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 018package org.apache.log4j.spi; 019 020import org.apache.log4j.Appender; 021import org.apache.log4j.Category; 022 023/** 024 Listen to events occuring within a {@link 025 org.apache.log4j.Hierarchy Hierarchy}. 026 027 @author Ceki Gülcü 028 @since 1.2 029 030 */ 031public interface HierarchyEventListener { 032 033 034 //public 035 //void categoryCreationEvent(Category cat); 036 037 038 public 039 void addAppenderEvent(Category cat, Appender appender); 040 041 public 042 void removeAppenderEvent(Category cat, Appender appender); 043 044 045}