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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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