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):
- trace (the least serious)
- debug
- info
- warn
- error
- fatal (the most serious)
The mapping of these log levels to the concepts used by the underlying logging system is implementation dependent. The implementation 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.
- Author:
- Scott Sanders, Rod Waldhoff
- 
Method SummaryModifier and TypeMethodDescriptionvoidLog a message with debug log level.voidLog an error with debug log level.voidLog a message with error log level.voidLog an error with error log level.voidLog a message with fatal log level.voidLog an error with fatal log level.voidLog a message with info log level.voidLog an error with info log level.booleanIs debug logging currently enabled?booleanIs error logging currently enabled?booleanIs fatal logging currently enabled?booleanIs info logging currently enabled?booleanIs trace logging currently enabled?booleanIs warn logging currently enabled?voidLog a message with trace log level.voidLog an error with trace log level.voidLog a message with warn log level.voidLog an error with warn log level.
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Method Details- 
isDebugEnabledboolean isDebugEnabled()Is debug logging currently enabled? Call this method to prevent having to perform expensive operations (for example, Stringconcatenation) when the log level is more than debug.- Returns:
- trueif debug level logging is enabled, otherwise- false
 
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isErrorEnabledboolean isErrorEnabled()Is error logging currently enabled? Call this method to prevent having to perform expensive operations (for example, Stringconcatenation) when the log level is more than error.- Returns:
- trueif error level logging is enabled, otherwise- false
 
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isFatalEnabledboolean isFatalEnabled()Is fatal logging currently enabled? Call this method to prevent having to perform expensive operations (for example, Stringconcatenation) when the log level is more than fatal.- Returns:
- trueif fatal level logging is enabled, otherwise- false
 
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isInfoEnabledboolean isInfoEnabled()Is info logging currently enabled? Call this method to prevent having to perform expensive operations (for example, Stringconcatenation) when the log level is more than info.- Returns:
- trueif info level logging is enabled, otherwise- false
 
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isTraceEnabledboolean isTraceEnabled()Is trace logging currently enabled? Call this method to prevent having to perform expensive operations (for example, Stringconcatenation) when the log level is more than trace.- Returns:
- trueif trace level logging is enabled, otherwise- false
 
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isWarnEnabledboolean isWarnEnabled()Is warn logging currently enabled? Call this method to prevent having to perform expensive operations (for example, Stringconcatenation) when the log level is more than warn.- Returns:
- trueif warn level logging is enabled, otherwise- false
 
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traceLog a message with trace log level. - Parameters:
- message- log this message
 
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traceLog an error with trace log level. - Parameters:
- message- log this message
- t- log this cause
 
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debugLog a message with debug log level. - Parameters:
- message- log this message
 
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debugLog an error with debug log level. - Parameters:
- message- log this message
- t- log this cause
 
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infoLog a message with info log level. - Parameters:
- message- log this message
 
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infoLog an error with info log level. - Parameters:
- message- log this message
- t- log this cause
 
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warnLog a message with warn log level. - Parameters:
- message- log this message
 
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warnLog an error with warn log level. - Parameters:
- message- log this message
- t- log this cause
 
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errorLog a message with error log level. - Parameters:
- message- log this message
 
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errorLog an error with error log level. - Parameters:
- message- log this message
- t- log this cause
 
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fatalLog a message with fatal log level. - Parameters:
- message- log this message
 
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fatalLog an error with fatal log level. - Parameters:
- message- log this message
- t- log this cause
 
 
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