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/**
* Copyright (C) 2019-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/bson/bsonobj.h"
#include "mongo/db/repl/oplog_entry.h"
#include "mongo/db/session/internal_session_pool.h"
namespace mongo {
namespace repl {
enum class ApplicationInstruction {
// Apply a normal oplog entry.
applyOplogEntry,
// Apply a prepared txn that is split from a top-level txn.
applySplitPreparedTxnOp,
// Apply a top-level prepared txn that can have multiple splits.
applyTopLevelPreparedTxnOp,
};
struct ApplierOperation {
const OplogEntry* op;
ApplicationInstruction instruction;
boost::optional<const InternalSessionPool::Session&> subSession;
boost::optional<std::vector<const OplogEntry*>> preparedTxnOps;
ApplierOperation(const OplogEntry* op,
ApplicationInstruction instruction = ApplicationInstruction::applyOplogEntry,
boost::optional<const InternalSessionPool::Session&> subSession = boost::none,
boost::optional<std::vector<const OplogEntry*>> preparedTxnOps = boost::none)
: op(op),
instruction(instruction),
subSession(subSession),
preparedTxnOps(preparedTxnOps) {}
ApplierOperation(const OplogEntry* op,
ApplicationInstruction instruction,
const std::vector<OplogEntry>& preparedTxnOps)
: op(op), instruction(instruction) {
this->preparedTxnOps.emplace();
this->preparedTxnOps->reserve(preparedTxnOps.size());
std::transform(preparedTxnOps.begin(),
preparedTxnOps.end(),
std::back_inserter(*this->preparedTxnOps),
[](const auto& op) -> const OplogEntry* { return &op; });
}
const OplogEntry* operator->() const {
return op;
}
const OplogEntry& operator*() const {
return *op;
}
};
/**
* This is a class for a single oplog entry or grouped inserts to be applied in
* applyOplogEntryOrGroupedInserts. This class is immutable and can only be initialized using
* either a single oplog entry or a range of grouped inserts.
*/
class OplogEntryOrGroupedInserts {
public:
using ConstIterator = std::vector<ApplierOperation>::const_iterator;
OplogEntryOrGroupedInserts() = delete;
// This initializes it as a single oplog entry.
OplogEntryOrGroupedInserts(ApplierOperation op) : _entryOrGroupedInserts({std::move(op)}) {}
// This initializes it as grouped inserts.
OplogEntryOrGroupedInserts(ConstIterator begin, ConstIterator end)
: _entryOrGroupedInserts(begin, end) {
// Performs sanity checks to confirm that the batch is valid.
invariant(!_entryOrGroupedInserts.empty());
for (const auto& op : _entryOrGroupedInserts) {
// Every oplog entry must be an insert.
invariant(op->getOpType() == OpTypeEnum::kInsert);
// Every oplog entry must be in the same namespace.
invariant(op->getNss() == _entryOrGroupedInserts.front()->getNss());
}
}
// Return the oplog entry to be applied or the first oplog entry of the grouped inserts.
const ApplierOperation& getOp() const {
return _entryOrGroupedInserts.front();
}
bool isGroupedInserts() const {
return _entryOrGroupedInserts.size() > 1;
}
const std::vector<ApplierOperation>& getGroupedInserts() const {
invariant(isGroupedInserts());
return _entryOrGroupedInserts;
}
// Returns a BSONObj for message logging purpose.
BSONObj toBSON() const;
private:
// A single oplog entry or a batch of grouped insert oplog entries to be applied.
std::vector<ApplierOperation> _entryOrGroupedInserts;
};
} // namespace repl
} // namespace mongo
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