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77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
// dbinfo.h
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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namespace mongo {
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/* this is an "accessor" class to data held in local.dbinfo.<dbname>
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system.dbinfo contains:
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{ haveLogged : true }
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haveLogged -- if true, we have already logged events to the oplog for this
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database. missing implies false.
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other attributes will be added later.
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Note that class Database caches the DBInfo::haveLogged() value to keep things fast.
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*/
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class DBInfo {
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string ns;
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Database *dbold;
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public:
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~DBInfo() {
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database = dbold;
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}
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DBInfo(const char *db) {
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dbold = database;
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ns = string("local.dbinfo.") + db;
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setClientTempNs(ns.c_str());
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}
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BSONObj getDbInfoObj() {
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auto_ptr<Cursor> c = DataFileMgr::findAll(ns.c_str());
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if ( !c->ok() )
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return BSONObj();
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return c->current();
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}
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bool haveLogged() {
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return getDbInfoObj().getBoolField("haveLogged");
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}
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void setHaveLogged();
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void dbDropped();
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};
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inline void Database::setHaveLogged() {
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if ( _haveLogged ) return;
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DBInfo i(name.c_str());
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i.setHaveLogged();
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_haveLogged = true;
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}
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inline void Database::finishInit() {
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DBInfo i(name.c_str());
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_haveLogged = i.haveLogged();
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}
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} // namespace mongo
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