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// state.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/base/disallow_copying.h"
#include "mongo/db/diskloc.h"
#include "mongo/db/jsobj.h"
#include "mongo/bson/ordering.h"
namespace mongo {
class Collection;
class IndexDetails;
class IndexDescriptor;
class NamesapceDetails;
class RecordStore;
/**
* This class is maybe temporary, and terribly named
* its goal is to keep the state and data structure associated with a btree in one place
* previously, the btree code called back out of its world through globals, which is bad
* the goal here is to make the btree at least a sane visitorish pattern
* so this is passed to each method, and it can be operated on
* long term, the containmenent should be flipped
*/
class BtreeInMemoryState {
MONGO_DISALLOW_COPYING( BtreeInMemoryState );
public:
BtreeInMemoryState( Collection* collection,
const IndexDescriptor* descriptor,
RecordStore* recordStore,
IndexDetails* details );
const Collection* collection() const { return _collection; }
const IndexDescriptor* descriptor() const { return _descriptor; }
const Ordering& ordering() const { return _ordering; }
RecordStore* recordStore() { return _recordStore.get(); }
const RecordStore* recordStore() const { return _recordStore.get(); }
// ----
const DiskLoc& head() const;
void setHead( DiskLoc newHead );
void setMultikey();
// ------------
template< class V >
const BtreeBucket<V>* getHeadBucket() const { return getBucket<V>( head() ); }
template< class V >
const BtreeBucket<V>* getBucket( const DiskLoc& loc ) const;
private:
// the collection this index is over, not storage for the index
Collection* _collection; // not-owned here
const IndexDescriptor* _descriptor; // not-owned here
// the record store for this index (where its buckets go)
scoped_ptr<RecordStore> _recordStore; // OWNED HERE
IndexDetails* _indexDetails; // TODO: remove
Ordering _ordering;
};
}
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