CODEWITHSUNDEEP
javalog4j
Romain Linsolas
Romain Linsolas

Reputation: 81667

How to mutualize appenders properties in log4j.properties file?

I have a log4j.properties file where I have to define ~ 12 different appenders. In fact, all of these appenders are similar, except for the name and the File attribute. I have something like that:

log4j.logger.FOO=DEBUG, fileFOO
log4j.appender.fileFOO=org.apache.log4j.RollingFileAppender
log4j.appender.fileFOO.File=/some/path/file-FOO.log
log4j.appender.fileFOO.MaxFileSize=5MB
log4j.appender.fileFOO.MaxBackupIndex=20
log4j.appender.fileFOO.layout=org.apache.log4j.PatternLayout
log4j.appender.fileFOO.layout.ConversionPattern=%d %-5p ~ %m%n

log4j.logger.BAR=DEBUG, fileBAR
log4j.appender.fileBAR=org.apache.log4j.RollingFileAppender
log4j.appender.fileBAR.File=/some/path/file-BAR.log
log4j.appender.fileBAR.MaxFileSize=5MB
log4j.appender.fileBAR.MaxBackupIndex=20
log4j.appender.fileBAR.layout=org.apache.log4j.PatternLayout
log4j.appender.fileBAR.layout.ConversionPattern=%d %-5p ~ %m%n

As you can see, all lines are identical except log4j.logger.X and log4j.appender.fileX.File

Is there a way to define default values for others attributes (MaxFileSize, MaxBackupIndex, layout, etc.) of the appenders, something like an "inheritance" of appender?

Thanks

Upvotes: 2

Views: 88

Answers (1)

Milan Baran
Milan Baran

Reputation: 4232

Try to implement your custom default Appender and then use it instead RollingFileAppender

log4j.logger.FOO=DEBUG, fileFOO
log4j.appender.fileFOO=me.project.MyRollingFileAppender
log4j.appender.fileFOO.File=/some/path/file-FOO.log

public class MyRollingFileAppender extends RollingFileAppender {

  public MyRollingFileAppender() {
    super();
    init();
  }

  public MyRollingFileAppender(Layout layout, String filename) throws IOException {
    super(layout, filename);
    init();
  }

  public MyRollingFileAppender(Layout layout, String filename, boolean append)
      throws IOException {
    super(layout, filename, append);
    init();
  }

  private void init() {
    this.setMaxFileSize("5MB");
    this.setMaxBackupIndex(20);
    this.setLayout( new PatternLayout("%d %-5p ~ %m%n"));
  }
}

Upvotes: 1

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