SimpleLogger

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

All Implemented Interfaces:

Serializable, Logger
```
public class SimpleLogger
extends MarkerIgnoringBase
```
Simple implementation of Logger that sends all enabled log messages, for all defined loggers, to the console (System.err). The following system properties are supported to configure the behavior of this logger:
- org.slf4j.simpleLogger.logFile - The output target which can be the path to a file, or the special values "System.out" and "System.err". Default is "System.err".
- org.slf4j.simpleLogger.cacheOutputStream - If the output target is set to "System.out" or "System.err" (see preceding entry), by default, logs will be output to the latest value referenced by System.out/err variables. By setting this parameter to true, the output stream will be cached, i.e. assigned once at initialization time and re-used independently of the current value referenced by System.out/err.
- org.slf4j.simpleLogger.defaultLogLevel - Default log level for all instances of SimpleLogger. Must be one of ("trace", "debug", "info", "warn", "error" or "off"). If not specified, defaults to "info".
- org.slf4j.simpleLogger.log.a.b.c - Logging detail level for a SimpleLogger instance named "a.b.c". Right-side value must be one of "trace", "debug", "info", "warn", "error" or "off". When a SimpleLogger named "a.b.c" is initialized, its level is assigned from this property. If unspecified, the level of nearest parent logger will be used, and if none is set, then the value specified by org.slf4j.simpleLogger.defaultLogLevel will be used.
- org.slf4j.simpleLogger.showDateTime - Set to true if you want the current date and time to be included in output messages. Default is false
- org.slf4j.simpleLogger.dateTimeFormat - The date and time format to be used in the output messages. The pattern describing the date and time format is defined by SimpleDateFormat. If the format is not specified or is invalid, the number of milliseconds since start up will be output.
- org.slf4j.simpleLogger.showThreadName -Set to true if you want to output the current thread name. Defaults to true.
- org.slf4j.simpleLogger.showLogName - Set to true if you want the Logger instance name to be included in output messages. Defaults to true.
- org.slf4j.simpleLogger.showShortLogName - Set to true if you want the last component of the name to be included in output messages. Defaults to false.
- org.slf4j.simpleLogger.levelInBrackets - Should the level string be output in brackets? Defaults to false.
- org.slf4j.simpleLogger.warnLevelString - The string value output for the warn level. Defaults to WARN.
In addition to looking for system properties with the names specified above, this implementation also checks for a class loader resource named "simplelogger.properties", and includes any matching definitions from this resource (if it exists).

With no configuration, the default 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.
 
```
This implementation is heavily inspired by Apache Commons Logging's SimpleLog.
Author:

Ceki Gülcü, Scott Sanders, Rod Waldhoff, Robert Burrell Donkin, Cédrik LIME

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`CACHE_OUTPUT_STREAM_STRING_KEY`
`protected int`	`currentLogLevel` The current log level
`static String`	`DATE_TIME_FORMAT_KEY`
`static String`	`DEFAULT_LOG_LEVEL_KEY`
`static String`	`LEVEL_IN_BRACKETS_KEY`
`static String`	`LOG_FILE_KEY`
`static String`	`LOG_KEY_PREFIX`
`protected static int`	`LOG_LEVEL_DEBUG`
`protected static int`	`LOG_LEVEL_ERROR`
`protected static int`	`LOG_LEVEL_INFO`
`protected static int`	`LOG_LEVEL_OFF`
`protected static int`	`LOG_LEVEL_TRACE`
`protected static int`	`LOG_LEVEL_WARN`
`protected String`	`name`
`static String`	`SHOW_DATE_TIME_KEY`
`static String`	`SHOW_LOG_NAME_KEY`
`static String`	`SHOW_SHORT_LOG_NAME_KEY`
`static String`	`SHOW_THREAD_NAME_KEY`
`static String`	`SYSTEM_PREFIX` All system properties used by `SimpleLogger` start with this prefix
`static String`	`WARN_LEVEL_STRING_KEY`

Fields inherited from interface org.slf4j.Logger
ROOT_LOGGER_NAME

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`debug(String msg)` A simple implementation which logs messages of level DEBUG according to the format outlined above.
`void`	`debug(String format, Object... argArray)` Perform double parameter substitution before logging the message of level DEBUG according to the format outlined above.
`void`	`debug(String format, Object param1)` Perform single parameter substitution before logging the message of level DEBUG according to the format outlined above.
`void`	`debug(String format, Object param1, Object param2)` Perform double parameter substitution before logging the message of level DEBUG according to the format outlined above.
`void`	`debug(String msg, Throwable t)` Log a message of level DEBUG, including an exception.
`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... argArray)` Perform double parameter substitution before logging the message 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 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 logs messages 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 arg)` Perform single 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()` Are `debug` messages currently enabled?
`boolean`	`isErrorEnabled()` Are `error` messages currently enabled?
`boolean`	`isInfoEnabled()` Are `info` messages currently enabled?
`protected boolean`	`isLevelEnabled(int logLevel)` Is the given log level currently enabled?
`boolean`	`isTraceEnabled()` Are `trace` messages currently enabled?
`boolean`	`isWarnEnabled()` Are `warn` messages currently enabled?
`void`	`log(LoggingEvent event)`
`protected Object`	`readResolve()` Replace this instance with a homonymous (same name) logger returned by LoggerFactory.
`protected String`	`renderLevel(int level)`
`void`	`trace(String msg)` A simple implementation which logs messages of level TRACE according to the format outlined above.
`void`	`trace(String format, Object... argArray)` Perform double parameter substitution before logging the message of level TRACE according to the format outlined above.
`void`	`trace(String format, Object param1)` Perform single parameter substitution before logging the message of level TRACE according to the format outlined above.
`void`	`trace(String format, Object param1, Object param2)` Perform double parameter substitution before logging the message of level TRACE according to the format outlined above.
`void`	`trace(String msg, Throwable t)` Log a message of level TRACE, including an exception.
`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... argArray)` Perform double parameter substitution before logging the message 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 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.
`protected void`	`writeThrowable(Throwable t, PrintStream targetStream)`

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, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.slf4j.Logger
getName

- Field Detail
  - CACHE_OUTPUT_STREAM_STRING_KEY
```
public static final String CACHE_OUTPUT_STREAM_STRING_KEY
```
    See Also:
    
    Constant Field Values
  - currentLogLevel
```
protected int currentLogLevel
```
    The current log level
  - DATE_TIME_FORMAT_KEY
```
public static final String DATE_TIME_FORMAT_KEY
```
    See Also:
    
    Constant Field Values
  - DEFAULT_LOG_LEVEL_KEY
```
public static final String DEFAULT_LOG_LEVEL_KEY
```
    See Also:
    
    Constant Field Values
  - LEVEL_IN_BRACKETS_KEY
```
public static final String LEVEL_IN_BRACKETS_KEY
```
    See Also:
    
    Constant Field Values
  - LOG_FILE_KEY
```
public static final String LOG_FILE_KEY
```
    See Also:
    
    Constant Field Values
  - LOG_KEY_PREFIX
```
public static final String LOG_KEY_PREFIX
```
    See Also:
    
    Constant Field Values
  - LOG_LEVEL_DEBUG
```
protected static final int LOG_LEVEL_DEBUG
```
    See Also:
    
    Constant Field Values
  - LOG_LEVEL_ERROR
```
protected static final int LOG_LEVEL_ERROR
```
    See Also:
    
    Constant Field Values
  - LOG_LEVEL_INFO
```
protected static final int LOG_LEVEL_INFO
```
    See Also:
    
    Constant Field Values
  - LOG_LEVEL_OFF
```
protected static final int LOG_LEVEL_OFF
```
    See Also:
    
    Constant Field Values
  - LOG_LEVEL_TRACE
```
protected static final int LOG_LEVEL_TRACE
```
    See Also:
    
    Constant Field Values
  - LOG_LEVEL_WARN
```
protected static final int LOG_LEVEL_WARN
```
    See Also:
    
    Constant Field Values
  - SHOW_DATE_TIME_KEY
```
public static final String SHOW_DATE_TIME_KEY
```
    See Also:
    
    Constant Field Values
  - SHOW_LOG_NAME_KEY
```
public static final String SHOW_LOG_NAME_KEY
```
    See Also:
    
    Constant Field Values
  - SHOW_SHORT_LOG_NAME_KEY
```
public static final String SHOW_SHORT_LOG_NAME_KEY
```
    See Also:
    
    Constant Field Values
  - SHOW_THREAD_NAME_KEY
```
public static final String SHOW_THREAD_NAME_KEY
```
    See Also:
    
    Constant Field Values
  - SYSTEM_PREFIX
```
public static final String SYSTEM_PREFIX
```
    All system properties used by SimpleLogger start with this prefix
    
    See Also:
    
    Constant Field Values
  - WARN_LEVEL_STRING_KEY
```
public static final String WARN_LEVEL_STRING_KEY
```
    See Also:
    
    Constant Field Values
  - name
```
protected String name
```
- Method Detail
  - debug
```
public void debug(String msg)
```
    A simple implementation which logs messages of level DEBUG according to the format outlined above.
    
    Parameters:
    
    msg - the message string to be logged
  - debug
```
public void debug(String format,
                  Object... argArray)
```
    Perform double parameter substitution before logging the message of level DEBUG according to the format outlined above.
    
    Parameters:
    
    format - the format string
    
    argArray - a list of 3 or more arguments
  - debug
```
public void debug(String format,
                  Object param1)
```
    Perform single parameter substitution before logging the message of level DEBUG according to the format outlined above.
    
    Parameters:
    
    format - the format string
    
    param1 - the argument
  - debug
```
public void debug(String format,
                  Object param1,
                  Object param2)
```
    Perform double parameter substitution before logging the message of level DEBUG according to the format outlined above.
    
    Parameters:
    
    format - the format string
    
    param1 - the first argument
    
    param2 - the second argument
  - debug
```
public void debug(String msg,
                  Throwable t)
```
    Log a message of level DEBUG, including an exception.
    
    Parameters:
    
    msg - the message accompanying the exception
    
    t - the exception (throwable) to log
  - 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... argArray)
```
    Perform double parameter substitution before logging the message of level ERROR according to the format outlined above.
    
    Parameters:
    
    format - the format string
    
    argArray - a list of 3 or more arguments
  - 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 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
  - info
```
public void info(String msg)
```
    A simple implementation which 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... argArray)
```
    Perform double parameter substitution before logging the message of level INFO according to the format outlined above.
    
    Parameters:
    
    format - the format string
    
    argArray - a list of 3 or more arguments
  - 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 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
  - isDebugEnabled
```
public boolean isDebugEnabled()
```
    Are debug messages currently enabled?
    
    Returns:
    
    True if this Logger is enabled for the DEBUG level, false otherwise.
  - isErrorEnabled
```
public boolean isErrorEnabled()
```
    Are error messages currently enabled?
    
    Returns:
    
    True if this Logger is enabled for the ERROR level, false otherwise.
  - isInfoEnabled
```
public boolean isInfoEnabled()
```
    Are info messages currently enabled?
    
    Returns:
    
    True if this Logger is enabled for the INFO level, false otherwise.
  - isLevelEnabled
```
protected boolean isLevelEnabled(int logLevel)
```
    Is the given log level currently enabled?
    
    Parameters:
    
    logLevel - is this level enabled?
  - isTraceEnabled
```
public boolean isTraceEnabled()
```
    Are trace messages currently enabled?
    
    Returns:
    
    True if this Logger is enabled for the TRACE level, false otherwise.
  - isWarnEnabled
```
public boolean isWarnEnabled()
```
    Are warn messages currently enabled?
    
    Returns:
    
    True if this Logger is enabled for the WARN level, false otherwise.
  - log
```
public void log(LoggingEvent event)
```
  - renderLevel
```
protected String renderLevel(int level)
```
  - trace
```
public void trace(String msg)
```
    A simple implementation which logs messages of level TRACE according to the format outlined above.
    
    Parameters:
    
    msg - the message string to be logged
  - trace
```
public void trace(String format,
                  Object... argArray)
```
    Perform double parameter substitution before logging the message of level TRACE according to the format outlined above.
    
    Parameters:
    
    format - the format string
    
    argArray - a list of 3 or more arguments
  - trace
```
public void trace(String format,
                  Object param1)
```
    Perform single parameter substitution before logging the message of level TRACE according to the format outlined above.
    
    Parameters:
    
    format - the format string
    
    param1 - the argument
  - trace
```
public void trace(String format,
                  Object param1,
                  Object param2)
```
    Perform double parameter substitution before logging the message of level TRACE according to the format outlined above.
    
    Parameters:
    
    format - the format string
    
    param1 - the first argument
    
    param2 - the second argument
  - trace
```
public void trace(String msg,
                  Throwable t)
```
    Log a message of level TRACE, including an exception.
    
    Parameters:
    
    msg - the message accompanying the exception
    
    t - the exception (throwable) to log
  - 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... argArray)
```
    Perform double parameter substitution before logging the message of level WARN according to the format outlined above.
    
    Parameters:
    
    format - the format string
    
    argArray - a list of 3 or more arguments
  - 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 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
  - writeThrowable
```
protected void writeThrowable(Throwable t,
                              PrintStream targetStream)
```
  - getName
```
public String getName()
```
    Description copied from interface: Logger
    
    Return the name of this Logger instance.
    
    Specified by:
    
    getName in interface Logger
    
    Returns:
    
    name of this logger instance
  - readResolve
```
protected Object readResolve()
                      throws java.io.ObjectStreamException
```
    Replace this instance with a homonymous (same name) logger returned by LoggerFactory. Note that this method is only called during deserialization.
    This approach will work well if the desired ILoggerFactory is the one references by LoggerFactory. However, if the user manages its logger hierarchy through a different (non-static) mechanism, e.g. dependency injection, then this approach would be mostly counterproductive.
    
    Returns:
    
    logger with same name as returned by LoggerFactory
    
    Throws:
    
    java.io.ObjectStreamException

Class SimpleLogger

Field Summary

Fields inherited from interface org.slf4j.Logger

Method Summary

Methods inherited from class org.slf4j.helpers.MarkerIgnoringBase

Methods inherited from class java.lang.Object

Methods inherited from interface org.slf4j.Logger

Field Detail

CACHE_OUTPUT_STREAM_STRING_KEY

currentLogLevel

DATE_TIME_FORMAT_KEY

DEFAULT_LOG_LEVEL_KEY

LEVEL_IN_BRACKETS_KEY

LOG_FILE_KEY

LOG_KEY_PREFIX

LOG_LEVEL_DEBUG

LOG_LEVEL_ERROR

LOG_LEVEL_INFO

LOG_LEVEL_OFF

LOG_LEVEL_TRACE

LOG_LEVEL_WARN

SHOW_DATE_TIME_KEY

SHOW_LOG_NAME_KEY

SHOW_SHORT_LOG_NAME_KEY

SHOW_THREAD_NAME_KEY

SYSTEM_PREFIX

WARN_LEVEL_STRING_KEY

name

Method Detail

debug

debug

debug

debug

debug

error

error

error

error

error

info

info

info

info

info

isDebugEnabled

isErrorEnabled

isInfoEnabled

isLevelEnabled

isTraceEnabled

isWarnEnabled

log

renderLevel

trace

trace

trace

trace

trace

warn

warn

warn

warn

warn

writeThrowable

getName

readResolve