org.slf4j.impl
Class SimpleLogger

java.lang.Object
  org.slf4j.helpers.MarkerIgnoringBase
      org.slf4j.impl.SimpleLogger

All Implemented Interfaces:

Logger

public class SimpleLogger
extends MarkerIgnoringBase

A simple (and direct) implementation that logs messages of level INFO or higher on the console (System.err).

The output includes the relative time in milliseconds, thread name, the level, logger name, and the message followed by the line separator for the host. In log4j terms it amounts to the "%r [%t] %level %logger - %m%n" pattern.

Sample output follows.

176 [main] INFO examples.Sort - Populating an array of 2 elements in reverse order.
225 [main] INFO examples.SortAlgo - Entered the sort method.
304 [main] INFO examples.SortAlgo - Dump of integer array:
317 [main] INFO examples.SortAlgo - Element [0] = 0
331 [main] INFO examples.SortAlgo - Element [1] = 1
343 [main] INFO examples.Sort - The next log statement should be an error message.
346 [main] ERROR examples.SortAlgo - Tried to dump an uninitialized array.
        at org.log4j.examples.SortAlgo.dump(SortAlgo.java:58)
        at org.log4j.examples.Sort.main(Sort.java:64)
467 [main] INFO  examples.Sort - Exiting main method.

Author:

Ceki Gülcü

Field Summary

static String

LINE_SEPARATOR

Fields inherited from interface org.slf4j.Logger

ROOT_LOGGER_NAME

Method Summary

void	debug(String msg) A NOP implementation, as this logger is permanently disabled for the DEBUG level.
void	debug(String format, Object param1) A NOP implementation, as this logger is permanently disabled for the DEBUG level.
void	debug(String format, Object[] argArray) Log a message at the DEBUG level according to the specified format and arguments.
void	debug(String format, Object param1, Object param2) A NOP implementation, as this logger is permanently disabled for the DEBUG level.
void	debug(String msg, Throwable t) A NOP implementation, as this logger is permanently disabled for the DEBUG level.
void	error(String msg) A simple implementation which always logs messages of level ERROR according to the format outlined above.
void	error(String format, Object arg) Perform single parameter substitution before logging the message of level ERROR according to the format outlined above.
void	error(String format, Object[] argArray) Perform double parameter substitution before logging the message of level ERROR according to the format outlined above.
void	error(String format, Object arg1, Object arg2) Perform double parameter substitution before logging the message of level ERROR according to the format outlined above.
void	error(String msg, Throwable t) Log a message of level ERROR, including an exception.
String	getName() Return the name of this Logger instance.
void	info(String msg) A simple implementation which always logs messages of level INFO according to the format outlined above.
void	info(String format, Object arg) Perform single parameter substitution before logging the message of level INFO according to the format outlined above.
void	info(String format, Object[] argArray) Perform double parameter substitution before logging the message of level INFO according to the format outlined above.
void	info(String format, Object arg1, Object arg2) Perform double parameter substitution before logging the message of level INFO according to the format outlined above.
void	info(String msg, Throwable t) Log a message of level INFO, including an exception.
boolean	isDebugEnabled() Always returns false.
boolean	isErrorEnabled() Always returns true.
boolean	isInfoEnabled() Always returns true.
boolean	isTraceEnabled() Always returns false.
boolean	isWarnEnabled() Always returns true.
void	trace(String msg) A NOP implementation, as this logger is permanently disabled for the TRACE level.
void	trace(String format, Object param1) A NOP implementation, as this logger is permanently disabled for the TRACE level.
void	trace(String format, Object[] argArray) Log a message at the TRACE level according to the specified format and arguments.
void	trace(String format, Object param1, Object param2) A NOP implementation, as this logger is permanently disabled for the TRACE level.
void	trace(String msg, Throwable t) A NOP implementation, as this logger is permanently disabled for the TRACE level.
void	warn(String msg) A simple implementation which always logs messages of level WARN according to the format outlined above.
void	warn(String format, Object arg) Perform single parameter substitution before logging the message of level WARN according to the format outlined above.
void	warn(String format, Object[] argArray) Perform double parameter substitution before logging the message of level WARN according to the format outlined above.
void	warn(String format, Object arg1, Object arg2) Perform double parameter substitution before logging the message of level WARN according to the format outlined above.
void	warn(String msg, Throwable t) Log a message of level WARN, including an exception.

Methods inherited from class org.slf4j.helpers.MarkerIgnoringBase

debug, debug, debug, debug, debug, error, error, error, error, error, info, info, info, info, info, isDebugEnabled, isErrorEnabled, isInfoEnabled, isTraceEnabled, isWarnEnabled, toString, trace, trace, trace, trace, trace, warn, warn, warn, warn, warn

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

LINE_SEPARATOR

public static final String LINE_SEPARATOR

Method Detail

getName

public String getName()

Description copied from interface: Logger

Return the name of this Logger instance.

isTraceEnabled

public boolean isTraceEnabled()

Always returns false.

Returns:

always false

trace

public void trace(String msg)

A NOP implementation, as this logger is permanently disabled for the TRACE level.

Parameters:

msg - the message string to be logged

trace

public void trace(String format,
                  Object param1)

A NOP implementation, as this logger is permanently disabled for the TRACE level.

Parameters:

format - the format string

param1 - the argument

trace

public void trace(String format,
                  Object param1,
                  Object param2)

A NOP implementation, as this logger is permanently disabled for the TRACE level.

Parameters:

format - the format string

param1 - the first argument

param2 - the second argument

trace

public void trace(String format,
                  Object[] argArray)

Description copied from interface: Logger

Log a message at the TRACE level according to the specified format and arguments.

This form avoids superfluous object creation when the logger is disabled for the TRACE level.

Parameters:

format - the format string

argArray - an array of arguments

trace

public void trace(String msg,
                  Throwable t)

A NOP implementation, as this logger is permanently disabled for the TRACE level.

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log

isDebugEnabled

public boolean isDebugEnabled()

Always returns false.

Returns:

always false

debug

public void debug(String msg)

A NOP implementation, as this logger is permanently disabled for the DEBUG level.

Parameters:

msg - the message string to be logged

debug

public void debug(String format,
                  Object param1)

A NOP implementation, as this logger is permanently disabled for the DEBUG level.

Parameters:

format - the format string

param1 - the argument

debug

public void debug(String format,
                  Object param1,
                  Object param2)

A NOP implementation, as this logger is permanently disabled for the DEBUG level.

Parameters:

format - the format string

param1 - the first argument

param2 - the second argument

debug

public void debug(String format,
                  Object[] argArray)

Description copied from interface: Logger

Log a message at the DEBUG level according to the specified format and arguments.

This form avoids superfluous object creation when the logger is disabled for the DEBUG level.

Parameters:

format - the format string

argArray - an array of arguments

debug

public void debug(String msg,
                  Throwable t)

A NOP implementation, as this logger is permanently disabled for the DEBUG level.

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log

isInfoEnabled

public boolean isInfoEnabled()

Always returns true.

Returns:

True if this Logger is enabled for the INFO level, false otherwise.

info

public void info(String msg)

A simple implementation which always logs messages of level INFO according to the format outlined above.

Parameters:

msg - the message string to be logged

info

public void info(String format,
                 Object arg)

Perform single parameter substitution before logging the message of level INFO according to the format outlined above.

Parameters:

format - the format string

arg - the argument

info

public void info(String format,
                 Object arg1,
                 Object arg2)

Perform double parameter substitution before logging the message of level INFO according to the format outlined above.

Parameters:

format - the format string

arg1 - the first argument

arg2 - the second argument

info

public void info(String format,
                 Object[] argArray)

Perform double parameter substitution before logging the message of level INFO according to the format outlined above.

Parameters:

format - the format string

argArray - an array of arguments

info

public void info(String msg,
                 Throwable t)

Log a message of level INFO, including an exception.

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log

isWarnEnabled

public boolean isWarnEnabled()

Always returns true.

Returns:

True if this Logger is enabled for the WARN level, false otherwise.

warn

public void warn(String msg)

A simple implementation which always logs messages of level WARN according to the format outlined above.

Parameters:

msg - the message string to be logged

warn

public void warn(String format,
                 Object arg)

Perform single parameter substitution before logging the message of level WARN according to the format outlined above.

Parameters:

format - the format string

arg - the argument

warn

public void warn(String format,
                 Object arg1,
                 Object arg2)

Perform double parameter substitution before logging the message of level WARN according to the format outlined above.

Parameters:

format - the format string

arg1 - the first argument

arg2 - the second argument

warn

public void warn(String format,
                 Object[] argArray)

Perform double parameter substitution before logging the message of level WARN according to the format outlined above.

Parameters:

format - the format string

argArray - an array of arguments

warn

public void warn(String msg,
                 Throwable t)

Log a message of level WARN, including an exception.

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log

isErrorEnabled

public boolean isErrorEnabled()

Always returns true.

Returns:

True if this Logger is enabled for the ERROR level, false otherwise.

error

public void error(String msg)

A simple implementation which always logs messages of level ERROR according to the format outlined above.

Parameters:

msg - the message string to be logged

error

public void error(String format,
                  Object arg)

Perform single parameter substitution before logging the message of level ERROR according to the format outlined above.

Parameters:

format - the format string

arg - the argument

error

public void error(String format,
                  Object arg1,
                  Object arg2)

Perform double parameter substitution before logging the message of level ERROR according to the format outlined above.

Parameters:

format - the format string

arg1 - the first argument

arg2 - the second argument

error

public void error(String format,
                  Object[] argArray)

Perform double parameter substitution before logging the message of level ERROR according to the format outlined above.

Parameters:

format - the format string

argArray - an array of arguments

error

public void error(String msg,
                  Throwable t)

Log a message of level ERROR, including an exception.

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log