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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 <iosfwd>
#include <string>
#include "mongo/base/string_data.h"
namespace mongo {
namespace logger {
/**
* Representation of the severity / priority of a log message.
*
* Severities are totally ordered, from most severe to least severe as follows:
* Severe, Error, Warning, Info, Log, Debug(1), Debug(2), ...
*/
class LogSeverity {
public:
//
// Static factory methods for getting LogSeverity objects of the various severity levels.
//
static inline LogSeverity Severe();
static inline LogSeverity Error();
static inline LogSeverity Warning();
static inline LogSeverity Info();
static inline LogSeverity Log(); // === Debug(0)
static inline LogSeverity Debug(int debugLevel);
/**
* Casts an integer to a severity.
*
* Do not use this. It exists to enable a handful of leftover uses of LOG(0).
*/
static inline LogSeverity cast(int);
inline int toInt() const;
/**
* Returns a LogSeverity object that is one unit "more severe" than this one.
*/
inline LogSeverity moreSevere() const;
/**
* Returns a LogSeverity object that is one unit "less severe" than this one.
*/
inline LogSeverity lessSevere() const;
/**
* Returns a std::string naming this severity level.
*
* See toStringData(), below.
*/
inline std::string toString() const;
/**
* Returns a StringData naming this security level.
*
* Not all levels are uniquely named. Debug(N) is named "debug", regardless of "N",
* e.g.
*/
StringData toStringData() const;
/**
* Returns a single capital letter naming this severity level.
* Equivalent to upper-case of first letter of toStringData() result.
*
* Not all levels are uniquely named.
*/
char toChar() const;
//
// Comparison operations.
//
/// Returns true if this is exactly as severe as other.
inline bool operator==(const LogSeverity other) const;
/// Returns true if this is not exactly as severe as other.
inline bool operator!=(const LogSeverity other) const;
/// Returns true if this is less severe than other.
inline bool operator<(const LogSeverity other) const;
/// Returns true if this is no more severe than other.
inline bool operator<=(const LogSeverity other) const;
/// Returns true if this is more severe than other.
inline bool operator>(const LogSeverity other) const;
/// Returns true if this is no less severe than other.
inline bool operator>=(const LogSeverity other) const;
private:
explicit LogSeverity(int severity) : _severity(severity) {}
/// The stored severity. More negative is more severe. NOTE: This means that the >, <, >=
/// and <= operators on LogSeverity have opposite sense of the same operators on the
/// underlying integer. That is, given severities S1 and S2, S1 > S2 means that S1.toInt()
/// < S2.toInt().
///
/// TODO(schwerin): Decide if we should change this so more positive is more severe. The
/// logLevel parameter in the database is more compatible with this sense, but it's not
/// totally intuitive. One could also remove the operator overloads in favor of named
/// methods, isNoMoreSevereThan, isLessSevereThan, isMoreSevereThan, isNoLessSevereThan,
/// isSameSeverity and isDifferentSeverity.
int _severity;
};
std::ostream& operator<<(std::ostream& os, LogSeverity severity);
} // namespace logger
} // namespace mongo
#include "mongo/logger/log_severity-inl.h"
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