    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    }