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While checking the javadoc for PatternLayout, I noticed that it recommends using EnhancedPatternLayout instead. However, it seems to do pretty much the same thing.
What are the main differences, especially the ones I need to be aware of?
I'm also wondering why they made a separate class rather than enhancing the original class. Any syntax differences?
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PatternLayout to format your logging information. The PatternLayout class extends the abstract org. apache. log4j. Layout class and overrides the format() method to structure the logging information according to a supplied pattern.
1.2 Log4j Conversion Pattern The percentage sign ( % ) is a prefix for any conversion characters. -5p is the format modifier for the conversion character p (i.e. priority). This justifies the priority name with a minimum of 5 characters.
To recall, a conversion pattern specifies how log messages are formatted, using a combination of literals, conversion characters and format modifiers. Consider the following pattern: log4j.appender.ConsoleAppender.layout.ConversionPattern=[%-5p] %d %c - %m%n.
The format characters used in log4j are, L- it is used to output the line number from where the logging request was processed or issued. m- It is used to output the application supplied message related to the logging event. p- It is used to output the priority of the logging event.
The PatternLayout class extends the abstract org.apache.log4j.Layout class and overrides the format () method to structure the logging information according to a supplied pattern. PatternLayout is also a simple Layout object that provides the following- Bean Property which can be set using the configuration file:
The PatternLayout class extends the abstract org.apache.log4j.Layout class and overrides the format () method to structure the logging information according to a supplied pattern. PatternLayout is also a simple Layout object that provides the following- Bean Property which can be set using the configuration file: Sets the conversion pattern.
The placement of pattern on the fabric, in an economical manner, that is without wasting fabric is known as pattern layout. The placement of pattern on the fabric, in an economical manner, that is without wasting fabric is known as pattern layout. All the patterns should be arranged prop-erly following grain of the fabric.
Specifying something like GMT-5 will simply adjust the GMT time zone by the specified amount of hours. Also if you whant to dinamicaly obtein the default time zone, you can extend EnhancedPatternLayout and overwrite the method "setConversionPattern" like this:
Check the documentation, everything is explained. EnhancedPatternLayout is an enhanced version of PatternLayout. It should be used in preference to PatternLayout (except for compatibility reason with PatternLayout).
PatternLayout contains some issues which are not present in EnhancedPatternLayout especially with synchronisation.
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The main difference between PatternLayout and EnhancedPatternLayout is in the format() method. PatternLayout relies on a member field named sbuf which it modifies whereas EnhancedPatternLayout uses a private instance of the StringBuffer. This means that PatternLayout.format() calls are susceptible to data races during concurrent calls while concurrent EnhancedPatternLayout.format() calls are not.
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