org.apache.juli.logging
public interface Log
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):
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.
Version: $Id: Log.java 467222 2006-10-24 03:17:11Z markt $
Method Summary | |
---|---|
void | debug(Object message) Log a message with debug log level. |
void | debug(Object message, Throwable t) Log an error with debug log level. |
void | error(Object message) Log a message with error log level. |
void | error(Object message, Throwable t) Log an error with error log level. |
void | fatal(Object message) Log a message with fatal log level. |
void | fatal(Object message, Throwable t) Log an error with fatal log level. |
void | info(Object message) Log a message with info log level. |
void | info(Object message, Throwable t) Log an error with info log level. |
boolean | isDebugEnabled() Is debug logging currently enabled? |
boolean | isErrorEnabled() Is error logging currently enabled? |
boolean | isFatalEnabled() Is fatal logging currently enabled? |
boolean | isInfoEnabled() Is info logging currently enabled? |
boolean | isTraceEnabled() Is trace logging currently enabled? |
boolean | isWarnEnabled() Is warn logging currently enabled? |
void | trace(Object message) Log a message with trace log level. |
void | trace(Object message, Throwable t) Log an error with trace log level. |
void | warn(Object message) Log a message with warn log level. |
void | warn(Object message, Throwable t) Log an error with warn log level. |
Log a message with debug log level.
Parameters: message log this message
Log an error with debug log level.
Parameters: message log this message t log this cause
Log a message with error log level.
Parameters: message log this message
Log an error with error log level.
Parameters: message log this message t log this cause
Log a message with fatal log level.
Parameters: message log this message
Log an error with fatal log level.
Parameters: message log this message t log this cause
Log a message with info log level.
Parameters: message log this message
Log an error with info log level.
Parameters: message log this message t log this cause
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.
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.
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.
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.
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.
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.
Log a message with trace log level.
Parameters: message log this message
Log an error with trace log level.
Parameters: message log this message t log this cause
Log a message with warn log level.
Parameters: message log this message
Log an error with warn log level.
Parameters: message log this message t log this cause