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/* Copyright 2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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/base/disallow_copying.h"
#include "mongo/logger/log_component.h"
#include "mongo/logger/log_severity.h"
#include "mongo/platform/atomic_word.h"
#include "mongo/stdx/mutex.h"
namespace mongo {
namespace logger {
/**
* 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 {
MONGO_DISALLOW_COPYING(LogComponentSettings);
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.
stdx::mutex _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.
AtomicBool _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.
AtomicInt32 _minimumLoggedSeverity[LogComponent::kNumLogComponents];
};
} // namespace logger
} // namespace mongo
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