
bool __isLoaded( const string& ns , const string& path ) const {
Paths::const_iterator x = _paths.find( path );
if ( x == _paths.end() )
return false;
const DBs& m = x->second;
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 string& ns , const string& path ) const {
d.dbMutex.assertWriteLocked();
return __isLoaded(ns,path);
}
Database * get( const string& ns , const string& path ) const {
d.dbMutex.assertAtLeastReadLocked();
Paths::const_iterator x = _paths.find( path );
if ( x == _paths.end() )
return 0;
const DBs& m = x->second;
string db = _todb( ns );
DBs::const_iterator it = m.find(db);
if ( it != m.end() )
return it->second;
return 0;
}
void _put( const string& ns , const string& path , Database * db ) {
d.dbMutex.assertAtLeastReadLocked();
DBs& m = _paths[path];
Database*& d = m[_todb(ns)];
if( d ) {
dlog(2) << "info dbholder put db was already set " << ns << endl;
}
else {
_size++;
}
d = db;
}
Database* getOrCreate( const string& ns , const string& path , bool& justCreated );
void erase( const string& ns , const string& path ) {
d.dbMutex.assertWriteLocked(); // write lock req'd as a Database obj can be in use dbHolderMutex is mainly just to control the holder itself
DBs& m = _paths[path];
_size -= (int)m.erase( _todb( ns ) );
}
/** @param force - force close even if something underway - use at shutdown */
bool closeAll( const 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; }
void forEach(boost::function<void(Database *)> f) const {
d.dbMutex.assertWriteLocked();
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++ ) {
f(j->second);
}
}
}
/**
* gets all unique db names, ignoring paths
*/
void getAllShortNames( bool locked, set<string>& all ) const {
d.dbMutex.assertAtLeastReadLocked();
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 string _todb( const string& ns ) {
string d = __todb( ns );
uassert( 13280 , (string)"invalid db name: " + ns , NamespaceString::validDBName( d ) );
return d;
}
static string __todb( const string& ns ) {
size_t i = ns.find( '.' );
if ( i == 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 );
}
Paths _paths;
int _size;
};
DatabaseHolder& dbHolderUnchecked();
inline const DatabaseHolder& dbHolder() {
dassert( d.dbMutex.atLeastReadLocked() );
return dbHolderUnchecked();
}
inline DatabaseHolder& dbHolderW() {
dassert( d.dbMutex.isWriteLocked() );
return dbHolderUnchecked();
}
}
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