org.apache.log4j.spi.ErrorHandler#setAppender ( )源码实例Demo

/**
 * Used internally to parse an {@link ErrorHandler} element.
 */
private void parseErrorHandler(Element element, Appender appender) {
    ErrorHandler eh = (ErrorHandler) OptionConverter.instantiateByClassName(
            subst(element.getAttribute(CLASS_ATTR)),
            ErrorHandler.class,
            null);

    if (eh != null) {
        eh.setAppender(appender);

        PropertySetter propSetter = new PropertySetter(eh);
        forEachElement(element.getChildNodes(), (currentElement) -> {
            String tagName = currentElement.getTagName();
            if (tagName.equals(PARAM_TAG)) {
                setParameter(currentElement, propSetter);
            }
        });
        propSetter.activate();
        appender.setErrorHandler(eh);
    }
}
 

/**
 * Used internally to parse an {@link ErrorHandler} element.
 */
private void parseErrorHandler(Element element, Appender appender) {
    ErrorHandler eh = (ErrorHandler) OptionConverter.instantiateByClassName(
            subst(element.getAttribute(CLASS_ATTR)),
            ErrorHandler.class,
            null);

    if (eh != null) {
        eh.setAppender(appender);

        PropertySetter propSetter = new PropertySetter(eh);
        forEachElement(element.getChildNodes(), (currentElement) -> {
            String tagName = currentElement.getTagName();
            if (tagName.equals(PARAM_TAG)) {
                setParameter(currentElement, propSetter);
            }
        });
        propSetter.activate();
        appender.setErrorHandler(eh);
    }
}
 

/**
 * Constructor
 */
public FallbackAppender() {
    ErrorHandler fb = new FallbackErrorHandler();
    this.setErrorHandler(fb);
    fb.setAppender(this);
    Appender rootAppen = Logger.getRootLogger().getAppender("RootAppender");

    if (rootAppen != null) {
        fb.setBackupAppender(rootAppen);
    }

    Logger logger = Logger.getLogger(LoggingInvocationProcessor.class);
    fb.setLogger(logger);
}
 

/**
 * Constructor
 */
public FailbackAppender() {
    ErrorHandler fb = new FallbackErrorHandler();
    this.setErrorHandler(fb);
    fb.setAppender(this);
    Appender rootAppen = Logger.getRootLogger().getAppender("RootAppender");

    if (rootAppen != null) {
        fb.setBackupAppender(rootAppen);
    }

    Logger logger = Logger.getLogger(LoggingInvocationProcessor.class);
    fb.setLogger(logger);
}
 

/**
 * Constructor
 */
public FallbackAppender() {
    ErrorHandler fb = new FallbackErrorHandler();
    this.setErrorHandler(fb);
    fb.setAppender(this);
    Appender rootAppen = Logger.getRootLogger().getAppender("RootAppender");

    if (rootAppen != null) {
        fb.setBackupAppender(rootAppen);
    }

    Logger logger = Logger.getLogger(LoggingInvocationProcessor.class);
    fb.setLogger(logger);
}
 

/**
 * Constructor
 */
public FailbackAppender() {
    ErrorHandler fb = new FallbackErrorHandler();
    this.setErrorHandler(fb);
    fb.setAppender(this);
    Appender rootAppen = Logger.getRootLogger().getAppender("RootAppender");

    if (rootAppen != null) {
        fb.setBackupAppender(rootAppen);
    }

    Logger logger = Logger.getLogger(LoggingInvocationProcessor.class);
    fb.setLogger(logger);
}
 

/**
    Used internally to parse an {@link ErrorHandler} element.
  */
 protected
 void parseErrorHandler(Element element, Appender appender) {
   ErrorHandler eh = (ErrorHandler) OptionConverter.instantiateByClassName(
                                      subst(element.getAttribute(CLASS_ATTR)),
                                      org.apache.log4j.spi.ErrorHandler.class, 
				       null);
   
   if(eh != null) {
     eh.setAppender(appender);

     PropertySetter propSetter = new PropertySetter(eh);
     NodeList children = element.getChildNodes();
     final int length 	= children.getLength();

     for (int loop = 0; loop < length; loop++) {
Node currentNode = children.item(loop);
if (currentNode.getNodeType() == Node.ELEMENT_NODE) {
  Element currentElement = (Element) currentNode;
  String tagName = currentElement.getTagName();
  if(tagName.equals(PARAM_TAG)) {
           setParameter(currentElement, propSetter);
  } else if(tagName.equals(APPENDER_REF_TAG)) {
    eh.setBackupAppender(findAppenderByReference(currentElement));
  } else if(tagName.equals(LOGGER_REF)) {
    String loggerName = currentElement.getAttribute(REF_ATTR);	    
    Logger logger = (catFactory == null) ? repository.getLogger(loggerName)
               : repository.getLogger(loggerName, catFactory);
    eh.setLogger(logger);
  } else if(tagName.equals(ROOT_REF)) {
    Logger root = repository.getRootLogger();
    eh.setLogger(root);
  } else {
         quietParseUnrecognizedElement(eh, currentElement, props);
     }
}
     }
     propSetter.activate();
     appender.setErrorHandler(eh);
   }
 }