| /* |
| * 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.spi; |
| |
| import org.apache.log4j.Appender; |
| import org.apache.log4j.Logger; |
| |
| |
| /** |
| * Interface used to listen for Logger related events such as |
| * add/remove appender or changing levels. Clients register an instance of |
| * the interface and the instance is called back when the various events occur. |
| * <p> |
| * LoggerRepository provides methods for adding and removing |
| * LoggerEventListener instances. |
| * <p> |
| * When implementing the methods of this interface, it is useful to remember |
| * that the Logger can access the repository using its getRepository() |
| * method. |
| * |
| * @author Ceki Gülcü |
| * @author Mark Womack |
| */ |
| public interface LoggerEventListener { |
| /** |
| * Called when an appender is added to the logger. |
| * |
| * @param logger The logger to which the appender was added. |
| * @param appender The appender added to the logger. |
| */ |
| void appenderAddedEvent(Logger logger, Appender appender); |
| |
| /** |
| * Called when an appender is removed from the logger. |
| * |
| * @param logger The logger from which the appender was removed. |
| * @param appender The appender removed from the logger. |
| */ |
| void appenderRemovedEvent(Logger logger, Appender appender); |
| |
| /** |
| * Called when level changed on the logger. |
| * |
| * @param logger The logger that changed levels. |
| */ |
| void levelChangedEvent(Logger logger); |
| } |