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Setting file appender log path on runtime

/ Published in: Java
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  1. import com.alphacsp.common.log.Log;
  2. import org.apache.log4j.Category;
  3. import org.apache.log4j.FileAppender;
  4. import org.apache.log4j.AppenderSkeleton;
  5.  
  6. import java.lang.reflect.Field;
  7. import java.util.Enumeration;
  8.  
  9. public class FileAppenderManipulation {
  10.  
  11.     public void setAppenderFilenameForLogger(Log log, String filename, String appenderName) {
  12.         try {
  13.             Category category = getCategory(log);
  14.             final FileAppender fileAppender = (FileAppender) locateAppender(category, appenderName);
  15.             fileAppender.setFile(filename);
  16.             fileAppender.activateOptions();
  17.         } catch (NoSuchFieldException e) {
  18.             e.printStackTrace();
  19.         } catch (IllegalAccessException e) {
  20.             e.printStackTrace();
  21.         }
  22.  
  23.     }
  24.  
  25.     private AppenderSkeleton locateAppender(Category category, String name) {
  26.         do {
  27.             final Enumeration appenders = category.getAllAppenders();
  28.             while (appenders.hasMoreElements()) {
  29.                 AppenderSkeleton appenderSkeleton = (AppenderSkeleton) appenders.nextElement();
  30.                 if (appenderSkeleton.getName().equals(name)) {
  31.                     return appenderSkeleton;
  32.                 }
  33.             }
  34.         } while ((category = category.getParent()) != null);
  35.         throw new RuntimeException("The requested appender dosn't exists!");
  36.     }
  37.  
  38.     private Category getCategory(Log log) throws NoSuchFieldException, IllegalAccessException {
  39.         Field field = log.getClass().getDeclaredField("category");
  40.         field.setAccessible(true);
  41.         Category category = (Category) field.get(log);
  42.         return category;
  43.     }
  44. }

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