001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements. See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache license, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License. You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the license for the specific language governing permissions and
015     * limitations under the license.
016     */
017    package org.apache.logging.log4j.core;
018    
019    /**
020     * Appenders may delegate their error handling to <code>ErrorHandlers</code>.
021     * TODO if the appender interface is simplified, then error handling could just be done by wrapping
022     *  a nested appender. (RG) Please look at DefaultErrorHandler. It's purpose is to make sure the console
023     * or error log isn't flooded with messages. I'm still considering the Appender refactoring.
024     */
025    public interface ErrorHandler {
026    
027        /**
028         * Handle an error with a message.
029         * @param msg The message.
030         */
031        void error(String msg);
032    
033        /**
034         * Handle an error with a message and an exception.
035         * @param msg The message.
036         * @param t The Throwable.
037         */
038        void error(String msg, Throwable t);
039    
040        /**
041         * Handle an error with a message, and exception and a logging event.
042         * @param msg The message.
043         * @param event The LogEvent.
044         * @param t The Throwable.
045         */
046        void error(String msg, LogEvent event, Throwable t);
047    }