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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
package org.apache.log4j.varia;

import  org.apache.log4j.spi.ErrorHandler;
import  org.apache.log4j.spi.LoggingEvent;
import  org.apache.log4j.Appender;
import  org.apache.log4j.Logger;
import  org.apache.log4j.helpers.LogLog;
import java.util.Vector;
import java.io.InterruptedIOException;

/**
  *
  * The FallbackErrorHandler implements the ErrorHandler
  * interface such that a secondary appender may be specified.  This
  * secondary appender takes over if the primary appender fails for
  * whatever reason.
  *
  * 

The error message is printed on System.err, and * logged in the new secondary appender. * * @author Ceki Gücü * */ public class FallbackErrorHandler implements ErrorHandler { Appender backup; Appender primary; Vector loggers; public FallbackErrorHandler() { } /** Adds the logger passed as parameter to the list of loggers that we need to search for in case of appender failure. */ public void setLogger(Logger logger) { LogLog.debug("FB: Adding logger [" + logger.getName() + "]."); if(loggers == null) { loggers = new Vector(); } loggers.addElement(logger); } /** No options to activate. */ public void activateOptions() { } /** Prints the message and the stack trace of the exception on System.err. */ public void error(String message, Exception e, int errorCode) { error(message, e, errorCode, null); } /** Prints the message and the stack trace of the exception on System.err. */ public void error(String message, Exception e, int errorCode, LoggingEvent event) { if (e instanceof InterruptedIOException) { Thread.currentThread().interrupt(); } LogLog.debug("FB: The following error reported: " + message, e); LogLog.debug("FB: INITIATING FALLBACK PROCEDURE."); if (loggers != null) { for(int i = 0; i < loggers.size(); i++) { Logger l = (Logger) loggers.elementAt(i); LogLog.debug("FB: Searching for ["+primary.getName()+"] in logger [" +l.getName() + "]."); LogLog.debug("FB: Replacing ["+primary.getName()+"] by [" + backup.getName() + "] in logger ["+ l.getName() +"]."); l.removeAppender(primary); LogLog.debug("FB: Adding appender ["+backup.getName()+"] to logger " + l.getName()); l.addAppender(backup); } } } /** Print a the error message passed as parameter on System.err. */ public void error(String message) { //if(firstTime) { //LogLog.error(message); //firstTime = false; //} } /** The appender to which this error handler is attached. */ public void setAppender(Appender primary) { LogLog.debug("FB: Setting primary appender to [" + primary.getName() + "]."); this.primary = primary; } /** Set the backup appender. */ public void setBackupAppender(Appender backup) { LogLog.debug("FB: Setting backup appender to [" + backup.getName() + "]."); this.backup = backup; } }





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