001/*
002 * Copyright 2001-2004 The Apache Software Foundation.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.apache.log4j.spi;
018
019import org.apache.log4j.*;
020
021/**
022   Listen to events occurring within a {@link
023   org.apache.log4j.Hierarchy Hierarchy}.
024
025   @author Ceki Gülcü
026   @since 1.2
027
028 */
029public interface HierarchyEventListener {
030
031    // public
032    // void categoryCreationEvent(Category cat);
033
034    public void addAppenderEvent(Category cat, Appender appender);
035
036    public void removeAppenderEvent(Category cat, Appender appender);
037
038}