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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 "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/db/write_concern_options.h"
#include "mongo/util/string_map.h"
namespace mongo {
/**
* Container for server-wide statistics on writeConcern levels used by operations.
*/
class ServerWriteConcernMetrics {
ServerWriteConcernMetrics(const ServerWriteConcernMetrics&) = delete;
ServerWriteConcernMetrics& operator=(const ServerWriteConcernMetrics&) = delete;
public:
ServerWriteConcernMetrics() = default;
static ServerWriteConcernMetrics* get(ServiceContext* service);
static ServerWriteConcernMetrics* get(OperationContext* opCtx);
/**
* Updates the insert metrics 'numInserts' times according to the 'w' value of
* 'writeConcernOptions'.
*/
void recordWriteConcernForInserts(const WriteConcernOptions& writeConcernOptions,
size_t numInserts);
/**
* Updates the insert metrics according to the 'w' value of 'writeConcernOptions'.
*/
void recordWriteConcernForInsert(const WriteConcernOptions& writeConcernOptions) {
recordWriteConcernForInserts(writeConcernOptions, 1);
}
/**
* Updates the update metrics according to the 'w' value of 'writeConcernOptions'.
*/
void recordWriteConcernForUpdate(const WriteConcernOptions& writeConcernOptions);
/**
* Updates the delete metrics according to the 'w' value of 'writeConcernOptions'.
*/
void recordWriteConcernForDelete(const WriteConcernOptions& writeConcernOptions);
BSONObj toBSON() const;
private:
struct WriteConcernCounters {
WriteConcernCounters() = default;
WriteConcernCounters(bool exportWTag) : exportWTag(exportWTag) {}
// Count of operations with writeConcern w:"majority".
std::uint64_t wMajorityCount = 0;
// Counts of operations with writeConcern w:<num>.
std::map<int, std::uint64_t> wNumCounts;
// Set to true to include "wTag" section when exporting to BSON.
bool exportWTag = true;
// Counts of operations with writeConcern w:"tag".
StringMap<std::uint64_t> wTagCounts;
/**
* Updates counters for the 'w' value of 'writeConcernOptions'.
*/
void recordWriteConcern(const WriteConcernOptions& writeConcernOptions, size_t numOps);
void toBSON(BSONObjBuilder* builder) const;
};
struct WriteConcernMetricsForOperationType {
/**
* Updates the corresponding WC counters for the 'w' value of 'writeConcernOptions'.
*/
void recordWriteConcern(const WriteConcernOptions& writeConcernOptions, size_t numOps = 1);
void toBSON(BSONObjBuilder* builder) const;
// Counts of operations with writeConcern with 'w' value explicitly set by client.
WriteConcernCounters explicitWC;
// Counts of operations used cluster-wide writeConcern.
WriteConcernCounters cWWC;
// Counts of operations used implicit default writeConcern.
WriteConcernCounters implicitDefaultWC = WriteConcernCounters(false);
// Count of operations without an explicit writeConcern with "w" value.
std::uint64_t notExplicitWCount = 0;
};
mutable Mutex _mutex = MONGO_MAKE_LATCH("ServerWriteConcernMetrics::_mutex");
WriteConcernMetricsForOperationType _insertMetrics;
WriteConcernMetricsForOperationType _updateMetrics;
WriteConcernMetricsForOperationType _deleteMetrics;
};
} // namespace mongo
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