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// database_holder.cpp
/**
* 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.
*/
#include "mongo/pch.h"
#include "mongo/db/auth/auth_index_d.h"
#include "mongo/db/background.h"
#include "mongo/db/client.h"
#include "mongo/db/clientcursor.h"
#include "mongo/db/catalog/database_holder.h"
#include "mongo/db/d_concurrency.h"
#include "mongo/db/operation_context_impl.h"
#include "mongo/db/storage/mmap_v1/dur.h"
namespace mongo {
Database* DatabaseHolder::getOrCreate( const string& ns, const string& path, bool& justCreated ) {
OperationContextImpl txn; // TODO get rid of this once reads require transactions
string dbname = _todb( ns );
{
SimpleMutex::scoped_lock lk(_m);
Lock::assertAtLeastReadLocked(ns);
DBs& m = _paths[path];
{
DBs::iterator i = m.find(dbname);
if( i != m.end() ) {
justCreated = false;
return i->second;
}
}
// todo: protect against getting sprayed with requests for different db names that DNE -
// that would make the DBs map very large. not clear what to do to handle though,
// perhaps just log it, which is what we do here with the "> 40" :
bool cant = !Lock::isWriteLocked(ns);
if( logger::globalLogDomain()->shouldLog(logger::LogSeverity::Debug(1)) ||
m.size() > 40 || cant || DEBUG_BUILD ) {
log() << "opening db: "
<< (path == storageGlobalParams.dbpath ? "" : path) << ' ' << dbname
<< endl;
}
massert(15927, "can't open database in a read lock. if db was just closed, consider retrying the query. might otherwise indicate an internal error", !cant);
}
// we mark our thread as having done writes now as we do not want any exceptions
// once we start creating a new database
cc().writeHappened();
// this locks _m for defensive checks, so we don't want to be locked right here :
Database *db = new Database( &txn, dbname.c_str() , justCreated , path );
{
SimpleMutex::scoped_lock lk(_m);
DBs& m = _paths[path];
verify( m[dbname] == 0 );
m[dbname] = db;
_size++;
}
return db;
}
bool DatabaseHolder::closeAll( const string& path , BSONObjBuilder& result , bool force ) {
log() << "DatabaseHolder::closeAll path:" << path << endl;
verify( Lock::isW() );
getDur().commitNow(); // bad things happen if we close a DB with outstanding writes
map<string,Database*>& m = _paths[path];
_size -= m.size();
set< string > dbs;
for ( map<string,Database*>::iterator i = m.begin(); i != m.end(); i++ ) {
wassert( i->second->path() == path );
dbs.insert( i->first );
}
currentClient.get()->getContext()->_clear();
BSONObjBuilder bb( result.subarrayStart( "dbs" ) );
int n = 0;
int nNotClosed = 0;
for( set< string >::iterator i = dbs.begin(); i != dbs.end(); ++i ) {
string name = *i;
LOG(2) << "DatabaseHolder::closeAll path:" << path << " name:" << name << endl;
Client::Context ctx( name , path );
if( !force && BackgroundOperation::inProgForDb(name) ) {
log() << "WARNING: can't close database " << name << " because a bg job is in progress - try killOp command" << endl;
nNotClosed++;
}
else {
Database::closeDatabase( name.c_str() , path );
bb.append( bb.numStr( n++ ) , name );
}
}
bb.done();
if( nNotClosed ) {
result.append("nNotClosed", nNotClosed);
}
return true;
}
}
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