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/**
* Copyright (C) 2018-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 <set>
#include "mongo/bson/timestamp.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/db/transactions_stats_gen.h"
namespace mongo {
/**
* Container for server-wide multi-document transaction statistics.
*/
class ServerTransactionsMetrics {
MONGO_DISALLOW_COPYING(ServerTransactionsMetrics);
public:
ServerTransactionsMetrics() = default;
static ServerTransactionsMetrics* get(ServiceContext* service);
static ServerTransactionsMetrics* get(OperationContext* opCtx);
unsigned long long getCurrentActive() const;
void decrementCurrentActive();
void incrementCurrentActive();
unsigned long long getCurrentInactive() const;
void decrementCurrentInactive();
void incrementCurrentInactive();
unsigned long long getCurrentOpen() const;
void decrementCurrentOpen();
void incrementCurrentOpen();
unsigned long long getTotalStarted() const;
void incrementTotalStarted();
unsigned long long getTotalAborted() const;
void incrementTotalAborted();
unsigned long long getTotalCommitted() const;
void incrementTotalCommitted();
/**
* Returns the Timestamp of the oldest oplog entry written across all open transactions.
* Returns boost::none if there are no transaction oplog entry Timestamps stored.
*/
boost::optional<Timestamp> getOldestActiveTS() const;
/**
* Add the transaction's oplog entry Timestamp to a set of Timestamps.
*/
void addActiveTS(Timestamp oldestOplogEntryTS);
/**
* Remove the corresponding transaction oplog entry Timestamp if the transaction commits or
* aborts.
*/
void removeActiveTS(Timestamp oldestOplogEntryTS);
/**
* Returns the number of transaction oplog entry Timestamps currently stored.
*/
unsigned int getTotalActiveTS() const;
/**
* Appends the accumulated stats to a transactions stats object.
*/
void updateStats(TransactionsStats* stats);
private:
// The number of multi-document transactions currently active.
AtomicUInt64 _currentActive{0};
// The number of multi-document transactions currently inactive.
AtomicUInt64 _currentInactive{0};
// The total number of open transactions.
AtomicUInt64 _currentOpen{0};
// The total number of multi-document transactions started since the last server startup.
AtomicUInt64 _totalStarted{0};
// The total number of multi-document transaction aborts.
AtomicUInt64 _totalAborted{0};
// The total number of multi-document transaction commits.
AtomicUInt64 _totalCommitted{0};
// Maintain the oldest oplog entry Timestamp across all active transactions. Currently, we only
// write an oplog entry for an ongoing transaction if it is in the `prepare` state. By
// maintaining an ordered set of timestamps, the timestamp at the beginning will be the oldest.
std::set<Timestamp> _oldestActiveOplogEntryTS;
};
} // namespace mongo
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