com.isomorphic.log

Class Logger

com.isomorphic.log.Logger

public class Logger

Logger provides a mechanism for tracking log messages. Isomorphic SmartClient server-side logging is based on Apache's open source log4j API. For more general information on log4j, see this "Short introduction to log4j" on the Apache website. The logging priorities used in the Isomorphic SmartClient framework are:

• fatal--unrecoverable error, the program will probably crash
• error--recoverable error, the program may become unstable
• warning--unusual data or a risky operation is about to be attempted
• info--interesting events worth noting
• debug--any message that aids in debugging to track system progress

The methods in the Logger class can be used to log debug, warning, or error messages from classes running in the Isomorphic SmartClient environment. To create a new logger to track messages by class name, place the following line of code at the top of the class definition:

private static Logger log = new Logger(myClass.class.getName());

Constructor Summary

Constructors

Constructor and Description
Logger(java.lang.Class objClass) Constructs Logger object using className of provided Class as logging category.
Logger(java.lang.String subsystem) Constructs Logger object using provided subsystem as logging category.

Method Summary

Methods

Modifier and Type	Method and Description
void	debug(java.lang.Object message) Logs a message with "debug" status.
void	error(java.lang.Object message) Logs a message with "error" status.
void	fatal(java.lang.Object message) Logs a message with "fatal" status.
void	info(java.lang.Object message, java.lang.Throwable t) Logs a message with "info" status.
boolean	isDebugEnabled() Checks if the logger has been enabled to allow debug messages.
boolean	isErrorEnabled() Checks if the logger has been enabled to allow error messages.
boolean	isFatalEnabled() Checks if the logger has been enabled to allow fatal messages.
boolean	isInfoEnabled() Checks if the logger has been enabled to allow info messages.
boolean	isWarnEnabled() Checks if the logger has been enabled to allow warning messages.
void	warning(java.lang.Object message) Logs a message with "warning" status.

Constructor Detail

Logger

public Logger(java.lang.Class objClass)

Constructs Logger object using className of provided Class as logging category.

Logger

public Logger(java.lang.String subsystem)

Constructs Logger object using provided subsystem as logging category.

Method Detail

fatal

public void fatal(java.lang.Object message)

Logs a message with "fatal" status.

Parameters:

message - the message to log

error

public void error(java.lang.Object message)

Logs a message with "error" status.

Parameters:

message - the message to log

warning

public void warning(java.lang.Object message)

Logs a message with "warning" status.

Parameters:

message - the message to log

info

public void info(java.lang.Object message,
        java.lang.Throwable t)

Logs a message with "info" status.

Parameters:

message - the message to log

debug

public void debug(java.lang.Object message)

Logs a message with "debug" status.

Parameters:

message - the message to log

isFatalEnabled

public boolean isFatalEnabled()

Checks if the logger has been enabled to allow fatal messages.

Returns:

true if enabled, and false otherwise

isDebugEnabled

public boolean isDebugEnabled()

Checks if the logger has been enabled to allow debug messages.

Returns:

true if enabled, and false otherwise

isInfoEnabled

public boolean isInfoEnabled()

Checks if the logger has been enabled to allow info messages.

Returns:

true if enabled, and false otherwise

isWarnEnabled

public boolean isWarnEnabled()

Checks if the logger has been enabled to allow warning messages.

Returns:

true if enabled, and false otherwise

isErrorEnabled

public boolean isErrorEnabled()

Checks if the logger has been enabled to allow error messages.

Returns:

true if enabled, and false otherwise