Kea  2.3.8
isc::log::Logger Class Reference

Logger Class. More...

#include <logger.h>

Public Types

typedef isc::log::Formatter< LoggerFormatter
 The formatter used to replace placeholders. More...

Public Member Functions

 Logger (const char *name)
 Constructor. More...
virtual ~Logger ()
 Destructor. More...
Formatter debug (int dbglevel, const MessageID &ident)
 Output Debug Message. More...
Formatter error (const MessageID &ident)
 Output Error Message. More...
Formatter fatal (const MessageID &ident)
 Output Fatal Message. More...
virtual int getDebugLevel ()
 Return DEBUG Level. More...
virtual int getEffectiveDebugLevel ()
 Get Effective Debug Level for Logger. More...
virtual isc::log::Severity getEffectiveSeverity ()
 Get Effective Severity Level for Logger. More...
virtual std::string getName ()
 Get Name of Logger. More...
virtual isc::log::Severity getSeverity ()
 Get Severity Level for Logger. More...
bool hasAppender (OutputOption::Destination const destination)
 Check if this logger has an appender of the given type. More...
Formatter info (const MessageID &ident)
 Output Informational Message. More...
virtual bool isDebugEnabled (int dbglevel=MIN_DEBUG_LEVEL)
 Returns if Debug Message Should Be Output. More...
virtual bool isErrorEnabled ()
 Is ERROR Enabled? More...
virtual bool isFatalEnabled ()
 Is FATAL Enabled? More...
virtual bool isInfoEnabled ()
 Is INFO Enabled? More...
virtual bool isWarnEnabled ()
 Is WARNING Enabled? More...
bool operator== (Logger &other)
 Equality. More...
void setInterprocessSync (isc::log::interprocess::InterprocessSync *sync)
 Replace the interprocess synchronization object. More...
virtual void setSeverity (isc::log::Severity severity, int dbglevel=1)
 Set Severity Level for Logger. More...
Formatter warn (const MessageID &ident)
 Output Warning Message. More...

Static Public Member Functions

static std::string getVersion ()
 Version. More...

Static Public Attributes

static const size_t MAX_LOGGER_NAME_SIZE = 31
 Maximum size of a logger name. More...


class isc::log::Formatter< Logger >

Detailed Description

Logger Class.

This class is the main class used for logging. Use comprises:

  1. Constructing a logger by instantiating it with a specific name. (If the same logger is in multiple functions within a file, overhead can be minimized by declaring it as a file-wide static variable.)
  2. Using the error(), info() etc. methods to log an error. (However, it is recommended to use the LOG_ERROR, LOG_INFO etc. macros defined in macros.h. These will avoid the potentially-expensive evaluation of arguments if the severity is such that the message will be suppressed.)

Definition at line 142 of file log/logger.h.

Member Typedef Documentation

◆ Formatter

The formatter used to replace placeholders.

Definition at line 192 of file log/logger.h.

Constructor & Destructor Documentation

◆ Logger()

isc::log::Logger::Logger ( const char *  name)


Creates/attaches to a logger of a specific name.

nameName of the logger. If the name is that of the root name, this creates an instance of the root logger; otherwise it creates a child of the root logger.
The name of the logger may be no longer than MAX_LOGGER_NAME_SIZE else the program will throw an exception. This restriction allows loggers to be declared statically: the name is stored in a fixed-size array to avoid the need to allocate heap storage during program initialization (which causes problems on some operating systems).
Note also that there is no constructor taking a std::string. This minimizes the possibility of initializing a static logger with a string, so leading to problems mentioned above.

Definition at line 164 of file log/logger.h.

References isc_throw, and MAX_LOGGER_NAME_SIZE.

◆ ~Logger()

isc::log::Logger::~Logger ( )


Definition at line 51 of file log/

Member Function Documentation

◆ debug()

Logger::Formatter isc::log::Logger::debug ( int  dbglevel,
const MessageID ident 

Output Debug Message.

dbglevelDebug level, ranging between 0 and 99. Higher numbers are used for more verbose output.
identMessage identification.

Definition at line 151 of file log/

References isc::log::DEBUG.

◆ error()

Logger::Formatter isc::log::Logger::error ( const MessageID ident)

Output Error Message.

identMessage identification.

Definition at line 181 of file log/

References isc::log::ERROR.

Referenced by isc::log::LoggerManager::readLocalMessageFile().

◆ fatal()

Logger::Formatter isc::log::Logger::fatal ( const MessageID ident)

Output Fatal Message.

identMessage identification.

Definition at line 191 of file log/

References isc::log::FATAL.

◆ getDebugLevel()

int isc::log::Logger::getDebugLevel ( )

Return DEBUG Level.

Current setting of debug level. This is returned regardless of whether the severity is set to debug.

Definition at line 97 of file log/

◆ getEffectiveDebugLevel()

int isc::log::Logger::getEffectiveDebugLevel ( )

Get Effective Debug Level for Logger.

The effective debug level of the logger. This is the same as getDebugLevel() if the logger has a debug level set, but otherwise is the debug level of the parent.

Definition at line 105 of file log/

◆ getEffectiveSeverity()

isc::log::Severity isc::log::Logger::getEffectiveSeverity ( )

Get Effective Severity Level for Logger.

The effective severity level of the logger. This is the same as getSeverity() if the logger has a severity level set, but otherwise is the severity of the parent.

Definition at line 90 of file log/

◆ getName()

std::string isc::log::Logger::getName ( )

Get Name of Logger.

The full name of the logger (including the root name)

Definition at line 69 of file log/

◆ getSeverity()

isc::log::Severity isc::log::Logger::getSeverity ( )

Get Severity Level for Logger.

The current logging level of this logger. In most cases though, the effective logging level is what is required.

Definition at line 83 of file log/

References isc::log::getSeverity().

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◆ getVersion()

std::string isc::log::Logger::getVersion ( )


Definition at line 62 of file log/

Referenced by isc::process::DControllerBase::getVersion().

◆ hasAppender()

bool isc::log::Logger::hasAppender ( OutputOption::Destination const  destination)

Check if this logger has an appender of the given type.

destinationthe appender type to be checked: console, file or syslog
true if an appender of the given type is found, false otherwise

Definition at line 208 of file log/

◆ info()

Logger::Formatter isc::log::Logger::info ( const MessageID ident)

Output Informational Message.

identMessage identification.

Definition at line 161 of file log/

References isc::log::INFO.

Referenced by isc::log::LoggerManager::readLocalMessageFile().

◆ isDebugEnabled()

bool isc::log::Logger::isDebugEnabled ( int  dbglevel = MIN_DEBUG_LEVEL)

Returns if Debug Message Should Be Output.

dbglevelLevel for which debugging is checked. Debugging is enabled only if the logger has DEBUG enabled and if the dbglevel checked is less than or equal to the debug level set for the logger.

Definition at line 112 of file log/

◆ isErrorEnabled()

bool isc::log::Logger::isErrorEnabled ( )

Is ERROR Enabled?

Definition at line 127 of file log/

◆ isFatalEnabled()

bool isc::log::Logger::isFatalEnabled ( )

Is FATAL Enabled?

Definition at line 132 of file log/

◆ isInfoEnabled()

bool isc::log::Logger::isInfoEnabled ( )

Is INFO Enabled?

Definition at line 117 of file log/

◆ isWarnEnabled()

bool isc::log::Logger::isWarnEnabled ( )

Is WARNING Enabled?

Definition at line 122 of file log/

◆ operator==()

bool isc::log::Logger::operator== ( Logger other)


Check if two instances of this logger refer to the same stream.

true if the logger objects are instances of the same logger.

Definition at line 215 of file log/

◆ setInterprocessSync()

void isc::log::Logger::setInterprocessSync ( isc::log::interprocess::InterprocessSync sync)

Replace the interprocess synchronization object.

If this method is called with null as the argument, it throws a BadInterprocessSync exception.

This method is intended to be used only within this log library and its tests. Normal application shouldn't use it (in fact, normal application shouldn't even be able to instantiate InterprocessSync objects).
syncThe logger uses this synchronization object for synchronizing output of log messages. It should be deletable and the ownership is transferred to the logger. If null is passed, a BadInterprocessSync exception is thrown.

Definition at line 203 of file log/

Referenced by isc::log::LoggerManager::readLocalMessageFile().

◆ setSeverity()

void isc::log::Logger::setSeverity ( isc::log::Severity  severity,
int  dbglevel = 1 

Set Severity Level for Logger.

Sets the level at which this logger will log messages. If none is set, the level is inherited from the parent.

severitySeverity level to log
dbglevelIf the severity is DEBUG, this is the debug level. This can be in the range 1 to 100 and controls the verbosity. A value outside these limits is silently coerced to the nearest boundary.

Definition at line 76 of file log/

◆ warn()

Logger::Formatter isc::log::Logger::warn ( const MessageID ident)

Output Warning Message.

identMessage identification.

Definition at line 171 of file log/

References isc::log::WARN.

Referenced by isc::log::LoggerManager::readLocalMessageFile().

Friends And Related Function Documentation

◆ isc::log::Formatter< Logger >

friend class isc::log::Formatter< Logger >

Definition at line 310 of file log/logger.h.

Member Data Documentation


const size_t isc::log::Logger::MAX_LOGGER_NAME_SIZE = 31

Maximum size of a logger name.

Definition at line 145 of file log/logger.h.

Referenced by Logger().

The documentation for this class was generated from the following files: