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Дата изменения: Tue Dec 28 20:59:06 2004
Дата индексирования: Sun Apr 10 00:13:06 2016
Кодировка:

ucar.util
Interface Logger

All Known Implementing Classes:

AbstractLogger, RMILogger

public interface Logger

This interface provides logging functions for daemon applications such as servers. It looks a lot like UCAR's ulog(3) C language interface, which in turn looks like the UNIX syslog(3C) client interface.

Log messages are tagged with a numeric logging level, selected from the ordered list of constants below. Higher levels are more verbose. An implementation would use the level of a message to decide where and whether to write the message.

The three lowest logging levels, EMERG, ALERT, and CRIT, should probably never be assigned by user (non-kernel or non JVM?) code.

Note: By default, the shorthand methods are silent in the face of internal exceptions.

Field Summary

static int	ALERT Log level for messages indicating that action must be taken immediately.
static int	CRIT Log level for messages indicating critical conditions.
static int	DEBUG Log level for debug messages
static int	EMERG Log level for messages indicating that the system is unusable.
static int	ERR Log level for error messages.
static int	INFO Log level for informational (verbose) messages.
static int	NOTICE Log level for messages indicating a normal but significant condition.
static int	WARNING Log level for warnings.

Method Summary

void	log(int level, java.lang.String message) Arrange to log the message at the given level.
void	logDebug(java.lang.String message) Shorthand for log(Logger.DEBUG, message).
void	logError(java.lang.String message) Shorthand for log(Logger.ERR, message).
void	logInfo(java.lang.String message) Shorthand for log(Logger.INFO, message).
void	logNotice(java.lang.String message) Shorthand for log(Logger.NOTICE, message).
void	logUpTo(int maxLevel) Control the verbosity of the implementation.

Field Detail

EMERG

public static final int EMERG

Log level for messages indicating that the system is unusable. Included only for syslog compatiblity.

ALERT

public static final int ALERT

Log level for messages indicating that action must be taken immediately. Included only for syslog compatiblity.

CRIT

public static final int CRIT

Log level for messages indicating critical conditions. Included only for syslogd compatiblity.

ERR

public static final int ERR

Log level for error messages. Included only for syslog compatiblity.

WARNING

public static final int WARNING

Log level for warnings.

NOTICE

public static final int NOTICE

Log level for messages indicating a normal but significant condition.

INFO

public static final int INFO

Log level for informational (verbose) messages.

DEBUG

public static final int DEBUG

Log level for debug messages

Method Detail

logUpTo

public void logUpTo(int maxLevel)

Control the verbosity of the implementation. Messages tagged with level above maxLevel may be discarded.

log

public void log(int level,
                java.lang.String message)
         throws java.io.IOException

Arrange to log the message at the given level.

Parameters:

level - Int value which is one of EMERG, ALERT, CRIT, ERR, WARNING, NOTICE, INFO, or DEBUG.

String - message to be logged.

logError

public void logError(java.lang.String message)

Shorthand for log(Logger.ERR, message).

See Also:

ERR, log(int, java.lang.String)

logNotice

public void logNotice(java.lang.String message)

Shorthand for log(Logger.NOTICE, message).

See Also:

NOTICE, log(int, java.lang.String)

logInfo

public void logInfo(java.lang.String message)

Shorthand for log(Logger.INFO, message).

See Also:

INFO, log(int, java.lang.String)

logDebug

public void logDebug(java.lang.String message)

Shorthand for log(Logger.DEBUG, message).

See Also:

DEBUG, log(int, java.lang.String)