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/**
* Copyright (C) 2013-2014 MongoDB 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/string_data.h"
#include "mongo/db/query/plan_executor.h"
#include "mongo/db/record_id.h"
namespace mongo {
class BSONObj;
class Collection;
class IndexDescriptor;
class OperationContext;
class PlanStage;
class WorkingSet;
struct DeleteStageParams;
/**
* The internal planner is a one-stop shop for "off-the-shelf" plans. Most internal procedures
* that do not require advanced queries could be served by plans already in here.
*/
class InternalPlanner {
public:
enum Direction {
FORWARD = 1,
BACKWARD = -1,
};
enum IndexScanOptions {
// The client is interested in the default outputs of an index scan: BSONObj of the key,
// RecordId of the record that's indexed. The client does its own fetching if required.
IXSCAN_DEFAULT = 0,
// The client wants the fetched object and the RecordId that refers to it. Delegating
// the fetch to the runner allows fetching outside of a lock.
IXSCAN_FETCH = 1,
};
/**
* Returns a collection scan. Caller owns pointer.
*/
static std::unique_ptr<PlanExecutor> collectionScan(OperationContext* txn,
StringData ns,
Collection* collection,
PlanExecutor::YieldPolicy yieldPolicy,
const Direction direction = FORWARD,
const RecordId startLoc = RecordId());
/**
* Returns a FETCH => DELETE plan.
*/
static std::unique_ptr<PlanExecutor> deleteWithCollectionScan(
OperationContext* txn,
Collection* collection,
const DeleteStageParams& params,
PlanExecutor::YieldPolicy yieldPolicy,
Direction direction = FORWARD,
const RecordId& startLoc = RecordId());
/**
* Returns an index scan. Caller owns returned pointer.
*/
static std::unique_ptr<PlanExecutor> indexScan(OperationContext* txn,
const Collection* collection,
const IndexDescriptor* descriptor,
const BSONObj& startKey,
const BSONObj& endKey,
BoundInclusion boundInclusion,
PlanExecutor::YieldPolicy yieldPolicy,
Direction direction = FORWARD,
int options = IXSCAN_DEFAULT);
/**
* Returns an IXSCAN => FETCH => DELETE plan.
*/
static std::unique_ptr<PlanExecutor> deleteWithIndexScan(OperationContext* txn,
Collection* collection,
const DeleteStageParams& params,
const IndexDescriptor* descriptor,
const BSONObj& startKey,
const BSONObj& endKey,
BoundInclusion boundInclusion,
PlanExecutor::YieldPolicy yieldPolicy,
Direction direction = FORWARD);
private:
/**
* Returns a plan stage that can be used for a collection scan.
*
* Used as a helper for collectionScan() and deleteWithCollectionScan().
*/
static std::unique_ptr<PlanStage> _collectionScan(OperationContext* txn,
WorkingSet* ws,
const Collection* collection,
Direction direction,
const RecordId& startLoc);
/**
* Returns a plan stage that is either an index scan or an index scan with a fetch stage.
*
* Used as a helper for indexScan() and deleteWithIndexScan().
*/
static std::unique_ptr<PlanStage> _indexScan(OperationContext* txn,
WorkingSet* ws,
const Collection* collection,
const IndexDescriptor* descriptor,
const BSONObj& startKey,
const BSONObj& endKey,
BoundInclusion boundInclusion,
Direction direction = FORWARD,
int options = IXSCAN_DEFAULT);
};
} // namespace mongo
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