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/**
* Copyright (C) 2013 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 <vector>
#include "mongo/base/disallow_copying.h"
#include "mongo/db/diskloc.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/index/index_access_method.h"
#include "mongo/db/index/index_cursor.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/structure/btree/btree_interface.h"
namespace mongo {
class ExternalSortComparison;
/**
* Any access method that is Btree based subclasses from this.
*
* Subclassers must:
* 1. Call the constructor for this class from their constructors, and
* 2. override getKeys.
*
* XXX: Should really think of the sub-class as providing an expression mapping of the input,
* don't need so many AMs, just really precomputing some data and mapping doc for getKeys(?).
* See SERVER-12397 for tracking.
*/
class BtreeBasedAccessMethod : public IndexAccessMethod {
MONGO_DISALLOW_COPYING( BtreeBasedAccessMethod );
public:
BtreeBasedAccessMethod( IndexCatalogEntry* btreeState );
virtual ~BtreeBasedAccessMethod() { }
virtual Status insert(OperationContext* txn,
const BSONObj& obj,
const DiskLoc& loc,
const InsertDeleteOptions& options,
int64_t* numInserted);
virtual Status remove(OperationContext* txn,
const BSONObj& obj,
const DiskLoc& loc,
const InsertDeleteOptions& options,
int64_t* numDeleted);
virtual Status validateUpdate(const BSONObj& from,
const BSONObj& to,
const DiskLoc& loc,
const InsertDeleteOptions& options,
UpdateTicket* ticket);
virtual Status update(OperationContext* txn,
const UpdateTicket& ticket,
int64_t* numUpdated);
virtual Status newCursor(IndexCursor **out) const;
virtual Status initializeAsEmpty(OperationContext* txn);
virtual IndexAccessMethod* initiateBulk(OperationContext* txn) ;
virtual Status commitBulk( IndexAccessMethod* bulk,
bool mayInterrupt,
std::set<DiskLoc>* dups );
virtual Status touch(const BSONObj& obj);
virtual Status touch(OperationContext* txn) const;
virtual Status validate(int64_t* numKeys);
// XXX: consider migrating callers to use IndexCursor instead
virtual DiskLoc findSingle( const BSONObj& key ) const;
protected:
// Friends who need getKeys.
friend class BtreeBasedBulkAccessMethod;
// See below for body.
class BtreeBasedPrivateUpdateData;
virtual void getKeys(const BSONObj &obj, BSONObjSet *keys) = 0;
IndexCatalogEntry* _btreeState; // owned by IndexCatalogEntry
const IndexDescriptor* _descriptor;
/**
* The collection is needed for resolving record locations to actual objects.
*/
const Collection* collection() const {
return _btreeState->collection();
}
private:
bool removeOneKey(OperationContext* txn,
const BSONObj& key,
const DiskLoc& loc);
scoped_ptr<BtreeInterface> _newInterface;
};
/**
* What data do we need to perform an update?
*/
class BtreeBasedAccessMethod::BtreeBasedPrivateUpdateData
: public UpdateTicket::PrivateUpdateData {
public:
virtual ~BtreeBasedPrivateUpdateData() { }
BSONObjSet oldKeys, newKeys;
// These point into the sets oldKeys and newKeys.
vector<BSONObj*> removed, added;
DiskLoc loc;
bool dupsAllowed;
};
} // namespace mongo
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