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Java Source Code / Java Documentation » Development » SLF4J » org.apache.commons.logging 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.apache.commons.logging.Log

All known Subclasses:   org.apache.commons.logging.impl.NoOpLog,  org.apache.commons.logging.impl.SLF4JLog,  org.apache.commons.logging.impl.SLF4JLocationAwareLog,  org.apache.commons.logging.impl.SimpleLog,
Log
public interface Log (Code)

A simple logging interface abstracting logging APIs. In order to be instantiated successfully by LogFactory , classes that implement this interface must have a constructor that takes a single String parameter representing the "name" of this Log.

The six logging levels used by Log are (in order):

  1. trace (the least serious)
  2. debug
  3. info
  4. warn
  5. error
  6. fatal (the most serious)
The mapping of these log levels to the concepts used by the underlying logging system is implementation dependent. The implemention should ensure, though, that this ordering behaves as expected.

Performance is often a logging concern. By examining the appropriate property, a component can avoid expensive operations (producing information to be logged).

For example,

 if (log.isDebugEnabled()) {
 ... do something expensive ...
 log.debug(theResult);
 }
 

Configuration of the underlying logging system will generally be done external to the Logging APIs, through whatever mechanism is supported by that system.

Please note that this interface is identical to that found in JCL 1.0.4.


author:
   Scott Sanders
author:
   Rod Waldhoff
version:
   $Id: Log.java,v 1.19 2004/06/06 21:16:04 rdonkin Exp $




Method Summary
public  voiddebug(Object message)
    

Log a message with debug log level.

public  voiddebug(Object message, Throwable t)
    

Log an error with debug log level.

public  voiderror(Object message)
    

Log a message with error log level.

public  voiderror(Object message, Throwable t)
    

Log an error with error log level.

public  voidfatal(Object message)
    

Log a message with fatal log level.

public  voidfatal(Object message, Throwable t)
    

Log an error with fatal log level.

public  voidinfo(Object message)
    

Log a message with info log level.

public  voidinfo(Object message, Throwable t)
    

Log an error with info log level.

public  booleanisDebugEnabled()
    

Is debug logging currently enabled?

Call this method to prevent having to perform expensive operations (for example, String concatenation) when the log level is more than debug.

public  booleanisErrorEnabled()
    

Is error logging currently enabled?

Call this method to prevent having to perform expensive operations (for example, String concatenation) when the log level is more than error.

public  booleanisFatalEnabled()
    

Is fatal logging currently enabled?

Call this method to prevent having to perform expensive operations (for example, String concatenation) when the log level is more than fatal.

public  booleanisInfoEnabled()
    

Is info logging currently enabled?

Call this method to prevent having to perform expensive operations (for example, String concatenation) when the log level is more than info.

public  booleanisTraceEnabled()
    

Is trace logging currently enabled?

Call this method to prevent having to perform expensive operations (for example, String concatenation) when the log level is more than trace.

public  booleanisWarnEnabled()
    

Is warn logging currently enabled?

Call this method to prevent having to perform expensive operations (for example, String concatenation) when the log level is more than warn.

public  voidtrace(Object message)
    

Log a message with trace log level.

public  voidtrace(Object message, Throwable t)
    

Log an error with trace log level.

public  voidwarn(Object message)
    

Log a message with warn log level.

public  voidwarn(Object message, Throwable t)
    

Log an error with warn log level.




Method Detail
debug
public void debug(Object message)(Code)

Log a message with debug log level.


Parameters:
  message - log this message



debug
public void debug(Object message, Throwable t)(Code)

Log an error with debug log level.


Parameters:
  message - log this message
Parameters:
  t - log this cause



error
public void error(Object message)(Code)

Log a message with error log level.


Parameters:
  message - log this message



error
public void error(Object message, Throwable t)(Code)

Log an error with error log level.


Parameters:
  message - log this message
Parameters:
  t - log this cause



fatal
public void fatal(Object message)(Code)

Log a message with fatal log level.


Parameters:
  message - log this message



fatal
public void fatal(Object message, Throwable t)(Code)

Log an error with fatal log level.


Parameters:
  message - log this message
Parameters:
  t - log this cause



info
public void info(Object message)(Code)

Log a message with info log level.


Parameters:
  message - log this message



info
public void info(Object message, Throwable t)(Code)

Log an error with info log level.


Parameters:
  message - log this message
Parameters:
  t - log this cause



isDebugEnabled
public boolean isDebugEnabled()(Code)

Is debug logging currently enabled?

Call this method to prevent having to perform expensive operations (for example, String concatenation) when the log level is more than debug.




isErrorEnabled
public boolean isErrorEnabled()(Code)

Is error logging currently enabled?

Call this method to prevent having to perform expensive operations (for example, String concatenation) when the log level is more than error.




isFatalEnabled
public boolean isFatalEnabled()(Code)

Is fatal logging currently enabled?

Call this method to prevent having to perform expensive operations (for example, String concatenation) when the log level is more than fatal.




isInfoEnabled
public boolean isInfoEnabled()(Code)

Is info logging currently enabled?

Call this method to prevent having to perform expensive operations (for example, String concatenation) when the log level is more than info.




isTraceEnabled
public boolean isTraceEnabled()(Code)

Is trace logging currently enabled?

Call this method to prevent having to perform expensive operations (for example, String concatenation) when the log level is more than trace.




isWarnEnabled
public boolean isWarnEnabled()(Code)

Is warn logging currently enabled?

Call this method to prevent having to perform expensive operations (for example, String concatenation) when the log level is more than warn.




trace
public void trace(Object message)(Code)

Log a message with trace log level.


Parameters:
  message - log this message



trace
public void trace(Object message, Throwable t)(Code)

Log an error with trace log level.


Parameters:
  message - log this message
Parameters:
  t - log this cause



warn
public void warn(Object message)(Code)

Log a message with warn log level.


Parameters:
  message - log this message



warn
public void warn(Object message, Throwable t)(Code)

Log an error with warn log level.


Parameters:
  message - log this message
Parameters:
  t - log this cause



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