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/**
* Copyright (C) 2016 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/disallow_copying.h"
#include "mongo/db/namespace_string.h"
#include "mongo/s/catalog/type_chunk.h"
namespace mongo {
class BSONObj;
class Collection;
class OperationContext;
class CollectionRangeDeleter {
MONGO_DISALLOW_COPYING(CollectionRangeDeleter);
public:
CollectionRangeDeleter(NamespaceString nss);
/**
* Starts deleting ranges and cleans up this object when it is finished.
*/
void run();
/**
* Acquires the collection IX lock and checks whether there are new entries for the collection's
* rangesToClean structure. If there are, deletes up to maxToDelete entries and yields using
* the standard query yielding logic.
*
* Returns true if there are more entries in rangesToClean, false if there is no more progress
* to be made.
*/
bool cleanupNextRange(OperationContext* txn, int maxToDelete);
private:
/**
* Performs the deletion of up to maxToDelete entries within the range in progress.
* This function will invariant if called while _rangeInProgress is not set.
*
* Returns the number of documents deleted (0 if deletion is finished), or -1 for error.
*/
int _doDeletion(OperationContext* txn,
Collection* collection,
const BSONObj& keyPattern,
int maxToDelete);
NamespaceString _nss;
// Holds a range for which deletion has begun. If empty, then a new range
// must be requested from rangesToClean
boost::optional<ChunkRange> _rangeInProgress;
};
} // namespace mongo
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