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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/logv2/log_component.h"
#include "mongo/logv2/log_severity.h"
#include "mongo/platform/atomic_word.h"
#include "mongo/platform/mutex.h"
namespace mongo {
namespace logv2 {
/**
* Contains log severities for a list of log components.
* kDefault always has a log severity defined but it is not necessary to
* provide log severities for the other components (up to but not including kNumLogComponents).
*/
class LogComponentSettings {
LogComponentSettings(const LogComponentSettings&) = delete;
LogComponentSettings& operator=(const LogComponentSettings&) = delete;
public:
LogComponentSettings();
~LogComponentSettings();
/**
* Returns true if a minimum log severity has been set for this component.
* Used by log level commands to query component severity configuration.
*/
bool hasMinimumLogSeverity(LogComponent component) const;
/**
* Gets the minimum log severity for component.
* Result is defined only if hasMinimumLogSeverity() returns true for component.
*/
LogSeverity getMinimumLogSeverity(LogComponent component) const;
/**
* Sets the minimum log severity for component.
*/
void setMinimumLoggedSeverity(LogComponent component, LogSeverity severity);
/**
* Clears the minimum log severity for component.
* For kDefault, severity level is initialized to default value.
*/
void clearMinimumLoggedSeverity(LogComponent component);
/**
* Predicate that answers the question, "Should I, the caller, append to you, the log
* domain, componented messages of the given severity?" True means yes.
*
* If minimum severity levels are not configured, compare 'severity' against the configured
* level for kDefault.
*/
bool shouldLog(LogComponent component, LogSeverity severity) const;
private:
void _setMinimumLoggedSeverityInLock(LogComponent component, LogSeverity severity);
// A mutex to synchronize writes to the severity arrays. This mutex is to synchronize changes to
// the entire array, and the atomics are to synchronize individual elements.
Mutex _mtx = MONGO_MAKE_LATCH("LogComponentSettings::_mtx");
// True if a log severity is explicitly set for a component.
// This differentiates between unconfigured components and components that happen to have
// the same severity as kDefault.
// This is also used to update the severities of unconfigured components when the severity
// for kDefault is modified.
AtomicWord<bool> _hasMinimumLoggedSeverity[LogComponent::kNumLogComponents];
// Log severities for components.
// Store numerical values of severities to be cache-line friendly.
// Set to kDefault minimum logged severity if _hasMinimumLoggedSeverity[i] is false.
AtomicWord<int> _minimumLoggedSeverity[LogComponent::kNumLogComponents];
};
} // namespace logv2
} // namespace mongo
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