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/**
* Copyright (C) 2018 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/base/status_with.h"
#include "mongo/db/repl/multiapplier.h"
#include "mongo/db/repl/sync_tail.h"
namespace mongo {
namespace repl {
/**
* Collection of helper functions and classes for oplog application.
*/
class ApplierHelpers {
public:
using OperationPtrs = MultiApplier::OperationPtrs;
/**
* Sorts the oplog entries by namespace, so that entries from the same namespace will be next to
* each other in the list.
*/
static void stableSortByNamespace(OperationPtrs* oplogEntryPointers);
class InsertGroup;
};
/**
* Groups consecutive insert operations on the same namespace and applies the combined operation
* as a single oplog entry.
* Advances the the MultiApplier::OperationPtrs iterator if the grouped insert is applied
* successfully.
*/
class ApplierHelpers::InsertGroup {
MONGO_DISALLOW_COPYING(InsertGroup);
public:
using ConstIterator = OperationPtrs::const_iterator;
using Mode = OplogApplication::Mode;
InsertGroup(OperationPtrs* ops, const SyncApplyFn& applyFn, OperationContext* opCtx, Mode mode);
/**
* Attempts to group insert operations starting at 'iter'.
* If the grouped insert is applied successfully, returns the iterator to the last standalone
* insert operation included in the applied grouped insert.
*/
StatusWith<ConstIterator> groupAndApplyInserts(ConstIterator oplogEntriesIterator);
private:
// _doNotGroupBeforePoint is used to prevent retrying bad group inserts by marking the final op
// of a failed group and not allowing further group inserts until that op has been processed.
ConstIterator _doNotGroupBeforePoint;
// Used for constructing search bounds when grouping inserts.
ConstIterator _end;
// Used to apply the grouped insert oplog entry.
const SyncApplyFn _applyFn;
// Passed to _syncApply when applying grouped inserts.
OperationContext* _opCtx;
Mode _mode;
};
} // namespace repl
} // namespace mongo
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